ALL

If you could go back in time 75 years and tell Dr. Sidney Farber, the developer of methotrexate for cancer therapy, that 21st-century medicine would utilize his specially designed drug more in rheumatology than oncology, he might be surprised. He might scratch his head even more, hearing of his drug sparking interest in still other medical fields, like cardiology.

But drug repurposing is not so uncommon. One classic example is aspirin. Once the most common pain medication and used also in rheumatology, aspirin now finds a range of applications, from colorectal cancer to the prevention of cardiovascular and cerebrovascular thrombosis. Minoxidil is another example, developed for hypertension but used today mostly to stop hair loss. Perhaps most ironic is thalidomide, utilized today for leprosy and multiple myeloma, yet actually contraindicated for its original application, nausea of pregnancy.

Courtesy NIH

Methotrexate, thus, has much in common with other medical treatments, and yet its origin story is as unique and as fascinating as the story of Dr. Farber himself. While this is a rheumatology article, it’s also a story about the origin of a particular rheumatologic treatment, and so the story of that origin will take us mostly through a discussion of hematologic malignancy and of the clinical researcher who dared search for a cure.

Born in 1903, in Buffalo, New York, third of fourteen children of Jewish immigrants from Poland, Dr. Farber grew up in a household that was crowded but academically rigorous. His father, Simon, routinely brought home textbooks, assigning each child a book to read and on which to write a report. His mother, Matilda, was as devoted as her husband to raising the children to succeed in their adopted new country. Upstairs, the children were permitted to speak Yiddish, but downstairs they were required to use only English and German.

As a teen, Dr. Farber lived through the 1918 influenza pandemic that killed at least 50 million people worldwide, including more than 2,000 Buffalonians. This probably helped motivate him to study medicine, but with antisemitism overt in the America of the early 1920s, securing admission to a U.S. medical school was close to impossible. So, in what now seems like the greatest of ironies, Dr. Farber began medical studies in Germany, then transferred for the second year to a U.S. program that seemed adequate – Harvard Medical School, from which he graduated in 1927. From there, he trained as a pathologist, focusing ultimately on pediatric pathology. But, frustrated by case after case of malignancy, whose young victims he’d often have to autopsy, Dr. Farber decided that he wanted to advance the pitiful state of cancer therapeutics, especially for hematologic malignancy.

This was a tall order in the 1930s and early 1940s, when cancer therapeutics consisted only of surgical resection and very primitive forms of radiation therapy. Applicable only to neoplasia that was localized, these options were useless against malignancies in the blood, like acute lymphoblastic leukemia (ALL), but by January 1948 there was at least one glimmer of hope. At that time, one patient with ALL, 2-year-old Robert Sandler, was too ill to join his twin brother Elliott for snow play outside their home in the Dorchester section of Boston. Diagnosed back in August, Robert had suffered multiple episodes of fever, anemia, and thrombocytopenia. His illness had enlarged his spleen dramatically and caused pathologic bone fractures with excruciating bone pain, and for a while he couldn’t walk because of pressure on his lower spinal cord. All of this was the result of uncontrolled mitosis and cell division of lymphoblasts, immature lymphocytes. By December, these out-of-control cells had elevated the boy’s white blood cell count to a peak of 70,000/mcL, more than six times the high end of the normal range (4,500-11,000/mcL). This had happened despite treatment with an experimental drug, developed at Boston Children’s Hospital by Dr. Farber and his team, working on the assumption that inhibition of folate metabolism should slow the growth of tumor cells. On Dec. 28, however, Dr. Farber had switched the child to a new drug with a chemical structure just slightly different from the other agent’s.

Merely another chemical modification in a series of attempts by the research team, the new drug, aminopterin, was not expected to do anything dramatic, but Dr. Farber and the team had come such a long way since the middle of 1947, when he’d actually done the opposite of what he was doing now. On the basis of British research from India showing folic acid deficiency as the basis of a common type of anemia in malnourished people, Dr. Farber had reasoned that children with leukemia, who also suffered from anemia, might also benefit from folic acid supplementation. Even without prior rodent testing, Dr. Farber had tried giving the nutrient to patients with ALL, a strategy made possible by the presence of a spectacular chemist working on folic acid synthesis at Farber’s own hospital to help combat folate deficiency. Born into a poor Brahmin family in India, the chemist, Dr. Yellapragada SubbaRow, had begun life with so much stacked against him as to appear even less likely during childhood than the young Dr. Farber to grow up to make major contributions to medicine. Going through childhood with death all around him, Dr. SubbaRow was motivated to study medicine, but getting into medical school had been an uphill fight, given his family’s economic difficulty. Knowing that he’d also face discrimination on account of his low status after receiving admission to a medical program, SubbaRow could have made things a bit easier for himself by living within the norms of the British Imperial system, but as a supporter of Mohandas Gandhi’s nationalist movement, he boycotted British goods. As a medical student, this meant doing things like wearing Indian-made surgical gloves, instead of the English products that were expected of the students. Such actions led Dr. SubbaRow to receive a kind of second-rate medical degree, rather than the prestigious MBBS.

The political situation also led Dr. SubbaRow to emigrate to the United States, where, ironically, his medical degree initially was taken less seriously than it had been taken in his British-occupied homeland. He thus worked in the capacity of a hospital night porter at Peter Bent Brigham Hospital (the future Brigham and Women’s Hospital), doing menial tasks like changing sheets to make ends meet. He studied, however, and made enough of an impression to gain admission to the same institution that also admitted Farber through the backdoor, Harvard Medical School. This launched him into a research career in which he not only would be instrumental in developing folate antagonists and other classes of drugs, but also would make him the codiscoverer of the role of creatine phosphate and ATP in cellular energy metabolism. Sadly, even after obtaining his top-notch American credentials and contributing through his research to what you might say is a good chunk of the biochemistry pathways that first year medical students memorize without ever learning who discovered them, Dr. SubbaRow still faced prejudice for the rest of his life, which turned out to last only until the age of 53. To add insult to injury, he is rarely remembered for his role.

Dr. Farber proceeded with the folic acid supplementation idea in patients with ALL, even though ALL caused a hypoproliferative anemia, whereas anemia from folate deficiency was megaloblastic, meaning that erythrocytes were produced but they were oversized and dysfunctional. Tragically, folic acid had accelerated the disease process in children with ALL, but the process of chemical experimentation aimed at synthesizing folate also produced some compounds that mimicked chemical precursors of folate in a way that made them antifolates, inhibitors of folate metabolism. If folic acid made lymphoblasts grow faster, Dr. Farber had reasoned that antifolates should inhibit their growth. He thus asked the chemistry lab to focus on folate inhibitors. Testing aminopterin, beginning with young Robert Sandler at the end of December, is what proved his hypothesis correct. By late January, aminopterin had brought the child’s WBC count down to the realm of 12,000, just slightly above normal, with symptoms and signs abating as well, and by February, the child could play with his twin brother. It was not a cure; malignant lymphoblasts still showed on microscopy of Robert’s blood. While he and some 15 other children whom Dr. Farber treated in this early trial would all succumb to ALL, they experienced remission lasting several months.

This was a big deal because the concept of chemotherapy was based only on serendipitous observations of WBC counts dropping in soldiers exposed to nitrogen mustard gas during World War I and during an incident in World War II, yet aminopterin had been designed from the ground up. Though difficult to synthesize in quantities, there was no reason for Dr. Farber’s team not to keep tweaking the drug, and so they did. Replacing one hydrogen atom with a methyl group, they turned it into methotrexate.

Proving easier to synthesize and less toxic, methotrexate would become a workhorse for chemotherapy over the next couple of decades, but the capability of both methotrexate and aminopterin to blunt the growth of white blood cells and other cells did not go unnoticed outside the realm of oncology. As early as the 1950s, dermatologists were using aminopterin to treat psoriasis. This led to the approval of methotrexate for psoriasis in 1972.

Meanwhile, like oncology, infectious diseases, aviation medicine, and so many other areas of practice, rheumatology had gotten a major boost from research stemming from World War II. During the war, Dr. Philip Hench of the Mayo Clinic developed cortisone, which pilots used to stay alert and energetic during trans-Atlantic flights. But it turned out that cortisone had a powerful immunosuppressive effect that dramatically improved rheumatoid arthritis, leading Dr. Hench to receive the Nobel Prize in Physiology or Medicine in 1950. By the end of the 1950s, however, the significant side effects of long-term corticosteroid therapy were very clear, so over the next few decades there was a major effort to develop different treatments for RA and other rheumatologic diseases.

Top on the list of such agents was methotrexate, developed for RA in part by Dr. Michael Weinblatt of Brigham and Women’s Hospital in Boston. In the 1980s, Dr. Weinblatt published the first clinical trial showing the benefits of methotrexate for RA patients. This has since developed into a standard treatment, noticeably different from the original malignancy application in that it is a low-dose regimen. Patients taking methotrexate for RA typically receive no more than 25 mg per week orally, and often much less. Rheumatology today includes expertise in keeping long-term methotrexate therapy safe by monitoring liver function and through other routine tests. The routine nature of the therapy has brought methotrexate to the point of beckoning in a realm that Dr. Farber might not have predicted in his wildest imagination: cardiology. This is on account of the growing appreciation of the inflammatory process in the pathophysiology of atherosclerotic heart disease.

Meanwhile, being an antimetabolite, harmful to rapidly dividing cells, the danger of methotrexate to the embryo and fetus was recognized early. This made methotrexate off-limits to pregnant women, yet it also has made the drug useful as an abortifacient. Though not as good for medication abortion in unwanted but thriving pregnancies, where mifepristone/misoprostol has become the regimen of choice, methotrexate has become a workhorse in other obstetrical settings, such as for ending ectopic pregnancy.

Looking at the present and into the future, the potential for this very old medication looks wide open, as if it could go in any direction, so let’s wind up the discussion with the thought that we may be in for some surprises. Rather than jumping deeply into any rheumatologic issue, we spent most of this article weaving through other medical issues, but does this not make today’s story fairly analogous to rheumatology itself?

Dr. Warmflash is a physician from Portland, Ore. He reported no conflicts of interest.

This story was updated 2/10/2023.

A version of this article first appeared on Medscape.com.

If you could go back in time 75 years and tell Dr. Sidney Farber, the developer of methotrexate for cancer therapy, that 21st-century medicine would utilize his specially designed drug more in rheumatology than oncology, he might be surprised. He might scratch his head even more, hearing of his drug sparking interest in still other medical fields, like cardiology.

But drug repurposing is not so uncommon. One classic example is aspirin. Once the most common pain medication and used also in rheumatology, aspirin now finds a range of applications, from colorectal cancer to the prevention of cardiovascular and cerebrovascular thrombosis. Minoxidil is another example, developed for hypertension but used today mostly to stop hair loss. Perhaps most ironic is thalidomide, utilized today for leprosy and multiple myeloma, yet actually contraindicated for its original application, nausea of pregnancy.

Courtesy NIH

Methotrexate, thus, has much in common with other medical treatments, and yet its origin story is as unique and as fascinating as the story of Dr. Farber himself. While this is a rheumatology article, it’s also a story about the origin of a particular rheumatologic treatment, and so the story of that origin will take us mostly through a discussion of hematologic malignancy and of the clinical researcher who dared search for a cure.

Born in 1903, in Buffalo, New York, third of fourteen children of Jewish immigrants from Poland, Dr. Farber grew up in a household that was crowded but academically rigorous. His father, Simon, routinely brought home textbooks, assigning each child a book to read and on which to write a report. His mother, Matilda, was as devoted as her husband to raising the children to succeed in their adopted new country. Upstairs, the children were permitted to speak Yiddish, but downstairs they were required to use only English and German.

As a teen, Dr. Farber lived through the 1918 influenza pandemic that killed at least 50 million people worldwide, including more than 2,000 Buffalonians. This probably helped motivate him to study medicine, but with antisemitism overt in the America of the early 1920s, securing admission to a U.S. medical school was close to impossible. So, in what now seems like the greatest of ironies, Dr. Farber began medical studies in Germany, then transferred for the second year to a U.S. program that seemed adequate – Harvard Medical School, from which he graduated in 1927. From there, he trained as a pathologist, focusing ultimately on pediatric pathology. But, frustrated by case after case of malignancy, whose young victims he’d often have to autopsy, Dr. Farber decided that he wanted to advance the pitiful state of cancer therapeutics, especially for hematologic malignancy.

This was a tall order in the 1930s and early 1940s, when cancer therapeutics consisted only of surgical resection and very primitive forms of radiation therapy. Applicable only to neoplasia that was localized, these options were useless against malignancies in the blood, like acute lymphoblastic leukemia (ALL), but by January 1948 there was at least one glimmer of hope. At that time, one patient with ALL, 2-year-old Robert Sandler, was too ill to join his twin brother Elliott for snow play outside their home in the Dorchester section of Boston. Diagnosed back in August, Robert had suffered multiple episodes of fever, anemia, and thrombocytopenia. His illness had enlarged his spleen dramatically and caused pathologic bone fractures with excruciating bone pain, and for a while he couldn’t walk because of pressure on his lower spinal cord. All of this was the result of uncontrolled mitosis and cell division of lymphoblasts, immature lymphocytes. By December, these out-of-control cells had elevated the boy’s white blood cell count to a peak of 70,000/mcL, more than six times the high end of the normal range (4,500-11,000/mcL). This had happened despite treatment with an experimental drug, developed at Boston Children’s Hospital by Dr. Farber and his team, working on the assumption that inhibition of folate metabolism should slow the growth of tumor cells. On Dec. 28, however, Dr. Farber had switched the child to a new drug with a chemical structure just slightly different from the other agent’s.

Merely another chemical modification in a series of attempts by the research team, the new drug, aminopterin, was not expected to do anything dramatic, but Dr. Farber and the team had come such a long way since the middle of 1947, when he’d actually done the opposite of what he was doing now. On the basis of British research from India showing folic acid deficiency as the basis of a common type of anemia in malnourished people, Dr. Farber had reasoned that children with leukemia, who also suffered from anemia, might also benefit from folic acid supplementation. Even without prior rodent testing, Dr. Farber had tried giving the nutrient to patients with ALL, a strategy made possible by the presence of a spectacular chemist working on folic acid synthesis at Farber’s own hospital to help combat folate deficiency. Born into a poor Brahmin family in India, the chemist, Dr. Yellapragada SubbaRow, had begun life with so much stacked against him as to appear even less likely during childhood than the young Dr. Farber to grow up to make major contributions to medicine. Going through childhood with death all around him, Dr. SubbaRow was motivated to study medicine, but getting into medical school had been an uphill fight, given his family’s economic difficulty. Knowing that he’d also face discrimination on account of his low status after receiving admission to a medical program, SubbaRow could have made things a bit easier for himself by living within the norms of the British Imperial system, but as a supporter of Mohandas Gandhi’s nationalist movement, he boycotted British goods. As a medical student, this meant doing things like wearing Indian-made surgical gloves, instead of the English products that were expected of the students. Such actions led Dr. SubbaRow to receive a kind of second-rate medical degree, rather than the prestigious MBBS.

The political situation also led Dr. SubbaRow to emigrate to the United States, where, ironically, his medical degree initially was taken less seriously than it had been taken in his British-occupied homeland. He thus worked in the capacity of a hospital night porter at Peter Bent Brigham Hospital (the future Brigham and Women’s Hospital), doing menial tasks like changing sheets to make ends meet. He studied, however, and made enough of an impression to gain admission to the same institution that also admitted Farber through the backdoor, Harvard Medical School. This launched him into a research career in which he not only would be instrumental in developing folate antagonists and other classes of drugs, but also would make him the codiscoverer of the role of creatine phosphate and ATP in cellular energy metabolism. Sadly, even after obtaining his top-notch American credentials and contributing through his research to what you might say is a good chunk of the biochemistry pathways that first year medical students memorize without ever learning who discovered them, Dr. SubbaRow still faced prejudice for the rest of his life, which turned out to last only until the age of 53. To add insult to injury, he is rarely remembered for his role.

Dr. Farber proceeded with the folic acid supplementation idea in patients with ALL, even though ALL caused a hypoproliferative anemia, whereas anemia from folate deficiency was megaloblastic, meaning that erythrocytes were produced but they were oversized and dysfunctional. Tragically, folic acid had accelerated the disease process in children with ALL, but the process of chemical experimentation aimed at synthesizing folate also produced some compounds that mimicked chemical precursors of folate in a way that made them antifolates, inhibitors of folate metabolism. If folic acid made lymphoblasts grow faster, Dr. Farber had reasoned that antifolates should inhibit their growth. He thus asked the chemistry lab to focus on folate inhibitors. Testing aminopterin, beginning with young Robert Sandler at the end of December, is what proved his hypothesis correct. By late January, aminopterin had brought the child’s WBC count down to the realm of 12,000, just slightly above normal, with symptoms and signs abating as well, and by February, the child could play with his twin brother. It was not a cure; malignant lymphoblasts still showed on microscopy of Robert’s blood. While he and some 15 other children whom Dr. Farber treated in this early trial would all succumb to ALL, they experienced remission lasting several months.

This was a big deal because the concept of chemotherapy was based only on serendipitous observations of WBC counts dropping in soldiers exposed to nitrogen mustard gas during World War I and during an incident in World War II, yet aminopterin had been designed from the ground up. Though difficult to synthesize in quantities, there was no reason for Dr. Farber’s team not to keep tweaking the drug, and so they did. Replacing one hydrogen atom with a methyl group, they turned it into methotrexate.

Proving easier to synthesize and less toxic, methotrexate would become a workhorse for chemotherapy over the next couple of decades, but the capability of both methotrexate and aminopterin to blunt the growth of white blood cells and other cells did not go unnoticed outside the realm of oncology. As early as the 1950s, dermatologists were using aminopterin to treat psoriasis. This led to the approval of methotrexate for psoriasis in 1972.

Meanwhile, like oncology, infectious diseases, aviation medicine, and so many other areas of practice, rheumatology had gotten a major boost from research stemming from World War II. During the war, Dr. Philip Hench of the Mayo Clinic developed cortisone, which pilots used to stay alert and energetic during trans-Atlantic flights. But it turned out that cortisone had a powerful immunosuppressive effect that dramatically improved rheumatoid arthritis, leading Dr. Hench to receive the Nobel Prize in Physiology or Medicine in 1950. By the end of the 1950s, however, the significant side effects of long-term corticosteroid therapy were very clear, so over the next few decades there was a major effort to develop different treatments for RA and other rheumatologic diseases.

Top on the list of such agents was methotrexate, developed for RA in part by Dr. Michael Weinblatt of Brigham and Women’s Hospital in Boston. In the 1980s, Dr. Weinblatt published the first clinical trial showing the benefits of methotrexate for RA patients. This has since developed into a standard treatment, noticeably different from the original malignancy application in that it is a low-dose regimen. Patients taking methotrexate for RA typically receive no more than 25 mg per week orally, and often much less. Rheumatology today includes expertise in keeping long-term methotrexate therapy safe by monitoring liver function and through other routine tests. The routine nature of the therapy has brought methotrexate to the point of beckoning in a realm that Dr. Farber might not have predicted in his wildest imagination: cardiology. This is on account of the growing appreciation of the inflammatory process in the pathophysiology of atherosclerotic heart disease.

Meanwhile, being an antimetabolite, harmful to rapidly dividing cells, the danger of methotrexate to the embryo and fetus was recognized early. This made methotrexate off-limits to pregnant women, yet it also has made the drug useful as an abortifacient. Though not as good for medication abortion in unwanted but thriving pregnancies, where mifepristone/misoprostol has become the regimen of choice, methotrexate has become a workhorse in other obstetrical settings, such as for ending ectopic pregnancy.

Looking at the present and into the future, the potential for this very old medication looks wide open, as if it could go in any direction, so let’s wind up the discussion with the thought that we may be in for some surprises. Rather than jumping deeply into any rheumatologic issue, we spent most of this article weaving through other medical issues, but does this not make today’s story fairly analogous to rheumatology itself?

Dr. Warmflash is a physician from Portland, Ore. He reported no conflicts of interest.

This story was updated 2/10/2023.

A version of this article first appeared on Medscape.com.

If you could go back in time 75 years and tell Dr. Sidney Farber, the developer of methotrexate for cancer therapy, that 21st-century medicine would utilize his specially designed drug more in rheumatology than oncology, he might be surprised. He might scratch his head even more, hearing of his drug sparking interest in still other medical fields, like cardiology.

But drug repurposing is not so uncommon. One classic example is aspirin. Once the most common pain medication and used also in rheumatology, aspirin now finds a range of applications, from colorectal cancer to the prevention of cardiovascular and cerebrovascular thrombosis. Minoxidil is another example, developed for hypertension but used today mostly to stop hair loss. Perhaps most ironic is thalidomide, utilized today for leprosy and multiple myeloma, yet actually contraindicated for its original application, nausea of pregnancy.

Courtesy NIH

Methotrexate, thus, has much in common with other medical treatments, and yet its origin story is as unique and as fascinating as the story of Dr. Farber himself. While this is a rheumatology article, it’s also a story about the origin of a particular rheumatologic treatment, and so the story of that origin will take us mostly through a discussion of hematologic malignancy and of the clinical researcher who dared search for a cure.

Born in 1903, in Buffalo, New York, third of fourteen children of Jewish immigrants from Poland, Dr. Farber grew up in a household that was crowded but academically rigorous. His father, Simon, routinely brought home textbooks, assigning each child a book to read and on which to write a report. His mother, Matilda, was as devoted as her husband to raising the children to succeed in their adopted new country. Upstairs, the children were permitted to speak Yiddish, but downstairs they were required to use only English and German.

As a teen, Dr. Farber lived through the 1918 influenza pandemic that killed at least 50 million people worldwide, including more than 2,000 Buffalonians. This probably helped motivate him to study medicine, but with antisemitism overt in the America of the early 1920s, securing admission to a U.S. medical school was close to impossible. So, in what now seems like the greatest of ironies, Dr. Farber began medical studies in Germany, then transferred for the second year to a U.S. program that seemed adequate – Harvard Medical School, from which he graduated in 1927. From there, he trained as a pathologist, focusing ultimately on pediatric pathology. But, frustrated by case after case of malignancy, whose young victims he’d often have to autopsy, Dr. Farber decided that he wanted to advance the pitiful state of cancer therapeutics, especially for hematologic malignancy.

This was a tall order in the 1930s and early 1940s, when cancer therapeutics consisted only of surgical resection and very primitive forms of radiation therapy. Applicable only to neoplasia that was localized, these options were useless against malignancies in the blood, like acute lymphoblastic leukemia (ALL), but by January 1948 there was at least one glimmer of hope. At that time, one patient with ALL, 2-year-old Robert Sandler, was too ill to join his twin brother Elliott for snow play outside their home in the Dorchester section of Boston. Diagnosed back in August, Robert had suffered multiple episodes of fever, anemia, and thrombocytopenia. His illness had enlarged his spleen dramatically and caused pathologic bone fractures with excruciating bone pain, and for a while he couldn’t walk because of pressure on his lower spinal cord. All of this was the result of uncontrolled mitosis and cell division of lymphoblasts, immature lymphocytes. By December, these out-of-control cells had elevated the boy’s white blood cell count to a peak of 70,000/mcL, more than six times the high end of the normal range (4,500-11,000/mcL). This had happened despite treatment with an experimental drug, developed at Boston Children’s Hospital by Dr. Farber and his team, working on the assumption that inhibition of folate metabolism should slow the growth of tumor cells. On Dec. 28, however, Dr. Farber had switched the child to a new drug with a chemical structure just slightly different from the other agent’s.

Merely another chemical modification in a series of attempts by the research team, the new drug, aminopterin, was not expected to do anything dramatic, but Dr. Farber and the team had come such a long way since the middle of 1947, when he’d actually done the opposite of what he was doing now. On the basis of British research from India showing folic acid deficiency as the basis of a common type of anemia in malnourished people, Dr. Farber had reasoned that children with leukemia, who also suffered from anemia, might also benefit from folic acid supplementation. Even without prior rodent testing, Dr. Farber had tried giving the nutrient to patients with ALL, a strategy made possible by the presence of a spectacular chemist working on folic acid synthesis at Farber’s own hospital to help combat folate deficiency. Born into a poor Brahmin family in India, the chemist, Dr. Yellapragada SubbaRow, had begun life with so much stacked against him as to appear even less likely during childhood than the young Dr. Farber to grow up to make major contributions to medicine. Going through childhood with death all around him, Dr. SubbaRow was motivated to study medicine, but getting into medical school had been an uphill fight, given his family’s economic difficulty. Knowing that he’d also face discrimination on account of his low status after receiving admission to a medical program, SubbaRow could have made things a bit easier for himself by living within the norms of the British Imperial system, but as a supporter of Mohandas Gandhi’s nationalist movement, he boycotted British goods. As a medical student, this meant doing things like wearing Indian-made surgical gloves, instead of the English products that were expected of the students. Such actions led Dr. SubbaRow to receive a kind of second-rate medical degree, rather than the prestigious MBBS.

The political situation also led Dr. SubbaRow to emigrate to the United States, where, ironically, his medical degree initially was taken less seriously than it had been taken in his British-occupied homeland. He thus worked in the capacity of a hospital night porter at Peter Bent Brigham Hospital (the future Brigham and Women’s Hospital), doing menial tasks like changing sheets to make ends meet. He studied, however, and made enough of an impression to gain admission to the same institution that also admitted Farber through the backdoor, Harvard Medical School. This launched him into a research career in which he not only would be instrumental in developing folate antagonists and other classes of drugs, but also would make him the codiscoverer of the role of creatine phosphate and ATP in cellular energy metabolism. Sadly, even after obtaining his top-notch American credentials and contributing through his research to what you might say is a good chunk of the biochemistry pathways that first year medical students memorize without ever learning who discovered them, Dr. SubbaRow still faced prejudice for the rest of his life, which turned out to last only until the age of 53. To add insult to injury, he is rarely remembered for his role.

Dr. Farber proceeded with the folic acid supplementation idea in patients with ALL, even though ALL caused a hypoproliferative anemia, whereas anemia from folate deficiency was megaloblastic, meaning that erythrocytes were produced but they were oversized and dysfunctional. Tragically, folic acid had accelerated the disease process in children with ALL, but the process of chemical experimentation aimed at synthesizing folate also produced some compounds that mimicked chemical precursors of folate in a way that made them antifolates, inhibitors of folate metabolism. If folic acid made lymphoblasts grow faster, Dr. Farber had reasoned that antifolates should inhibit their growth. He thus asked the chemistry lab to focus on folate inhibitors. Testing aminopterin, beginning with young Robert Sandler at the end of December, is what proved his hypothesis correct. By late January, aminopterin had brought the child’s WBC count down to the realm of 12,000, just slightly above normal, with symptoms and signs abating as well, and by February, the child could play with his twin brother. It was not a cure; malignant lymphoblasts still showed on microscopy of Robert’s blood. While he and some 15 other children whom Dr. Farber treated in this early trial would all succumb to ALL, they experienced remission lasting several months.

This was a big deal because the concept of chemotherapy was based only on serendipitous observations of WBC counts dropping in soldiers exposed to nitrogen mustard gas during World War I and during an incident in World War II, yet aminopterin had been designed from the ground up. Though difficult to synthesize in quantities, there was no reason for Dr. Farber’s team not to keep tweaking the drug, and so they did. Replacing one hydrogen atom with a methyl group, they turned it into methotrexate.

Proving easier to synthesize and less toxic, methotrexate would become a workhorse for chemotherapy over the next couple of decades, but the capability of both methotrexate and aminopterin to blunt the growth of white blood cells and other cells did not go unnoticed outside the realm of oncology. As early as the 1950s, dermatologists were using aminopterin to treat psoriasis. This led to the approval of methotrexate for psoriasis in 1972.

Meanwhile, like oncology, infectious diseases, aviation medicine, and so many other areas of practice, rheumatology had gotten a major boost from research stemming from World War II. During the war, Dr. Philip Hench of the Mayo Clinic developed cortisone, which pilots used to stay alert and energetic during trans-Atlantic flights. But it turned out that cortisone had a powerful immunosuppressive effect that dramatically improved rheumatoid arthritis, leading Dr. Hench to receive the Nobel Prize in Physiology or Medicine in 1950. By the end of the 1950s, however, the significant side effects of long-term corticosteroid therapy were very clear, so over the next few decades there was a major effort to develop different treatments for RA and other rheumatologic diseases.

Top on the list of such agents was methotrexate, developed for RA in part by Dr. Michael Weinblatt of Brigham and Women’s Hospital in Boston. In the 1980s, Dr. Weinblatt published the first clinical trial showing the benefits of methotrexate for RA patients. This has since developed into a standard treatment, noticeably different from the original malignancy application in that it is a low-dose regimen. Patients taking methotrexate for RA typically receive no more than 25 mg per week orally, and often much less. Rheumatology today includes expertise in keeping long-term methotrexate therapy safe by monitoring liver function and through other routine tests. The routine nature of the therapy has brought methotrexate to the point of beckoning in a realm that Dr. Farber might not have predicted in his wildest imagination: cardiology. This is on account of the growing appreciation of the inflammatory process in the pathophysiology of atherosclerotic heart disease.

Meanwhile, being an antimetabolite, harmful to rapidly dividing cells, the danger of methotrexate to the embryo and fetus was recognized early. This made methotrexate off-limits to pregnant women, yet it also has made the drug useful as an abortifacient. Though not as good for medication abortion in unwanted but thriving pregnancies, where mifepristone/misoprostol has become the regimen of choice, methotrexate has become a workhorse in other obstetrical settings, such as for ending ectopic pregnancy.

Looking at the present and into the future, the potential for this very old medication looks wide open, as if it could go in any direction, so let’s wind up the discussion with the thought that we may be in for some surprises. Rather than jumping deeply into any rheumatologic issue, we spent most of this article weaving through other medical issues, but does this not make today’s story fairly analogous to rheumatology itself?

Dr. Warmflash is a physician from Portland, Ore. He reported no conflicts of interest.

This story was updated 2/10/2023.

A version of this article first appeared on Medscape.com.

Systemic mastocytosis is widely underdiagnosed, and many more hematologic oncologists should be looking for it. This call to action was issued late in 2022 by Stanford (Calif.) Cancer Institute’s Jason Gotlib, MD, speaking at the Lymphoma, Leukemia & Myeloma Congress in New York.

Nationwide, approximately 1,000 adults are diagnosed with systemic mastocytosis annually. This rare disease is a myeloid neoplasm with a highly variable phenotypic expression, in which abnormal mast cells proliferate and infiltrate organs and tissues. It swings widely from a nonadvanced form, composed of indolent or smoldering disease, to advanced disease that progresses to leukemia in 6% of cases.

More than 80% of systemic mastocytosis is driven by the KIT D816V mutation. Along with a host of other rare KIT mutations, KIT D816V activates KIT-receptor tyrosine kinase to trigger mast cell proliferation.

Dr. Gotlib could not be contacted for an interview. However, there are many good reasons to identify patients with systemic mastocytosis, according to Attilio Orazi, MD, professor and chair of the department of pathology at Texas Tech University, El Paso. The chief reason is that the patient may be in grave peril.

“The degree of heterogeneity is amazing. ... There’s very indolent [disease], which is really not a big deal. And then you have a disease in which you’re dead in 3 months,” Dr. Orazi said. “So you run the gamut between an indolent, no-problem cutaneous disease to a very nasty systemic, aggressive leukemia-like neoplasm.”

Since 2001, the diagnosis of mastocytosis has been guided by the World Health Organization Classification of Tumours, or “Blue Book.” In 2022, Dr. Orazi along with 137 other senior experts, most of whom were involved in past editions of the Blue Book, published their own version: The International Consensus Classification of Myeloid Neoplasms and Acute Leukemias (the ICC 2022).

In September 2021, this group of specialists held a virtual/in-person advisory committee meeting at the University of Chicago to create the document. One factor in their decision to go it alone, Dr. Orazi said, was that WHO decided to proceed with the fifth edition of the Blue Book using its own internal editorial group without convening an advisory committee, despite repeated requests to do so.

ICC 2022 divides advanced systemic mastocytosis into three subtypes: aggressive systemic mastocytosis (ASM), systemic mastocytosis with an associated hematologic neoplasm (SM-AHN), and mast cell leukemia (MCL). Median survival is 3.5 years for patients with ASM, 2 years for those with SM-AHN and as low as 2 months for MCL.

The second key reason to increase awareness of mastocytosis among physicians, said Dr. Orazi, is that patients falling through the net are likely to be ambulatory, and their presentation can be “a little confusing.”

Patients with indolent disease are relatively straightforward to recognize, explained Dr. Orazi. Similarly, very sick patients with SM-AHN or MCL are easily recognized by hem-oncs.

“But if you see a patient in an ambulatory setting, in your clinic or whatever, and you’re suspicious, then you need to decide [how] you’re going to investigate that patient further,” he said, Dr. Orazi noted the next step is not always obvious, especially for primary-practice or internal medicine physicians likely to be unfamiliar with such a rare disease.

A practice survey published in 2022 by other researchers backed up Dr. Orazi’s remarks. The study found that community/solo-practice physicians were less likely to have tested systemic mastocytosis patients for KIT816V mutation than academic/specialty physicians (58% vs. 80%; P = .004; n = 111). Clinicians treating these patients estimated that it took an average of 8.5 months for a “typical” patient to receive the diagnosis from the time of symptom onset.

The research was headed by Ruben Mesa, MD, director of University of Texas Health, San Antonio, and funded by Blueprint Medicines, the manufacturer of avapritinib (Ayvakit), a new drug for the disease.

Dr. Orazi urged clinicians to have a high degree of suspicion for mastocytosis in a patient who walks into the clinic with any combination of the following: urticarial-type skin manifestations, especially if persistent into adulthood; history of undue reaction to an insect sting; a big spleen in a patient with a history of cutaneous flushing or rash; chronic diarrhea, especially if a biopsy has shown “too many mast cells” in the lamina propria of the small bowel; and positivity for KIT816V mutation.

Dr. Orazi stressed that the majority of patients will have indolent disease, but for the few patients for whom immediate treatment is essential, “the distinction between indolent and aggressive [disease] is really very, very important.”

Patients with advanced systemic mastocytosis can now be effectively treated, following the arrival of midostaurin (Rydapt, Tauritmo) and avapritinib.

Midostaurin, a multikinase/KIT inhibitor, was approved by the Food and Drug Administration in 2017 for the treatment of advanced systemic mastocytosis (ASM, SM-AHN, and MCL). Avapritinib, a selective kinase inhibitor of KIT816V and platelet-derived growth factor receptor alpha as well as multiple KIT exon 11, 11/17 and 17 mutants, gained the same indication in June 2021.

As with all rare diseases, it is challenging to obtain accurate numbers on how many patients are affected by systemic mastocytosis. The first population-based study of the disorder, presented at the 2018 annual meeting of the American Society of Hematology, used the Surveillance, Epidemiology, and End Results database from 2000 to 2014 to estimate incidence at 0.046 per 10,000, which translates to 1,050 new adult cases per year. The study data have never been published in full.

How many of these cases are advanced disease? There are no U.S. data but extrapolating from a Danish registry study that found 82% of systemic mastocytosis cases to be indolent disease, the incidence of advanced systemic mastocytosis in the United States could be as low as 200 adults a year.

This information, in turn, suggests that identifying more patients with advanced disease would not only benefit those patients but would also benefit clinical trial investigators who are seeking the proverbial needle in the haystack.

Nationwide, five clinical trials are recruiting individuals with advanced systemic mastocytosis, collectively looking for 352 patients in the United States. Two of the studies focus on mast-cell activation (NCT0544944) and cutaneous mastocytoses (NCT04846348). Two trials in a range of hematological malignancies are testing bispecific antibodies flotetuzumab and MGD024 (both from Macrogenics; NCT04681105, NCT05362773).

Apex, a phase 2 study of tyrosine-kinase inhibitor bezuclastinib (a Cogent hopeful), is specifically focusing on advanced disease. Dr. Gotlib and coinvestigators are aiming for 140 participants.

As a pathologist, Dr. Orazi said he find mastocytosis fascinating because he believes he has “a truly useful role,” contrasting with some other hematological diseases in which the molecular profile rules.

“Pathology plays a major role here,” he explained, “because you have to correlate what you see at the microscope with the full clinical picture, selected laboratory tests such as CBC and serum tryptase, and molecular results. You often need integration through a pathologist to put all the pieces together.

“It’s easier to treat once you know exactly what disease you’re dealing with and whether it is an aggressive or indolent subtype,” Dr. Orazi concluded.

Dr. Orazi disclosed no conflicts of interest. Dr. Gotlib has disclosed ties with Blueprint Medicines, Deciphera, Incyte, and Kartos Therapeutics, and has led committees for Blueprint Medicine’s EXPLORER and PATHFINDER studies, Deciphera’s Study Steering Committee for ripretinib in AdvSM, and the Central Response Review Committee for the phase 2 study of bezuclastinib in AdvSM.

Systemic mastocytosis is widely underdiagnosed, and many more hematologic oncologists should be looking for it. This call to action was issued late in 2022 by Stanford (Calif.) Cancer Institute’s Jason Gotlib, MD, speaking at the Lymphoma, Leukemia & Myeloma Congress in New York.

Nationwide, approximately 1,000 adults are diagnosed with systemic mastocytosis annually. This rare disease is a myeloid neoplasm with a highly variable phenotypic expression, in which abnormal mast cells proliferate and infiltrate organs and tissues. It swings widely from a nonadvanced form, composed of indolent or smoldering disease, to advanced disease that progresses to leukemia in 6% of cases.

More than 80% of systemic mastocytosis is driven by the KIT D816V mutation. Along with a host of other rare KIT mutations, KIT D816V activates KIT-receptor tyrosine kinase to trigger mast cell proliferation.

Dr. Gotlib could not be contacted for an interview. However, there are many good reasons to identify patients with systemic mastocytosis, according to Attilio Orazi, MD, professor and chair of the department of pathology at Texas Tech University, El Paso. The chief reason is that the patient may be in grave peril.

“The degree of heterogeneity is amazing. ... There’s very indolent [disease], which is really not a big deal. And then you have a disease in which you’re dead in 3 months,” Dr. Orazi said. “So you run the gamut between an indolent, no-problem cutaneous disease to a very nasty systemic, aggressive leukemia-like neoplasm.”

Since 2001, the diagnosis of mastocytosis has been guided by the World Health Organization Classification of Tumours, or “Blue Book.” In 2022, Dr. Orazi along with 137 other senior experts, most of whom were involved in past editions of the Blue Book, published their own version: The International Consensus Classification of Myeloid Neoplasms and Acute Leukemias (the ICC 2022).

In September 2021, this group of specialists held a virtual/in-person advisory committee meeting at the University of Chicago to create the document. One factor in their decision to go it alone, Dr. Orazi said, was that WHO decided to proceed with the fifth edition of the Blue Book using its own internal editorial group without convening an advisory committee, despite repeated requests to do so.

ICC 2022 divides advanced systemic mastocytosis into three subtypes: aggressive systemic mastocytosis (ASM), systemic mastocytosis with an associated hematologic neoplasm (SM-AHN), and mast cell leukemia (MCL). Median survival is 3.5 years for patients with ASM, 2 years for those with SM-AHN and as low as 2 months for MCL.

The second key reason to increase awareness of mastocytosis among physicians, said Dr. Orazi, is that patients falling through the net are likely to be ambulatory, and their presentation can be “a little confusing.”

Patients with indolent disease are relatively straightforward to recognize, explained Dr. Orazi. Similarly, very sick patients with SM-AHN or MCL are easily recognized by hem-oncs.

“But if you see a patient in an ambulatory setting, in your clinic or whatever, and you’re suspicious, then you need to decide [how] you’re going to investigate that patient further,” he said, Dr. Orazi noted the next step is not always obvious, especially for primary-practice or internal medicine physicians likely to be unfamiliar with such a rare disease.

A practice survey published in 2022 by other researchers backed up Dr. Orazi’s remarks. The study found that community/solo-practice physicians were less likely to have tested systemic mastocytosis patients for KIT816V mutation than academic/specialty physicians (58% vs. 80%; P = .004; n = 111). Clinicians treating these patients estimated that it took an average of 8.5 months for a “typical” patient to receive the diagnosis from the time of symptom onset.

The research was headed by Ruben Mesa, MD, director of University of Texas Health, San Antonio, and funded by Blueprint Medicines, the manufacturer of avapritinib (Ayvakit), a new drug for the disease.

Dr. Orazi urged clinicians to have a high degree of suspicion for mastocytosis in a patient who walks into the clinic with any combination of the following: urticarial-type skin manifestations, especially if persistent into adulthood; history of undue reaction to an insect sting; a big spleen in a patient with a history of cutaneous flushing or rash; chronic diarrhea, especially if a biopsy has shown “too many mast cells” in the lamina propria of the small bowel; and positivity for KIT816V mutation.

Dr. Orazi stressed that the majority of patients will have indolent disease, but for the few patients for whom immediate treatment is essential, “the distinction between indolent and aggressive [disease] is really very, very important.”

Patients with advanced systemic mastocytosis can now be effectively treated, following the arrival of midostaurin (Rydapt, Tauritmo) and avapritinib.

Midostaurin, a multikinase/KIT inhibitor, was approved by the Food and Drug Administration in 2017 for the treatment of advanced systemic mastocytosis (ASM, SM-AHN, and MCL). Avapritinib, a selective kinase inhibitor of KIT816V and platelet-derived growth factor receptor alpha as well as multiple KIT exon 11, 11/17 and 17 mutants, gained the same indication in June 2021.

As with all rare diseases, it is challenging to obtain accurate numbers on how many patients are affected by systemic mastocytosis. The first population-based study of the disorder, presented at the 2018 annual meeting of the American Society of Hematology, used the Surveillance, Epidemiology, and End Results database from 2000 to 2014 to estimate incidence at 0.046 per 10,000, which translates to 1,050 new adult cases per year. The study data have never been published in full.

How many of these cases are advanced disease? There are no U.S. data but extrapolating from a Danish registry study that found 82% of systemic mastocytosis cases to be indolent disease, the incidence of advanced systemic mastocytosis in the United States could be as low as 200 adults a year.

This information, in turn, suggests that identifying more patients with advanced disease would not only benefit those patients but would also benefit clinical trial investigators who are seeking the proverbial needle in the haystack.

Nationwide, five clinical trials are recruiting individuals with advanced systemic mastocytosis, collectively looking for 352 patients in the United States. Two of the studies focus on mast-cell activation (NCT0544944) and cutaneous mastocytoses (NCT04846348). Two trials in a range of hematological malignancies are testing bispecific antibodies flotetuzumab and MGD024 (both from Macrogenics; NCT04681105, NCT05362773).

Apex, a phase 2 study of tyrosine-kinase inhibitor bezuclastinib (a Cogent hopeful), is specifically focusing on advanced disease. Dr. Gotlib and coinvestigators are aiming for 140 participants.

As a pathologist, Dr. Orazi said he find mastocytosis fascinating because he believes he has “a truly useful role,” contrasting with some other hematological diseases in which the molecular profile rules.

“Pathology plays a major role here,” he explained, “because you have to correlate what you see at the microscope with the full clinical picture, selected laboratory tests such as CBC and serum tryptase, and molecular results. You often need integration through a pathologist to put all the pieces together.

“It’s easier to treat once you know exactly what disease you’re dealing with and whether it is an aggressive or indolent subtype,” Dr. Orazi concluded.

Dr. Orazi disclosed no conflicts of interest. Dr. Gotlib has disclosed ties with Blueprint Medicines, Deciphera, Incyte, and Kartos Therapeutics, and has led committees for Blueprint Medicine’s EXPLORER and PATHFINDER studies, Deciphera’s Study Steering Committee for ripretinib in AdvSM, and the Central Response Review Committee for the phase 2 study of bezuclastinib in AdvSM.

Systemic mastocytosis is widely underdiagnosed, and many more hematologic oncologists should be looking for it. This call to action was issued late in 2022 by Stanford (Calif.) Cancer Institute’s Jason Gotlib, MD, speaking at the Lymphoma, Leukemia & Myeloma Congress in New York.

Nationwide, approximately 1,000 adults are diagnosed with systemic mastocytosis annually. This rare disease is a myeloid neoplasm with a highly variable phenotypic expression, in which abnormal mast cells proliferate and infiltrate organs and tissues. It swings widely from a nonadvanced form, composed of indolent or smoldering disease, to advanced disease that progresses to leukemia in 6% of cases.

More than 80% of systemic mastocytosis is driven by the KIT D816V mutation. Along with a host of other rare KIT mutations, KIT D816V activates KIT-receptor tyrosine kinase to trigger mast cell proliferation.

Dr. Gotlib could not be contacted for an interview. However, there are many good reasons to identify patients with systemic mastocytosis, according to Attilio Orazi, MD, professor and chair of the department of pathology at Texas Tech University, El Paso. The chief reason is that the patient may be in grave peril.

“The degree of heterogeneity is amazing. ... There’s very indolent [disease], which is really not a big deal. And then you have a disease in which you’re dead in 3 months,” Dr. Orazi said. “So you run the gamut between an indolent, no-problem cutaneous disease to a very nasty systemic, aggressive leukemia-like neoplasm.”

Since 2001, the diagnosis of mastocytosis has been guided by the World Health Organization Classification of Tumours, or “Blue Book.” In 2022, Dr. Orazi along with 137 other senior experts, most of whom were involved in past editions of the Blue Book, published their own version: The International Consensus Classification of Myeloid Neoplasms and Acute Leukemias (the ICC 2022).

In September 2021, this group of specialists held a virtual/in-person advisory committee meeting at the University of Chicago to create the document. One factor in their decision to go it alone, Dr. Orazi said, was that WHO decided to proceed with the fifth edition of the Blue Book using its own internal editorial group without convening an advisory committee, despite repeated requests to do so.

ICC 2022 divides advanced systemic mastocytosis into three subtypes: aggressive systemic mastocytosis (ASM), systemic mastocytosis with an associated hematologic neoplasm (SM-AHN), and mast cell leukemia (MCL). Median survival is 3.5 years for patients with ASM, 2 years for those with SM-AHN and as low as 2 months for MCL.

The second key reason to increase awareness of mastocytosis among physicians, said Dr. Orazi, is that patients falling through the net are likely to be ambulatory, and their presentation can be “a little confusing.”

Patients with indolent disease are relatively straightforward to recognize, explained Dr. Orazi. Similarly, very sick patients with SM-AHN or MCL are easily recognized by hem-oncs.

“But if you see a patient in an ambulatory setting, in your clinic or whatever, and you’re suspicious, then you need to decide [how] you’re going to investigate that patient further,” he said, Dr. Orazi noted the next step is not always obvious, especially for primary-practice or internal medicine physicians likely to be unfamiliar with such a rare disease.

A practice survey published in 2022 by other researchers backed up Dr. Orazi’s remarks. The study found that community/solo-practice physicians were less likely to have tested systemic mastocytosis patients for KIT816V mutation than academic/specialty physicians (58% vs. 80%; P = .004; n = 111). Clinicians treating these patients estimated that it took an average of 8.5 months for a “typical” patient to receive the diagnosis from the time of symptom onset.

The research was headed by Ruben Mesa, MD, director of University of Texas Health, San Antonio, and funded by Blueprint Medicines, the manufacturer of avapritinib (Ayvakit), a new drug for the disease.

Dr. Orazi urged clinicians to have a high degree of suspicion for mastocytosis in a patient who walks into the clinic with any combination of the following: urticarial-type skin manifestations, especially if persistent into adulthood; history of undue reaction to an insect sting; a big spleen in a patient with a history of cutaneous flushing or rash; chronic diarrhea, especially if a biopsy has shown “too many mast cells” in the lamina propria of the small bowel; and positivity for KIT816V mutation.

Dr. Orazi stressed that the majority of patients will have indolent disease, but for the few patients for whom immediate treatment is essential, “the distinction between indolent and aggressive [disease] is really very, very important.”

Patients with advanced systemic mastocytosis can now be effectively treated, following the arrival of midostaurin (Rydapt, Tauritmo) and avapritinib.

Midostaurin, a multikinase/KIT inhibitor, was approved by the Food and Drug Administration in 2017 for the treatment of advanced systemic mastocytosis (ASM, SM-AHN, and MCL). Avapritinib, a selective kinase inhibitor of KIT816V and platelet-derived growth factor receptor alpha as well as multiple KIT exon 11, 11/17 and 17 mutants, gained the same indication in June 2021.

As with all rare diseases, it is challenging to obtain accurate numbers on how many patients are affected by systemic mastocytosis. The first population-based study of the disorder, presented at the 2018 annual meeting of the American Society of Hematology, used the Surveillance, Epidemiology, and End Results database from 2000 to 2014 to estimate incidence at 0.046 per 10,000, which translates to 1,050 new adult cases per year. The study data have never been published in full.

How many of these cases are advanced disease? There are no U.S. data but extrapolating from a Danish registry study that found 82% of systemic mastocytosis cases to be indolent disease, the incidence of advanced systemic mastocytosis in the United States could be as low as 200 adults a year.

This information, in turn, suggests that identifying more patients with advanced disease would not only benefit those patients but would also benefit clinical trial investigators who are seeking the proverbial needle in the haystack.

Nationwide, five clinical trials are recruiting individuals with advanced systemic mastocytosis, collectively looking for 352 patients in the United States. Two of the studies focus on mast-cell activation (NCT0544944) and cutaneous mastocytoses (NCT04846348). Two trials in a range of hematological malignancies are testing bispecific antibodies flotetuzumab and MGD024 (both from Macrogenics; NCT04681105, NCT05362773).

Apex, a phase 2 study of tyrosine-kinase inhibitor bezuclastinib (a Cogent hopeful), is specifically focusing on advanced disease. Dr. Gotlib and coinvestigators are aiming for 140 participants.

As a pathologist, Dr. Orazi said he find mastocytosis fascinating because he believes he has “a truly useful role,” contrasting with some other hematological diseases in which the molecular profile rules.

“Pathology plays a major role here,” he explained, “because you have to correlate what you see at the microscope with the full clinical picture, selected laboratory tests such as CBC and serum tryptase, and molecular results. You often need integration through a pathologist to put all the pieces together.

“It’s easier to treat once you know exactly what disease you’re dealing with and whether it is an aggressive or indolent subtype,” Dr. Orazi concluded.

Dr. Orazi disclosed no conflicts of interest. Dr. Gotlib has disclosed ties with Blueprint Medicines, Deciphera, Incyte, and Kartos Therapeutics, and has led committees for Blueprint Medicine’s EXPLORER and PATHFINDER studies, Deciphera’s Study Steering Committee for ripretinib in AdvSM, and the Central Response Review Committee for the phase 2 study of bezuclastinib in AdvSM.

As a toddler undergoing treatment at McMaster Children’s Hospital in Hamilton, Ont., Caroline Diorio, MD, couldn’t grasp what the nice doctors scurrying in and out of her room were doing. She just knew they were taking care of her.

Dr. Diorio had pediatric immune thrombocytopenia (ITP), a type of platelet disorder in which the immune system attacks blood platelets for usually unknown reasons.

“I remember very much how worried my parents were,” recalled Dr. Diorio, now a hematologist-oncologist at Children’s Hospital of Philadelphia. “And I remember how the tone of the doctor’s voice and the way the doctors communicated provided so much reassurance to my parents.”

Dr. Diorio’s ITP resolved within a few years, but her experience left a lasting impression.

“From that moment on, I don’t remember a time that I didn’t want to be a doctor,” she said. “I had these really formative experiences with doctors who were so lovely, and I thought, ‘I want to do that.’ ”

Though she considered other specialties in medical school at the University of Toronto, Dr. Diorio kept feeling drawn back to pediatric oncology and hematology.

“I have always loved the commitment that parents have to their kids and the team approach that exists,” she said. “Hematology/oncology allowed me to take care of really sick kids but also have this long-term relationship with them and their parents, which I really value and love.”

Dr. Diorio even completed her residency at McMaster alongside one of the same physicians who had cared for her as a child, Ronald Duncan Barr, MD. “It sort of all came full circle,” she said.

Today, Dr. Diorio draws inspiration from memories of her childhood experience. “I try to recreate that and provide as much kindness and compassion as I can for patients and their families, to help when people are in this incredibly vulnerable situation,” she said.

But she takes that even further by researching new therapies for patients who have run out of options, particularly those with T-cell acute lymphoblastic leukemia (T-ALL).

For B-cell ALL and several other blood cancers, an effective option is CAR T-cell therapy, in which physicians collect T-cells from the patient, re-engineer the T cells in the lab so they recognize the proteins expressed on the surface of cancerous cells – called blasts – and then introduce the modified T-cells back into the patient. Once infused, the re-engineered T-cells attack the blasts with the tell-tale proteins.

But with T-ALL, T-cells themselves are infected with cancer, so autologous CAR T-cell therapy is not currently an option, and no allogeneic CAR T-cell therapies have been approved. Dr. Diorio is part of a cutting-edge research team led by David T. Teachey, MD, striving for breakthroughs. “She’s a brilliant clinician, extremely smart and hard-working, exceptional work ethic, great interaction with patients and families with a great bedside manner,” Dr. Teachey said of Dr. Diorio. “She’s just a superstar all around.”

Dr. Teachey first piqued Dr. Diorio’s interest in researching innovative T-ALL therapies when she arrived at CHOP as a hematology/oncology fellow in 2018 and pursued a master of science degree in translational research under his tutelage at the University of Pennsylvania. Then, for a time, the COVID-19 pandemic shut down most research.

“Caroline pivoted and was at the front line, collecting samples and helping with research on SARS-CoV-2 very early in the pandemic,” Dr. Teachey said. “She was able to then pivot back, taking the skills she learned from that work in the pandemic and applying it to what she was doing in the CAR T-cell space and T-ALL.”

Extraordinary gains in pediatric cancer over the past several decades mean that more than 80% of children diagnosed with cancer today will become long-term survivors. “The 20% of the time that we don’t get the result we want is obviously devastating,” Dr. Diorio said. “However, that’s incredibly motivating to try to make better treatments.”

Her current focus is finding a way to use CAR T-cell therapy in children with T-ALL. About 85% of children with T-ALL do well with standard first-line treatments of chemotherapy, but the 15% who relapse or have chemo-refractory disease have a far lower survival rate – less than 30%, Dr. Diorio said.

The problem with autologous CAR T-cell therapy in T-ALL is twofold: It’s difficult to sort out healthy T cells from the cancerous T cells, and the target current re-engineered T-cells go after is on healthy cells, too.

“What happens is a problem called fratricide – basically the CAR T-cells are killing their brothers,” she said. So Dr. Diorio and her colleagues are trying to modify CAR T-cell strategies to target different markers. One target they’re investigating is CD7, but using CRISPR to gene-edit out CD7 from healthy cells requires making two cuts in the DNA.

“Any time you break DNA, you have to repair it, and any time you repair it, there’s a chance of making a mistake,” Dr. Diorio said. So she used a different technique, cytosine-based editing, which requires only one cut. “You put in what you want, and it’s much more precise and less error-prone.” Cytosine-based editing also preserves T cells’ vitality; too many cuts impair T-cell growth, but that doesn’t happen with cytosine-based editing. In August of 2022, Dr. Diorio published a study demonstrating this technique while the team has continued looking for other targets that show up on cancer cells but not on healthy T-cells.

“I’m not invested in one particular strategy,” Dr. Diorio said. “I’m invested in finding a strategy that works for the maximum number of patients.”

That pragmatic approach may be why Dr. Teachey describes her as an out-of-the-box thinker.

“She brings novel ideas to the table, and not everybody who’s a physician-scientist has that ability to really think about taking things in the bench to the bedside and then back again,” Dr. Teachey said. “It’s knowing what questions are important to ask for our patients and how to study those and the research base, so that you can improve treatments for kids with leukemia.”

Their research looks promising so far. Clinical trials are in development for the CD7-targeted CAR T, and they’re collaborating with others on clinical trials for CAR-T targeting another protein, CD38. In the midst of it all, Dr. Diorio remains focused on her patients.

“It’s really a privilege to see the incredible grace people have in these very difficult circumstances,” Dr. Diorio said. “I find it really motivating to try to make things easier for people, and I try to spend every day looking for better treatments so people don’t have to go through that.”

Dr. Diorio has no disclosures. Dr. Teachey has served on the advisory boards of BEAM, Jazz, Janssen, and Sobi and has received research funding from BEAM, Jazz, Servier, and Neoimmune Tech. He has multiple patents pending on CAR-T therapy.

As a toddler undergoing treatment at McMaster Children’s Hospital in Hamilton, Ont., Caroline Diorio, MD, couldn’t grasp what the nice doctors scurrying in and out of her room were doing. She just knew they were taking care of her.

Dr. Diorio had pediatric immune thrombocytopenia (ITP), a type of platelet disorder in which the immune system attacks blood platelets for usually unknown reasons.

“I remember very much how worried my parents were,” recalled Dr. Diorio, now a hematologist-oncologist at Children’s Hospital of Philadelphia. “And I remember how the tone of the doctor’s voice and the way the doctors communicated provided so much reassurance to my parents.”

Dr. Diorio’s ITP resolved within a few years, but her experience left a lasting impression.

“From that moment on, I don’t remember a time that I didn’t want to be a doctor,” she said. “I had these really formative experiences with doctors who were so lovely, and I thought, ‘I want to do that.’ ”

Though she considered other specialties in medical school at the University of Toronto, Dr. Diorio kept feeling drawn back to pediatric oncology and hematology.

“I have always loved the commitment that parents have to their kids and the team approach that exists,” she said. “Hematology/oncology allowed me to take care of really sick kids but also have this long-term relationship with them and their parents, which I really value and love.”

Dr. Diorio even completed her residency at McMaster alongside one of the same physicians who had cared for her as a child, Ronald Duncan Barr, MD. “It sort of all came full circle,” she said.

Today, Dr. Diorio draws inspiration from memories of her childhood experience. “I try to recreate that and provide as much kindness and compassion as I can for patients and their families, to help when people are in this incredibly vulnerable situation,” she said.

But she takes that even further by researching new therapies for patients who have run out of options, particularly those with T-cell acute lymphoblastic leukemia (T-ALL).

For B-cell ALL and several other blood cancers, an effective option is CAR T-cell therapy, in which physicians collect T-cells from the patient, re-engineer the T cells in the lab so they recognize the proteins expressed on the surface of cancerous cells – called blasts – and then introduce the modified T-cells back into the patient. Once infused, the re-engineered T-cells attack the blasts with the tell-tale proteins.

But with T-ALL, T-cells themselves are infected with cancer, so autologous CAR T-cell therapy is not currently an option, and no allogeneic CAR T-cell therapies have been approved. Dr. Diorio is part of a cutting-edge research team led by David T. Teachey, MD, striving for breakthroughs. “She’s a brilliant clinician, extremely smart and hard-working, exceptional work ethic, great interaction with patients and families with a great bedside manner,” Dr. Teachey said of Dr. Diorio. “She’s just a superstar all around.”

Dr. Teachey first piqued Dr. Diorio’s interest in researching innovative T-ALL therapies when she arrived at CHOP as a hematology/oncology fellow in 2018 and pursued a master of science degree in translational research under his tutelage at the University of Pennsylvania. Then, for a time, the COVID-19 pandemic shut down most research.

“Caroline pivoted and was at the front line, collecting samples and helping with research on SARS-CoV-2 very early in the pandemic,” Dr. Teachey said. “She was able to then pivot back, taking the skills she learned from that work in the pandemic and applying it to what she was doing in the CAR T-cell space and T-ALL.”

Extraordinary gains in pediatric cancer over the past several decades mean that more than 80% of children diagnosed with cancer today will become long-term survivors. “The 20% of the time that we don’t get the result we want is obviously devastating,” Dr. Diorio said. “However, that’s incredibly motivating to try to make better treatments.”

Her current focus is finding a way to use CAR T-cell therapy in children with T-ALL. About 85% of children with T-ALL do well with standard first-line treatments of chemotherapy, but the 15% who relapse or have chemo-refractory disease have a far lower survival rate – less than 30%, Dr. Diorio said.

The problem with autologous CAR T-cell therapy in T-ALL is twofold: It’s difficult to sort out healthy T cells from the cancerous T cells, and the target current re-engineered T-cells go after is on healthy cells, too.

“What happens is a problem called fratricide – basically the CAR T-cells are killing their brothers,” she said. So Dr. Diorio and her colleagues are trying to modify CAR T-cell strategies to target different markers. One target they’re investigating is CD7, but using CRISPR to gene-edit out CD7 from healthy cells requires making two cuts in the DNA.

“Any time you break DNA, you have to repair it, and any time you repair it, there’s a chance of making a mistake,” Dr. Diorio said. So she used a different technique, cytosine-based editing, which requires only one cut. “You put in what you want, and it’s much more precise and less error-prone.” Cytosine-based editing also preserves T cells’ vitality; too many cuts impair T-cell growth, but that doesn’t happen with cytosine-based editing. In August of 2022, Dr. Diorio published a study demonstrating this technique while the team has continued looking for other targets that show up on cancer cells but not on healthy T-cells.

“I’m not invested in one particular strategy,” Dr. Diorio said. “I’m invested in finding a strategy that works for the maximum number of patients.”

That pragmatic approach may be why Dr. Teachey describes her as an out-of-the-box thinker.

“She brings novel ideas to the table, and not everybody who’s a physician-scientist has that ability to really think about taking things in the bench to the bedside and then back again,” Dr. Teachey said. “It’s knowing what questions are important to ask for our patients and how to study those and the research base, so that you can improve treatments for kids with leukemia.”

Their research looks promising so far. Clinical trials are in development for the CD7-targeted CAR T, and they’re collaborating with others on clinical trials for CAR-T targeting another protein, CD38. In the midst of it all, Dr. Diorio remains focused on her patients.

“It’s really a privilege to see the incredible grace people have in these very difficult circumstances,” Dr. Diorio said. “I find it really motivating to try to make things easier for people, and I try to spend every day looking for better treatments so people don’t have to go through that.”

Dr. Diorio has no disclosures. Dr. Teachey has served on the advisory boards of BEAM, Jazz, Janssen, and Sobi and has received research funding from BEAM, Jazz, Servier, and Neoimmune Tech. He has multiple patents pending on CAR-T therapy.

As a toddler undergoing treatment at McMaster Children’s Hospital in Hamilton, Ont., Caroline Diorio, MD, couldn’t grasp what the nice doctors scurrying in and out of her room were doing. She just knew they were taking care of her.

Dr. Diorio had pediatric immune thrombocytopenia (ITP), a type of platelet disorder in which the immune system attacks blood platelets for usually unknown reasons.

“I remember very much how worried my parents were,” recalled Dr. Diorio, now a hematologist-oncologist at Children’s Hospital of Philadelphia. “And I remember how the tone of the doctor’s voice and the way the doctors communicated provided so much reassurance to my parents.”

Dr. Diorio’s ITP resolved within a few years, but her experience left a lasting impression.

“From that moment on, I don’t remember a time that I didn’t want to be a doctor,” she said. “I had these really formative experiences with doctors who were so lovely, and I thought, ‘I want to do that.’ ”

Though she considered other specialties in medical school at the University of Toronto, Dr. Diorio kept feeling drawn back to pediatric oncology and hematology.

“I have always loved the commitment that parents have to their kids and the team approach that exists,” she said. “Hematology/oncology allowed me to take care of really sick kids but also have this long-term relationship with them and their parents, which I really value and love.”

Dr. Diorio even completed her residency at McMaster alongside one of the same physicians who had cared for her as a child, Ronald Duncan Barr, MD. “It sort of all came full circle,” she said.

Today, Dr. Diorio draws inspiration from memories of her childhood experience. “I try to recreate that and provide as much kindness and compassion as I can for patients and their families, to help when people are in this incredibly vulnerable situation,” she said.

But she takes that even further by researching new therapies for patients who have run out of options, particularly those with T-cell acute lymphoblastic leukemia (T-ALL).

For B-cell ALL and several other blood cancers, an effective option is CAR T-cell therapy, in which physicians collect T-cells from the patient, re-engineer the T cells in the lab so they recognize the proteins expressed on the surface of cancerous cells – called blasts – and then introduce the modified T-cells back into the patient. Once infused, the re-engineered T-cells attack the blasts with the tell-tale proteins.

But with T-ALL, T-cells themselves are infected with cancer, so autologous CAR T-cell therapy is not currently an option, and no allogeneic CAR T-cell therapies have been approved. Dr. Diorio is part of a cutting-edge research team led by David T. Teachey, MD, striving for breakthroughs. “She’s a brilliant clinician, extremely smart and hard-working, exceptional work ethic, great interaction with patients and families with a great bedside manner,” Dr. Teachey said of Dr. Diorio. “She’s just a superstar all around.”

Dr. Teachey first piqued Dr. Diorio’s interest in researching innovative T-ALL therapies when she arrived at CHOP as a hematology/oncology fellow in 2018 and pursued a master of science degree in translational research under his tutelage at the University of Pennsylvania. Then, for a time, the COVID-19 pandemic shut down most research.

“Caroline pivoted and was at the front line, collecting samples and helping with research on SARS-CoV-2 very early in the pandemic,” Dr. Teachey said. “She was able to then pivot back, taking the skills she learned from that work in the pandemic and applying it to what she was doing in the CAR T-cell space and T-ALL.”

Extraordinary gains in pediatric cancer over the past several decades mean that more than 80% of children diagnosed with cancer today will become long-term survivors. “The 20% of the time that we don’t get the result we want is obviously devastating,” Dr. Diorio said. “However, that’s incredibly motivating to try to make better treatments.”

Her current focus is finding a way to use CAR T-cell therapy in children with T-ALL. About 85% of children with T-ALL do well with standard first-line treatments of chemotherapy, but the 15% who relapse or have chemo-refractory disease have a far lower survival rate – less than 30%, Dr. Diorio said.

The problem with autologous CAR T-cell therapy in T-ALL is twofold: It’s difficult to sort out healthy T cells from the cancerous T cells, and the target current re-engineered T-cells go after is on healthy cells, too.

“What happens is a problem called fratricide – basically the CAR T-cells are killing their brothers,” she said. So Dr. Diorio and her colleagues are trying to modify CAR T-cell strategies to target different markers. One target they’re investigating is CD7, but using CRISPR to gene-edit out CD7 from healthy cells requires making two cuts in the DNA.

“Any time you break DNA, you have to repair it, and any time you repair it, there’s a chance of making a mistake,” Dr. Diorio said. So she used a different technique, cytosine-based editing, which requires only one cut. “You put in what you want, and it’s much more precise and less error-prone.” Cytosine-based editing also preserves T cells’ vitality; too many cuts impair T-cell growth, but that doesn’t happen with cytosine-based editing. In August of 2022, Dr. Diorio published a study demonstrating this technique while the team has continued looking for other targets that show up on cancer cells but not on healthy T-cells.

“I’m not invested in one particular strategy,” Dr. Diorio said. “I’m invested in finding a strategy that works for the maximum number of patients.”

That pragmatic approach may be why Dr. Teachey describes her as an out-of-the-box thinker.

“She brings novel ideas to the table, and not everybody who’s a physician-scientist has that ability to really think about taking things in the bench to the bedside and then back again,” Dr. Teachey said. “It’s knowing what questions are important to ask for our patients and how to study those and the research base, so that you can improve treatments for kids with leukemia.”

Their research looks promising so far. Clinical trials are in development for the CD7-targeted CAR T, and they’re collaborating with others on clinical trials for CAR-T targeting another protein, CD38. In the midst of it all, Dr. Diorio remains focused on her patients.

“It’s really a privilege to see the incredible grace people have in these very difficult circumstances,” Dr. Diorio said. “I find it really motivating to try to make things easier for people, and I try to spend every day looking for better treatments so people don’t have to go through that.”

Dr. Diorio has no disclosures. Dr. Teachey has served on the advisory boards of BEAM, Jazz, Janssen, and Sobi and has received research funding from BEAM, Jazz, Servier, and Neoimmune Tech. He has multiple patents pending on CAR-T therapy.

NEW ORLEANS – The immunotherapy drug blinatumomab improves survival as a first-line treatment in certain younger adult patients with B-lineage acute lymphoblastic leukemia, investigators have found. The extremely expensive drug is currently Food and Drug Administration approved for B-lineage ALL in relapsed/refractory cases.

“We feel that this represents a new standard of care for these patients and should be incorporated into their standard therapy,” said lead author and hematologist Mark R. Litzow, MD, of Mayo Clinic in Rochester, Minn., in a news briefing at the annual meeting of the American Society of Hematology.

B-lineage ALL, also known as B-cell ALL, represents 75% of cases of the blood cancer in adults according to the Leukemia & Lymphoma Society. It occurs when there’s an overgrowth of immature white blood cells known as B-cell lymphoblasts. “These are the blast cells that don’t function well and cause these patients to develop infections and bleeding,” Dr. Litzow said.

Treatments include chemotherapy and stem-cell transplants. Blinatumomab, a bispecific T-cell engager molecule, is FDA approved for patients with relapsed/refractory B-lineage ALL and those with morphologic complete remission who still have measurable residual disease (MRD).

As the new study notes, some patients who undergo chemotherapy and reach remission have poor survival outcomes even when there’s no sign of MRD. “Even though we can’t find leukemia in the patients’ bone marrow, it’s still hiding there,” Dr. Litzow said.

The new phase 3, randomized trial aims to determine if adding blinatumomab (Blincyto) to first-line chemotherapy improves outcomes. The drug “brings a normal T cell, part of the immune system, in proximity to a leukemia plasma cell and kills it.”

For the study, researchers from 2013 to 2019 recruited 488 patients aged 30-70 years with newly diagnosed BCR::ABL1 negative B-lineage ALL (median age = 51). The subjects underwent chemotherapy, and then were “randomized to receive an additional four cycles of consolidation chemo or two cycles of blin [blinatumomab] for 28 days each cycle followed by three cycles of consolidation chemo, another 4-week cycle of blinatumomab (third cycle of blinatumomab) followed by an additional cycle of chemo and then a fourth cycle of blinatumomab (step 3),” the researchers reported. “Following completion of consolidation chemo +/– blin, patients were given 2.5 years of POMP [prednisone, vincristine, 6-mercaptopurine, and methotrexate] maintenance therapy timed from the start of the intensification cycle (step 4).”

There were 112 patients in each group. Among MRD-negative patients, 56 patients died – 17 in the blinatumomab arm and 39 in the control arm at the third interim efficacy analysis. At a mean follow-up of 43 months, median overall survival for patients in the blinatumomab arm was not reached vs. 71.4 months in the control group (hazard ratio, 0.42, 95% confidence interval, 0.24-0.75; P = .003).

“The patients that got blinatumomab plus chemotherapy had an improved survival over those that got the standard chemotherapy,” Dr. Litzow said.

Dr. Litzow didn’t discuss the drug’s expense in his presentation. According to a 2019 report, when a daily vial of blinatumomab cost $3,464-$3,815, a treatment course of five month-long cycles could run to $535,000. According to drugs.com, the cost now is $4,740 per vial – more than $660,000 for five cycles.

In an interview, Cleveland Clinic hematologist/oncologist Anjali Advani, MD, said the study is “groundbreaking and one of the most exciting studies to come along in the acute lymphoblastic leukemia field.”

The trial “is one of the first studies to show improvement in outcome in a randomized manner with the addition of a novel agent,” she added. “This will change our standard of care for these patients.”

The National Cancer Institute funded the trial and drug manufacturer Amgen provided the medication and support through a cooperative research and development agreement.

Dr. Litzow discloses relationships with Actinium, Jazz, Syndax, Novartis, Astellas, Amgen, Abbvie, Pluristem and Biosight. Other authors have various disclosures with multiple drugmakers. Dr. Advani discloses relationships with Amgen, Jazz, Nkarta, Taiho, Beam, GMI, Kura, Pfizer, OBI, Incyte, Kite, ImmunoGen, GlycoMimetics, SGN, MacroGenics, and Servier.

NEW ORLEANS – The immunotherapy drug blinatumomab improves survival as a first-line treatment in certain younger adult patients with B-lineage acute lymphoblastic leukemia, investigators have found. The extremely expensive drug is currently Food and Drug Administration approved for B-lineage ALL in relapsed/refractory cases.

“We feel that this represents a new standard of care for these patients and should be incorporated into their standard therapy,” said lead author and hematologist Mark R. Litzow, MD, of Mayo Clinic in Rochester, Minn., in a news briefing at the annual meeting of the American Society of Hematology.

B-lineage ALL, also known as B-cell ALL, represents 75% of cases of the blood cancer in adults according to the Leukemia & Lymphoma Society. It occurs when there’s an overgrowth of immature white blood cells known as B-cell lymphoblasts. “These are the blast cells that don’t function well and cause these patients to develop infections and bleeding,” Dr. Litzow said.

Treatments include chemotherapy and stem-cell transplants. Blinatumomab, a bispecific T-cell engager molecule, is FDA approved for patients with relapsed/refractory B-lineage ALL and those with morphologic complete remission who still have measurable residual disease (MRD).

As the new study notes, some patients who undergo chemotherapy and reach remission have poor survival outcomes even when there’s no sign of MRD. “Even though we can’t find leukemia in the patients’ bone marrow, it’s still hiding there,” Dr. Litzow said.

The new phase 3, randomized trial aims to determine if adding blinatumomab (Blincyto) to first-line chemotherapy improves outcomes. The drug “brings a normal T cell, part of the immune system, in proximity to a leukemia plasma cell and kills it.”

For the study, researchers from 2013 to 2019 recruited 488 patients aged 30-70 years with newly diagnosed BCR::ABL1 negative B-lineage ALL (median age = 51). The subjects underwent chemotherapy, and then were “randomized to receive an additional four cycles of consolidation chemo or two cycles of blin [blinatumomab] for 28 days each cycle followed by three cycles of consolidation chemo, another 4-week cycle of blinatumomab (third cycle of blinatumomab) followed by an additional cycle of chemo and then a fourth cycle of blinatumomab (step 3),” the researchers reported. “Following completion of consolidation chemo +/– blin, patients were given 2.5 years of POMP [prednisone, vincristine, 6-mercaptopurine, and methotrexate] maintenance therapy timed from the start of the intensification cycle (step 4).”

There were 112 patients in each group. Among MRD-negative patients, 56 patients died – 17 in the blinatumomab arm and 39 in the control arm at the third interim efficacy analysis. At a mean follow-up of 43 months, median overall survival for patients in the blinatumomab arm was not reached vs. 71.4 months in the control group (hazard ratio, 0.42, 95% confidence interval, 0.24-0.75; P = .003).

“The patients that got blinatumomab plus chemotherapy had an improved survival over those that got the standard chemotherapy,” Dr. Litzow said.

Dr. Litzow didn’t discuss the drug’s expense in his presentation. According to a 2019 report, when a daily vial of blinatumomab cost $3,464-$3,815, a treatment course of five month-long cycles could run to $535,000. According to drugs.com, the cost now is $4,740 per vial – more than $660,000 for five cycles.

In an interview, Cleveland Clinic hematologist/oncologist Anjali Advani, MD, said the study is “groundbreaking and one of the most exciting studies to come along in the acute lymphoblastic leukemia field.”

The trial “is one of the first studies to show improvement in outcome in a randomized manner with the addition of a novel agent,” she added. “This will change our standard of care for these patients.”

The National Cancer Institute funded the trial and drug manufacturer Amgen provided the medication and support through a cooperative research and development agreement.

Dr. Litzow discloses relationships with Actinium, Jazz, Syndax, Novartis, Astellas, Amgen, Abbvie, Pluristem and Biosight. Other authors have various disclosures with multiple drugmakers. Dr. Advani discloses relationships with Amgen, Jazz, Nkarta, Taiho, Beam, GMI, Kura, Pfizer, OBI, Incyte, Kite, ImmunoGen, GlycoMimetics, SGN, MacroGenics, and Servier.

NEW ORLEANS – The immunotherapy drug blinatumomab improves survival as a first-line treatment in certain younger adult patients with B-lineage acute lymphoblastic leukemia, investigators have found. The extremely expensive drug is currently Food and Drug Administration approved for B-lineage ALL in relapsed/refractory cases.

“We feel that this represents a new standard of care for these patients and should be incorporated into their standard therapy,” said lead author and hematologist Mark R. Litzow, MD, of Mayo Clinic in Rochester, Minn., in a news briefing at the annual meeting of the American Society of Hematology.

B-lineage ALL, also known as B-cell ALL, represents 75% of cases of the blood cancer in adults according to the Leukemia & Lymphoma Society. It occurs when there’s an overgrowth of immature white blood cells known as B-cell lymphoblasts. “These are the blast cells that don’t function well and cause these patients to develop infections and bleeding,” Dr. Litzow said.

Treatments include chemotherapy and stem-cell transplants. Blinatumomab, a bispecific T-cell engager molecule, is FDA approved for patients with relapsed/refractory B-lineage ALL and those with morphologic complete remission who still have measurable residual disease (MRD).

As the new study notes, some patients who undergo chemotherapy and reach remission have poor survival outcomes even when there’s no sign of MRD. “Even though we can’t find leukemia in the patients’ bone marrow, it’s still hiding there,” Dr. Litzow said.

The new phase 3, randomized trial aims to determine if adding blinatumomab (Blincyto) to first-line chemotherapy improves outcomes. The drug “brings a normal T cell, part of the immune system, in proximity to a leukemia plasma cell and kills it.”

For the study, researchers from 2013 to 2019 recruited 488 patients aged 30-70 years with newly diagnosed BCR::ABL1 negative B-lineage ALL (median age = 51). The subjects underwent chemotherapy, and then were “randomized to receive an additional four cycles of consolidation chemo or two cycles of blin [blinatumomab] for 28 days each cycle followed by three cycles of consolidation chemo, another 4-week cycle of blinatumomab (third cycle of blinatumomab) followed by an additional cycle of chemo and then a fourth cycle of blinatumomab (step 3),” the researchers reported. “Following completion of consolidation chemo +/– blin, patients were given 2.5 years of POMP [prednisone, vincristine, 6-mercaptopurine, and methotrexate] maintenance therapy timed from the start of the intensification cycle (step 4).”

There were 112 patients in each group. Among MRD-negative patients, 56 patients died – 17 in the blinatumomab arm and 39 in the control arm at the third interim efficacy analysis. At a mean follow-up of 43 months, median overall survival for patients in the blinatumomab arm was not reached vs. 71.4 months in the control group (hazard ratio, 0.42, 95% confidence interval, 0.24-0.75; P = .003).

“The patients that got blinatumomab plus chemotherapy had an improved survival over those that got the standard chemotherapy,” Dr. Litzow said.

Dr. Litzow didn’t discuss the drug’s expense in his presentation. According to a 2019 report, when a daily vial of blinatumomab cost $3,464-$3,815, a treatment course of five month-long cycles could run to $535,000. According to drugs.com, the cost now is $4,740 per vial – more than $660,000 for five cycles.

In an interview, Cleveland Clinic hematologist/oncologist Anjali Advani, MD, said the study is “groundbreaking and one of the most exciting studies to come along in the acute lymphoblastic leukemia field.”

The trial “is one of the first studies to show improvement in outcome in a randomized manner with the addition of a novel agent,” she added. “This will change our standard of care for these patients.”

The National Cancer Institute funded the trial and drug manufacturer Amgen provided the medication and support through a cooperative research and development agreement.

Dr. Litzow discloses relationships with Actinium, Jazz, Syndax, Novartis, Astellas, Amgen, Abbvie, Pluristem and Biosight. Other authors have various disclosures with multiple drugmakers. Dr. Advani discloses relationships with Amgen, Jazz, Nkarta, Taiho, Beam, GMI, Kura, Pfizer, OBI, Incyte, Kite, ImmunoGen, GlycoMimetics, SGN, MacroGenics, and Servier.

NEW ORLEANS – A study aimed at improving outcomes and reducing toxicity of treatment for children and young adults with acute lymphoblastic leukemia (ALL) or lymphoblastic lymphoma found that, contrary to long-held assumptions, high-dose methotrexate does not reduce the risk for central nervous system relapse.

The same study also addressed two other issues related to standard care for these patients: 1) the dosage of dexamethasone used during the first treatment phase (results of which had already been reported some years ago) and 2) the impact of omitting monthly pulses of dexamethasone and vincristine after initial treatment.

“The trial did not give us the answers we were looking for, but that’s why we do randomized trials, and at least we have one clear answer, which is that high-dose methotrexate does not seem to have benefit in reducing the risk of CNS relapse,” reported study investigator Ajay Vora, MSc, from Great Ormond Street Hospital, London.

Among 1,570 patients randomly assigned in one group of the UKALL2011 trial, 5-year rates of CNS relapse were identical at 5.6% for patients treated with either high-dose methotrexate or standard interim maintenance with oral mercaptopurine and oral and intrathecal methotrexate.

There was a hint, however, that high-dose methotrexate could have a beneficial effect by reducing relapses in bone marrow for some subgroups of patients with B-lineage disease after dexamethasone induction, Dr. Vora commented.

He was speaking at a press briefing at the annual meeting of the American Society of Hematology, prior to the presentation of the data by Amy A. Kirkwood, MSc, from the University College London Cancer Institute.

Reacting to the results, Cynthia E. Dunbar, MD, chief of the Translational Stem Cell Biology Branch at the National Heart, Lung, and Blood Institute in Bethesda, Md., emphasized that “in patients treated with the UKALL regimen, high doses of methotrexate did not reduce the rate of CNS relapse, contrary to our long-standing beliefs.”

“Going forward, patients can be spared the risk of high-dose methotrexate without increasing their risk of recurrence in the central nervous system,” she said.

“As researchers in hematology, we look at it as our duty to question the standard approaches that we use to treat patients, even those that we thought of as tried-and-true,” said briefing moderator Mikkael Sekeres, MD, of the Sylvester Comprehensive Cancer Center at the University of Miami. This is one of the abstracts that “challenge some of those standards and in fact reveal that in many cases, giving less therapy and being less restrictive is actually better for patients or at least no worse.”
 

Complex design

The UKALL2011 trial had a byzantine design, with the overarching goal of finding out which treatment and maintenance strategy best finds the sweet spot between efficacy and toxicity in children and young adults (up to age 25) with ALL and lymphoblastic lymphoma.

One question that was already answered, as investigators reported at the 2017 ASH annual meeting, came from the first randomization in the study, designed to see whether a shorter course of dexamethasone – 14 days versus the standard 28 days – could reduce induction toxicity. It did not.

Now, at ASH 2022, the investigators reported outcomes from the second phase of the trial, which included two randomizations: one comparing high-dose methotrexate with standard interim maintenance to reduce CNS relapse risk, and one to see whether forgoing pulses of vincristine/dexamethasone could reduce maintenance morbidity.

Patients were stratified by National Cancer Institute minimal residual disease (MRD) risk categories, cytogenetics, and end-of-induction MRD to receive one of three treatment regimens. Patients with MRD high risk, defined as MRD greater than 0.5% at the end of consolidation, were not eligible for second-phase randomization and instead received off-protocol therapies.The second randomization was factorial, stratified by NCI and MRD risk groups, resulting in four arms: high-dose methotrexate with or without pulses and standard interim maintenance with our without pulses.

Standard interim maintenance in this trial was 2 months of oral mercaptopurine/methotrexate monthly pulses and single intrathecal methotrexate in two of the regimens, as well as five doses of escalating intravenous methotrexate plus vincristine and two doses of pegylated asparaginase in the third.

High-dose methotrexate was given at a dose of 5 g/m² for four doses 2 weeks apart, low dose 6-mercaptopurine, plus two doses of pegylated asparaginase in one regimen only.
 

Equivocal conclusions

As noted above, CNS relapse, the primary endpoint for the interim maintenance randomization, did not differ between the groups, with identical 5-year relapse rates. Similarly, 5-year event-free survival (EFS) rates were 90.3% in the high-dose group and 89.5% in the standard group, a difference that was not statistically significant (P = .68).

There was, however, an interaction between the first (short- vs. standard-course dexamethasone) and the interim maintenance randomizations, indicating significantly inferior EFS outcomes for patients who had received the short dose of dexamethasone followed by high-dose methotrexate, especially among patients who did not receive pulses (P = .006).

An analysis of patients treated with standard dexamethasone showed that those who received high-dose methotrexate had a lower risk for bone marrow relapse, with a hazard ratio of 0.62 (P = .029), and trends, albeit nonsignificant, toward better EFS and overall survival.

In addition, the overall results suggested that steroid pulses could be safely omitted without leading to an increase in bone marrow relapses: the 5-year rates of bone marrow relapse were 10.2% with pulses and 12.2% without, although omitting pulses was associated with a slight but significant decrease in EFS overall (P = .01). The effect was attenuated among patients who had received standard-course dexamethasone and high-dose methotrexate. Leaving out the pulses also reduced rates of grade 3 or 4 adverse events, including febrile neutropenia, Ms. Kirkwood noted in her presentation.

The investigators plan to analyze quality-of-life outcomes related to dexamethasone-vincristine pulses to see whether doing so could tip the balance in favor of leaving them out of therapy, and they will continue to follow patients to see whether their findings hold.

UKALL2011 was funded by Children with Cancer UK, Blood Cancer UK, and Cancer Research UK. Ms. Kirkwood disclosed consulting for and receiving honoraria from Kite. Dr. Vora reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

NEW ORLEANS – A study aimed at improving outcomes and reducing toxicity of treatment for children and young adults with acute lymphoblastic leukemia (ALL) or lymphoblastic lymphoma found that, contrary to long-held assumptions, high-dose methotrexate does not reduce the risk for central nervous system relapse.

The same study also addressed two other issues related to standard care for these patients: 1) the dosage of dexamethasone used during the first treatment phase (results of which had already been reported some years ago) and 2) the impact of omitting monthly pulses of dexamethasone and vincristine after initial treatment.

“The trial did not give us the answers we were looking for, but that’s why we do randomized trials, and at least we have one clear answer, which is that high-dose methotrexate does not seem to have benefit in reducing the risk of CNS relapse,” reported study investigator Ajay Vora, MSc, from Great Ormond Street Hospital, London.

Among 1,570 patients randomly assigned in one group of the UKALL2011 trial, 5-year rates of CNS relapse were identical at 5.6% for patients treated with either high-dose methotrexate or standard interim maintenance with oral mercaptopurine and oral and intrathecal methotrexate.

There was a hint, however, that high-dose methotrexate could have a beneficial effect by reducing relapses in bone marrow for some subgroups of patients with B-lineage disease after dexamethasone induction, Dr. Vora commented.

He was speaking at a press briefing at the annual meeting of the American Society of Hematology, prior to the presentation of the data by Amy A. Kirkwood, MSc, from the University College London Cancer Institute.

Reacting to the results, Cynthia E. Dunbar, MD, chief of the Translational Stem Cell Biology Branch at the National Heart, Lung, and Blood Institute in Bethesda, Md., emphasized that “in patients treated with the UKALL regimen, high doses of methotrexate did not reduce the rate of CNS relapse, contrary to our long-standing beliefs.”

“Going forward, patients can be spared the risk of high-dose methotrexate without increasing their risk of recurrence in the central nervous system,” she said.

“As researchers in hematology, we look at it as our duty to question the standard approaches that we use to treat patients, even those that we thought of as tried-and-true,” said briefing moderator Mikkael Sekeres, MD, of the Sylvester Comprehensive Cancer Center at the University of Miami. This is one of the abstracts that “challenge some of those standards and in fact reveal that in many cases, giving less therapy and being less restrictive is actually better for patients or at least no worse.”
 

Complex design

The UKALL2011 trial had a byzantine design, with the overarching goal of finding out which treatment and maintenance strategy best finds the sweet spot between efficacy and toxicity in children and young adults (up to age 25) with ALL and lymphoblastic lymphoma.

One question that was already answered, as investigators reported at the 2017 ASH annual meeting, came from the first randomization in the study, designed to see whether a shorter course of dexamethasone – 14 days versus the standard 28 days – could reduce induction toxicity. It did not.

Now, at ASH 2022, the investigators reported outcomes from the second phase of the trial, which included two randomizations: one comparing high-dose methotrexate with standard interim maintenance to reduce CNS relapse risk, and one to see whether forgoing pulses of vincristine/dexamethasone could reduce maintenance morbidity.

Patients were stratified by National Cancer Institute minimal residual disease (MRD) risk categories, cytogenetics, and end-of-induction MRD to receive one of three treatment regimens. Patients with MRD high risk, defined as MRD greater than 0.5% at the end of consolidation, were not eligible for second-phase randomization and instead received off-protocol therapies.The second randomization was factorial, stratified by NCI and MRD risk groups, resulting in four arms: high-dose methotrexate with or without pulses and standard interim maintenance with our without pulses.

Standard interim maintenance in this trial was 2 months of oral mercaptopurine/methotrexate monthly pulses and single intrathecal methotrexate in two of the regimens, as well as five doses of escalating intravenous methotrexate plus vincristine and two doses of pegylated asparaginase in the third.

High-dose methotrexate was given at a dose of 5 g/m² for four doses 2 weeks apart, low dose 6-mercaptopurine, plus two doses of pegylated asparaginase in one regimen only.
 

Equivocal conclusions

As noted above, CNS relapse, the primary endpoint for the interim maintenance randomization, did not differ between the groups, with identical 5-year relapse rates. Similarly, 5-year event-free survival (EFS) rates were 90.3% in the high-dose group and 89.5% in the standard group, a difference that was not statistically significant (P = .68).

There was, however, an interaction between the first (short- vs. standard-course dexamethasone) and the interim maintenance randomizations, indicating significantly inferior EFS outcomes for patients who had received the short dose of dexamethasone followed by high-dose methotrexate, especially among patients who did not receive pulses (P = .006).

An analysis of patients treated with standard dexamethasone showed that those who received high-dose methotrexate had a lower risk for bone marrow relapse, with a hazard ratio of 0.62 (P = .029), and trends, albeit nonsignificant, toward better EFS and overall survival.

In addition, the overall results suggested that steroid pulses could be safely omitted without leading to an increase in bone marrow relapses: the 5-year rates of bone marrow relapse were 10.2% with pulses and 12.2% without, although omitting pulses was associated with a slight but significant decrease in EFS overall (P = .01). The effect was attenuated among patients who had received standard-course dexamethasone and high-dose methotrexate. Leaving out the pulses also reduced rates of grade 3 or 4 adverse events, including febrile neutropenia, Ms. Kirkwood noted in her presentation.

The investigators plan to analyze quality-of-life outcomes related to dexamethasone-vincristine pulses to see whether doing so could tip the balance in favor of leaving them out of therapy, and they will continue to follow patients to see whether their findings hold.

UKALL2011 was funded by Children with Cancer UK, Blood Cancer UK, and Cancer Research UK. Ms. Kirkwood disclosed consulting for and receiving honoraria from Kite. Dr. Vora reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

NEW ORLEANS – A study aimed at improving outcomes and reducing toxicity of treatment for children and young adults with acute lymphoblastic leukemia (ALL) or lymphoblastic lymphoma found that, contrary to long-held assumptions, high-dose methotrexate does not reduce the risk for central nervous system relapse.

The same study also addressed two other issues related to standard care for these patients: 1) the dosage of dexamethasone used during the first treatment phase (results of which had already been reported some years ago) and 2) the impact of omitting monthly pulses of dexamethasone and vincristine after initial treatment.

“The trial did not give us the answers we were looking for, but that’s why we do randomized trials, and at least we have one clear answer, which is that high-dose methotrexate does not seem to have benefit in reducing the risk of CNS relapse,” reported study investigator Ajay Vora, MSc, from Great Ormond Street Hospital, London.

Among 1,570 patients randomly assigned in one group of the UKALL2011 trial, 5-year rates of CNS relapse were identical at 5.6% for patients treated with either high-dose methotrexate or standard interim maintenance with oral mercaptopurine and oral and intrathecal methotrexate.

There was a hint, however, that high-dose methotrexate could have a beneficial effect by reducing relapses in bone marrow for some subgroups of patients with B-lineage disease after dexamethasone induction, Dr. Vora commented.

He was speaking at a press briefing at the annual meeting of the American Society of Hematology, prior to the presentation of the data by Amy A. Kirkwood, MSc, from the University College London Cancer Institute.

Reacting to the results, Cynthia E. Dunbar, MD, chief of the Translational Stem Cell Biology Branch at the National Heart, Lung, and Blood Institute in Bethesda, Md., emphasized that “in patients treated with the UKALL regimen, high doses of methotrexate did not reduce the rate of CNS relapse, contrary to our long-standing beliefs.”

“Going forward, patients can be spared the risk of high-dose methotrexate without increasing their risk of recurrence in the central nervous system,” she said.

“As researchers in hematology, we look at it as our duty to question the standard approaches that we use to treat patients, even those that we thought of as tried-and-true,” said briefing moderator Mikkael Sekeres, MD, of the Sylvester Comprehensive Cancer Center at the University of Miami. This is one of the abstracts that “challenge some of those standards and in fact reveal that in many cases, giving less therapy and being less restrictive is actually better for patients or at least no worse.”
 

Complex design

The UKALL2011 trial had a byzantine design, with the overarching goal of finding out which treatment and maintenance strategy best finds the sweet spot between efficacy and toxicity in children and young adults (up to age 25) with ALL and lymphoblastic lymphoma.

One question that was already answered, as investigators reported at the 2017 ASH annual meeting, came from the first randomization in the study, designed to see whether a shorter course of dexamethasone – 14 days versus the standard 28 days – could reduce induction toxicity. It did not.

Now, at ASH 2022, the investigators reported outcomes from the second phase of the trial, which included two randomizations: one comparing high-dose methotrexate with standard interim maintenance to reduce CNS relapse risk, and one to see whether forgoing pulses of vincristine/dexamethasone could reduce maintenance morbidity.

Patients were stratified by National Cancer Institute minimal residual disease (MRD) risk categories, cytogenetics, and end-of-induction MRD to receive one of three treatment regimens. Patients with MRD high risk, defined as MRD greater than 0.5% at the end of consolidation, were not eligible for second-phase randomization and instead received off-protocol therapies.The second randomization was factorial, stratified by NCI and MRD risk groups, resulting in four arms: high-dose methotrexate with or without pulses and standard interim maintenance with our without pulses.

Standard interim maintenance in this trial was 2 months of oral mercaptopurine/methotrexate monthly pulses and single intrathecal methotrexate in two of the regimens, as well as five doses of escalating intravenous methotrexate plus vincristine and two doses of pegylated asparaginase in the third.

High-dose methotrexate was given at a dose of 5 g/m² for four doses 2 weeks apart, low dose 6-mercaptopurine, plus two doses of pegylated asparaginase in one regimen only.
 

Equivocal conclusions

As noted above, CNS relapse, the primary endpoint for the interim maintenance randomization, did not differ between the groups, with identical 5-year relapse rates. Similarly, 5-year event-free survival (EFS) rates were 90.3% in the high-dose group and 89.5% in the standard group, a difference that was not statistically significant (P = .68).

There was, however, an interaction between the first (short- vs. standard-course dexamethasone) and the interim maintenance randomizations, indicating significantly inferior EFS outcomes for patients who had received the short dose of dexamethasone followed by high-dose methotrexate, especially among patients who did not receive pulses (P = .006).

An analysis of patients treated with standard dexamethasone showed that those who received high-dose methotrexate had a lower risk for bone marrow relapse, with a hazard ratio of 0.62 (P = .029), and trends, albeit nonsignificant, toward better EFS and overall survival.

In addition, the overall results suggested that steroid pulses could be safely omitted without leading to an increase in bone marrow relapses: the 5-year rates of bone marrow relapse were 10.2% with pulses and 12.2% without, although omitting pulses was associated with a slight but significant decrease in EFS overall (P = .01). The effect was attenuated among patients who had received standard-course dexamethasone and high-dose methotrexate. Leaving out the pulses also reduced rates of grade 3 or 4 adverse events, including febrile neutropenia, Ms. Kirkwood noted in her presentation.

The investigators plan to analyze quality-of-life outcomes related to dexamethasone-vincristine pulses to see whether doing so could tip the balance in favor of leaving them out of therapy, and they will continue to follow patients to see whether their findings hold.

UKALL2011 was funded by Children with Cancer UK, Blood Cancer UK, and Cancer Research UK. Ms. Kirkwood disclosed consulting for and receiving honoraria from Kite. Dr. Vora reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

In addition to the latest news in clinical care and drug development, some eyebrow-raising findings that challenge long-held, untested assumptions are promised from the annual meeting of the American Society of Hematology.

The conference starts in New Orleans on Saturday, Dec. 10, , but a sample of what is to come was given last week in a preview media briefing, moderated by Mikkael A. Sekeres, MD, from the University of Miami. Dr. Sekeres, who recently authored a book on the FDA and how it regulates drug approvals, also serves as chair of the ASH Committee on Communications.
 

“Feeding Our Patients Gruel”

Dr. Sekeres expressed particular excitement about a multicenter randomized trial done in Italy. It showed that patients who have neutropenia after a stem cell transplant need not be required to eat a bland diet (Abstract 169).

“We for years have been essentially feeding our patients gruel in the hospital, and these are folks who have to be hospitalized for a stem cell transplant or in my case – I’m a leukemia specialist – for acute leukemia, for 4-6 weeks. The neutropenic diet consists of the blandest food you can imagine, with nothing to really spice it up.”

He noted that a neutropenic diet is so unpalatable that family members often sneak food into patient rooms, and “for years we’ve never seen adverse outcomes in any of those folks who instead of having mashed potatoes and oatmeal ate a corned beef sandwich for dinner.”

Now, the results from this trial “actually give us license to finally allow patients to eat whatever they want,” Dr. Sekeres said.
 

Practice-changing data

ASH experts pointed to two more presentations that are expected to change clinical practice. These include the finding that high-dose methotrexate does not reduce the risk for central nervous system relapse in children with acute lymphoblastic leukemia and lymphoblastic lymphoma (Abstract 214).

Another new study that seems to defy conventional wisdom showed that in adults with relapsed or refractory acute myeloid leukemia, intensive chemotherapy in an effort to achieve remission before a stem cell transplant did not result in better outcomes, compared with sequential conditioning and immediate transplant (Abstract 4).
 

Premature aging in HL survivors

ASH President Jane N. Winter, MD, from Northwestern University, Chicago, who also spoke at the briefing, highlighted a study that followed adult survivors of pediatric Hodgkin lymphoma. This study, from St. Jude Children’s Research Hospital in Memphis and the Wilmot Cancer Institute at the University of Rochester (N.Y), found that these adult survivors are at significantly elevated risk for epigenetic age acceleration accompanied by neurocognitive deficits when compared with controls (Abstract 902).

“This is an area that is very near and dear to my heart,” she said. “Much of my career has focused on reducing the therapy to reduce the long-term consequences of treatments. Pediatricians have been very much wedded to very intensive therapies and tend to incorporate radiation more commonly in their treatment strategies for children than we do in adults.”

Dr. Winter noted that, although clinicians focus primarily on the link between mediastinal radiation and long-term adverse events such as breast cancer, “now we’re shedding a light on the neurocognitive deficits, which I think are underappreciated. Being able to screen for this impact of our treatment, and perhaps then develop strategies to deal with it or prevent it, will have very wide-ranging impact.”
 

Inherited thrombophilia and miscarriage

Cynthia E. Dunbar, MD, chief of the translational stem cell biology branch at the National Heart, Lung, and Blood Institute in Bethesda, Md., who also spoke at the briefing, said that one of the abstracts most important to her practice is a study concerning pregnancy. It showed that low-molecular-weight heparin did not prevent miscarriage in pregnant women with confirmed inherited thrombophilia who had two or more prior pregnancy losses, compared with standard surveillance (Abstract LBA-5).

“This is not my field at all; on the other hand, as a hematologist and a woman, that’s what my emails in the middle of the night and my panicked phone calls are often about. Once somebody has one miscarriage, especially if they feel like they’re already over 30 and the clock is ticking, there’s a huge emphasis and a huge amount of pressure on obstetricians to basically work up for everything, kind of a shotgun [approach],” she said.

Those workups may reveal genetic mutations that are associated with mild elevations in risk for clotting. As a result, some pregnant women are put on anticoagulation therapy, which can cause complications for both pregnancy and delivery. These study findings don’t solve the problem of spontaneous pregnancy loss, but they at least rule out inherited thrombophilia as a preventable cause of miscarriages, Dr. Dunbar said.

Another potentially practice-changing abstract is a study showing that, in younger adults with mantle cell lymphoma, the addition of the Bruton’s tyrosine kinase inhibitor ibrutinib (Imbruvica) to induction therapy and as maintenance with or without autologous stem cell transplant had strong efficacy and acceptable toxicity (Abstract 1).

“The results show that the ibrutinib-containing regimen without transplant is at least as good as the current standard of care with transplant.” Dr. Winter said. “Additional follow-up will be required to show definitively that an autotransplant is unnecessary if ibrutinib is included in this treatment regimen.”

A version of this article first appeared on Medscape.com.

In addition to the latest news in clinical care and drug development, some eyebrow-raising findings that challenge long-held, untested assumptions are promised from the annual meeting of the American Society of Hematology.

The conference starts in New Orleans on Saturday, Dec. 10, , but a sample of what is to come was given last week in a preview media briefing, moderated by Mikkael A. Sekeres, MD, from the University of Miami. Dr. Sekeres, who recently authored a book on the FDA and how it regulates drug approvals, also serves as chair of the ASH Committee on Communications.
 

“Feeding Our Patients Gruel”

Dr. Sekeres expressed particular excitement about a multicenter randomized trial done in Italy. It showed that patients who have neutropenia after a stem cell transplant need not be required to eat a bland diet (Abstract 169).

“We for years have been essentially feeding our patients gruel in the hospital, and these are folks who have to be hospitalized for a stem cell transplant or in my case – I’m a leukemia specialist – for acute leukemia, for 4-6 weeks. The neutropenic diet consists of the blandest food you can imagine, with nothing to really spice it up.”

He noted that a neutropenic diet is so unpalatable that family members often sneak food into patient rooms, and “for years we’ve never seen adverse outcomes in any of those folks who instead of having mashed potatoes and oatmeal ate a corned beef sandwich for dinner.”

Now, the results from this trial “actually give us license to finally allow patients to eat whatever they want,” Dr. Sekeres said.
 

Practice-changing data

ASH experts pointed to two more presentations that are expected to change clinical practice. These include the finding that high-dose methotrexate does not reduce the risk for central nervous system relapse in children with acute lymphoblastic leukemia and lymphoblastic lymphoma (Abstract 214).

Another new study that seems to defy conventional wisdom showed that in adults with relapsed or refractory acute myeloid leukemia, intensive chemotherapy in an effort to achieve remission before a stem cell transplant did not result in better outcomes, compared with sequential conditioning and immediate transplant (Abstract 4).
 

Premature aging in HL survivors

ASH President Jane N. Winter, MD, from Northwestern University, Chicago, who also spoke at the briefing, highlighted a study that followed adult survivors of pediatric Hodgkin lymphoma. This study, from St. Jude Children’s Research Hospital in Memphis and the Wilmot Cancer Institute at the University of Rochester (N.Y), found that these adult survivors are at significantly elevated risk for epigenetic age acceleration accompanied by neurocognitive deficits when compared with controls (Abstract 902).

“This is an area that is very near and dear to my heart,” she said. “Much of my career has focused on reducing the therapy to reduce the long-term consequences of treatments. Pediatricians have been very much wedded to very intensive therapies and tend to incorporate radiation more commonly in their treatment strategies for children than we do in adults.”

Dr. Winter noted that, although clinicians focus primarily on the link between mediastinal radiation and long-term adverse events such as breast cancer, “now we’re shedding a light on the neurocognitive deficits, which I think are underappreciated. Being able to screen for this impact of our treatment, and perhaps then develop strategies to deal with it or prevent it, will have very wide-ranging impact.”
 

Inherited thrombophilia and miscarriage

Cynthia E. Dunbar, MD, chief of the translational stem cell biology branch at the National Heart, Lung, and Blood Institute in Bethesda, Md., who also spoke at the briefing, said that one of the abstracts most important to her practice is a study concerning pregnancy. It showed that low-molecular-weight heparin did not prevent miscarriage in pregnant women with confirmed inherited thrombophilia who had two or more prior pregnancy losses, compared with standard surveillance (Abstract LBA-5).

“This is not my field at all; on the other hand, as a hematologist and a woman, that’s what my emails in the middle of the night and my panicked phone calls are often about. Once somebody has one miscarriage, especially if they feel like they’re already over 30 and the clock is ticking, there’s a huge emphasis and a huge amount of pressure on obstetricians to basically work up for everything, kind of a shotgun [approach],” she said.

Those workups may reveal genetic mutations that are associated with mild elevations in risk for clotting. As a result, some pregnant women are put on anticoagulation therapy, which can cause complications for both pregnancy and delivery. These study findings don’t solve the problem of spontaneous pregnancy loss, but they at least rule out inherited thrombophilia as a preventable cause of miscarriages, Dr. Dunbar said.

Another potentially practice-changing abstract is a study showing that, in younger adults with mantle cell lymphoma, the addition of the Bruton’s tyrosine kinase inhibitor ibrutinib (Imbruvica) to induction therapy and as maintenance with or without autologous stem cell transplant had strong efficacy and acceptable toxicity (Abstract 1).

“The results show that the ibrutinib-containing regimen without transplant is at least as good as the current standard of care with transplant.” Dr. Winter said. “Additional follow-up will be required to show definitively that an autotransplant is unnecessary if ibrutinib is included in this treatment regimen.”

A version of this article first appeared on Medscape.com.

In addition to the latest news in clinical care and drug development, some eyebrow-raising findings that challenge long-held, untested assumptions are promised from the annual meeting of the American Society of Hematology.

The conference starts in New Orleans on Saturday, Dec. 10, , but a sample of what is to come was given last week in a preview media briefing, moderated by Mikkael A. Sekeres, MD, from the University of Miami. Dr. Sekeres, who recently authored a book on the FDA and how it regulates drug approvals, also serves as chair of the ASH Committee on Communications.
 

“Feeding Our Patients Gruel”

Dr. Sekeres expressed particular excitement about a multicenter randomized trial done in Italy. It showed that patients who have neutropenia after a stem cell transplant need not be required to eat a bland diet (Abstract 169).

“We for years have been essentially feeding our patients gruel in the hospital, and these are folks who have to be hospitalized for a stem cell transplant or in my case – I’m a leukemia specialist – for acute leukemia, for 4-6 weeks. The neutropenic diet consists of the blandest food you can imagine, with nothing to really spice it up.”

He noted that a neutropenic diet is so unpalatable that family members often sneak food into patient rooms, and “for years we’ve never seen adverse outcomes in any of those folks who instead of having mashed potatoes and oatmeal ate a corned beef sandwich for dinner.”

Now, the results from this trial “actually give us license to finally allow patients to eat whatever they want,” Dr. Sekeres said.
 

Practice-changing data

ASH experts pointed to two more presentations that are expected to change clinical practice. These include the finding that high-dose methotrexate does not reduce the risk for central nervous system relapse in children with acute lymphoblastic leukemia and lymphoblastic lymphoma (Abstract 214).

Another new study that seems to defy conventional wisdom showed that in adults with relapsed or refractory acute myeloid leukemia, intensive chemotherapy in an effort to achieve remission before a stem cell transplant did not result in better outcomes, compared with sequential conditioning and immediate transplant (Abstract 4).
 

Premature aging in HL survivors

ASH President Jane N. Winter, MD, from Northwestern University, Chicago, who also spoke at the briefing, highlighted a study that followed adult survivors of pediatric Hodgkin lymphoma. This study, from St. Jude Children’s Research Hospital in Memphis and the Wilmot Cancer Institute at the University of Rochester (N.Y), found that these adult survivors are at significantly elevated risk for epigenetic age acceleration accompanied by neurocognitive deficits when compared with controls (Abstract 902).

“This is an area that is very near and dear to my heart,” she said. “Much of my career has focused on reducing the therapy to reduce the long-term consequences of treatments. Pediatricians have been very much wedded to very intensive therapies and tend to incorporate radiation more commonly in their treatment strategies for children than we do in adults.”

Dr. Winter noted that, although clinicians focus primarily on the link between mediastinal radiation and long-term adverse events such as breast cancer, “now we’re shedding a light on the neurocognitive deficits, which I think are underappreciated. Being able to screen for this impact of our treatment, and perhaps then develop strategies to deal with it or prevent it, will have very wide-ranging impact.”
 

Inherited thrombophilia and miscarriage

Cynthia E. Dunbar, MD, chief of the translational stem cell biology branch at the National Heart, Lung, and Blood Institute in Bethesda, Md., who also spoke at the briefing, said that one of the abstracts most important to her practice is a study concerning pregnancy. It showed that low-molecular-weight heparin did not prevent miscarriage in pregnant women with confirmed inherited thrombophilia who had two or more prior pregnancy losses, compared with standard surveillance (Abstract LBA-5).

“This is not my field at all; on the other hand, as a hematologist and a woman, that’s what my emails in the middle of the night and my panicked phone calls are often about. Once somebody has one miscarriage, especially if they feel like they’re already over 30 and the clock is ticking, there’s a huge emphasis and a huge amount of pressure on obstetricians to basically work up for everything, kind of a shotgun [approach],” she said.

Those workups may reveal genetic mutations that are associated with mild elevations in risk for clotting. As a result, some pregnant women are put on anticoagulation therapy, which can cause complications for both pregnancy and delivery. These study findings don’t solve the problem of spontaneous pregnancy loss, but they at least rule out inherited thrombophilia as a preventable cause of miscarriages, Dr. Dunbar said.

Another potentially practice-changing abstract is a study showing that, in younger adults with mantle cell lymphoma, the addition of the Bruton’s tyrosine kinase inhibitor ibrutinib (Imbruvica) to induction therapy and as maintenance with or without autologous stem cell transplant had strong efficacy and acceptable toxicity (Abstract 1).

“The results show that the ibrutinib-containing regimen without transplant is at least as good as the current standard of care with transplant.” Dr. Winter said. “Additional follow-up will be required to show definitively that an autotransplant is unnecessary if ibrutinib is included in this treatment regimen.”

A version of this article first appeared on Medscape.com.

A novel approach in which two products were co-administered achieved a 99% complete response rate in children with relapsed or treatment-resistant B-cell acute lymphoblastic leukemia (B-ALL).

In this trial, the largest study to date of a CAR T-cell therapy for such patients, the researchers co-administered two CAR T-cell therapies, one targeting CD19 and the other targeting CD22.

The results showed that 192 of 194 patients (99%) achieved a complete remission.

The combined overall 12-month event-free survival was 73.5%.

The study was published online in the Journal of Clinical Oncology.

These results are better than what has been reported for CAR T cells that are already on the market. These products, which target CD19, have achieved complete remission in 85.5% of cases and a 12-month event-free survival of 52.4% in children with B-ALL.

“We do believe [this approach] will become standard of care,” said study author Ching-Hon Pui, MD, of the departments of oncology, pathology, and global pediatric medicine, St. Jude Children’s Research Hospital, Memphis.

He noted that this work builds on the huge success that has already been achieved in this field with CAR T-cell products directed at CD19. The first of these products to reach the market was tisagenlecleucel-T (Novartis).

“To put this study in context, the first child who received CAR T-cell therapy for B-ALL after multiple relapses has recently celebrated her 10-year cancer-free survival milestone, and we hope that our finding will result in many more such milestones,” he said.

These new results are very impressive, said Stephen P. Hunger, MD, an expert commenting for the American Society of Clinical Oncology, which highlighted the research in a press release. “They were also able to treat almost 200 patients in a relatively short time.”

Hunger pointed out that dual administration and targeting is not a new idea and is one of the strategies that is currently under investigation. But it is too early to consider this to be the standard of care, he said. “We want to see it replicated in other centers and to see longer follow-up,” said Dr. Hunger, who is Distinguished Chair in Pediatrics and director of the center for childhood cancer research at Children’s Hospital of Philadelphia. “We can establish this as a first step down the road, and we will see if others will achieve similar results.”
 

Strategy of dual targeting

Despite the success CAR T-cell therapy in childhood leukemia, the currently available products have limitations, Dr. Pui and colleagues note.

About half of patients treated with CD19 CAR T cells experience relapse within 1 year, owing either to loss of CAR T-cell persistence or to loss of CD19 antigen because of splice variants, acquired genetic mutations, or lineage switch.

With further treatment with CAR T cells directed against CD22, 70%-80% of patients who failed CD19 CAR T will achieve into complete remission. However, most will experience relapse.

Recent efforts in the field have turned to exploring the safety and feasibility of CAR T cells that target both CD19 and CD22. The results were not superior to those of the CD19 CAR T-cell therapy given alone, although sequential treatment has yielded promising response rates, the authors note.

They hypothesized that co-administration of CD19- and CD22-targeted CAR T cells would improve efficacy, as it could forestall the development of drug resistance.
 

Achieved 99% remission

Dr. Pui and colleagues conducted a phase 2 trial that included 225 evaluable patients aged 20 years or younger who were being treated at five urban hospitals in and near Shanghai, China. Of this group, 194 had refractory disease or hematologic relapse, and 31 patients had isolated extramedullary relapse.

A safety run-in stage to determine the recommended dose was initially conducted. An interim analysis of the first 30 patients who were treated (27 at the recommended dose) showed that the approach was safe and effective. Additional patients were then enrolled.

The 192 patients (of 194) who achieved complete remission attained negative minimal residual disease status.

At a median follow-up of 11 months, 43 patients experienced relapse (24 with CD191/CD221 relapse, 16 with CD19– /CD221, one with CD19– /CD22– , and two unknown), for a cumulative risk of 22.2%.
 

Transplant and relapse options

In an interview, Dr. Pui noted that various treatment options were available for the children who experienced relapse. “For patients who were in good clinical condition, we will treat them with molecular therapeutics, allogeneic CAR T cells from donor, or even repeated humanized CD19 and/or CD22 CAR T cells with or without CD20 CAR T cells in an attempt to induce a remission for allogeneic transplantation,” he said.

The site-specific 12-month event-free survival rate in the trial was 69.2% for patients who did not receive a transplant, 95% for those children who had an isolated relapse to the testicles, and 68.6% for those who had an isolated central nervous system relapse.

After censoring 78 patients for consolidative transplantation, the 12-month overall survival was 87.7%.

Consolidative transplantation was performed in 24 of the 37 patients with KMT2A-rearranged or ZNF384-rearranged ALL and in 54 patients because of parental request. The reason for this was that patients with these two genetic subtypes of leukemia (KMT2A-rearranged and ZNF384-rearranged), under the pressure of phenotype-specific treatment (such as CAR T cells or blinatumomab) are at risk of lineage switch and development of secondary acute myeloid leukemia, explained Dr. Pui. “That is an even more resistant form of leukemia, and up to 5%-10% of the patients have been reported to develop this complication.

“We performed consolidation transplantation in these patients to avoid the risk of lineage switch but would accept the parental request not to perform allogeneic transplant after they were clearly informed of the risk,” he told this news organization.

He also suggested that this approach of co-administration of two types of CAR T cells would be especially suitable for “patients with extramedullary involvement, because most of them will be spared of local irradiation so that they can preserve their neurocognitive function and fertility and avoid radiation-induced second cancer, such as brain tumor,” he said.
 

Lower toxicity

With regard to toxicity, the majority of patients (n = 98, 88%) developed cytokine release syndrome, which was grade ≥3 in 64 (28.4%) patients and fatal in one. Neurotoxicity occurred in 47 (20.9%) patients, was of grade ≥3 in 9 (4.0%) patients, and was fatal in 2 patients who received 12 x 106 and 5.6 x 106 CAR T cells/kg.

In addition, grade 3 or 4 seizure developed in 14.2% of the patients; it was more common in those who had presented with isolated or combined CNS leukemia. Grade 3 or 4 hypotension occurred in 40.9% of the patients. About three-quarters of the patients were treated with tocilizumab (n = 67, 74.2%), and 79 (35.1%) were treated with corticosteroids.

“In general, CD19 and CD22 CAR T cells were less toxic than CD19 CAR T cells, the historical controls, in our experience,” said Dr. Pui. “There were three fatal complications, a rate not excessive considering a large number of patients were treated.”
 

Future studies needed

The researchers note that in this trial, the CD22 CAR T cells did not expand as robustly or persist as long as did the CD19 CAR T cells, and they hope that future studies will elucidate whether enhancing CD22 CAR T-cell persistence and activity would further improve outcomes.

The study was supported in part by the National Natural Science Foundation of China, the Shanghai Collaborative Innovation Center for Translational Medicine, the Research Programs of Shanghai Science, the Technology Commission Foundation, the U.S. National Cancer Institute, the VIVA China Children’s Cancer Foundation, and the American Lebanese Syrian Associated Charities.

A version of this article first appeared on Medscape.com.

A novel approach in which two products were co-administered achieved a 99% complete response rate in children with relapsed or treatment-resistant B-cell acute lymphoblastic leukemia (B-ALL).

In this trial, the largest study to date of a CAR T-cell therapy for such patients, the researchers co-administered two CAR T-cell therapies, one targeting CD19 and the other targeting CD22.

The results showed that 192 of 194 patients (99%) achieved a complete remission.

The combined overall 12-month event-free survival was 73.5%.

The study was published online in the Journal of Clinical Oncology.

These results are better than what has been reported for CAR T cells that are already on the market. These products, which target CD19, have achieved complete remission in 85.5% of cases and a 12-month event-free survival of 52.4% in children with B-ALL.

“We do believe [this approach] will become standard of care,” said study author Ching-Hon Pui, MD, of the departments of oncology, pathology, and global pediatric medicine, St. Jude Children’s Research Hospital, Memphis.

He noted that this work builds on the huge success that has already been achieved in this field with CAR T-cell products directed at CD19. The first of these products to reach the market was tisagenlecleucel-T (Novartis).

“To put this study in context, the first child who received CAR T-cell therapy for B-ALL after multiple relapses has recently celebrated her 10-year cancer-free survival milestone, and we hope that our finding will result in many more such milestones,” he said.

These new results are very impressive, said Stephen P. Hunger, MD, an expert commenting for the American Society of Clinical Oncology, which highlighted the research in a press release. “They were also able to treat almost 200 patients in a relatively short time.”

Hunger pointed out that dual administration and targeting is not a new idea and is one of the strategies that is currently under investigation. But it is too early to consider this to be the standard of care, he said. “We want to see it replicated in other centers and to see longer follow-up,” said Dr. Hunger, who is Distinguished Chair in Pediatrics and director of the center for childhood cancer research at Children’s Hospital of Philadelphia. “We can establish this as a first step down the road, and we will see if others will achieve similar results.”
 

Strategy of dual targeting

Despite the success CAR T-cell therapy in childhood leukemia, the currently available products have limitations, Dr. Pui and colleagues note.

About half of patients treated with CD19 CAR T cells experience relapse within 1 year, owing either to loss of CAR T-cell persistence or to loss of CD19 antigen because of splice variants, acquired genetic mutations, or lineage switch.

With further treatment with CAR T cells directed against CD22, 70%-80% of patients who failed CD19 CAR T will achieve into complete remission. However, most will experience relapse.

Recent efforts in the field have turned to exploring the safety and feasibility of CAR T cells that target both CD19 and CD22. The results were not superior to those of the CD19 CAR T-cell therapy given alone, although sequential treatment has yielded promising response rates, the authors note.

They hypothesized that co-administration of CD19- and CD22-targeted CAR T cells would improve efficacy, as it could forestall the development of drug resistance.
 

Achieved 99% remission

Dr. Pui and colleagues conducted a phase 2 trial that included 225 evaluable patients aged 20 years or younger who were being treated at five urban hospitals in and near Shanghai, China. Of this group, 194 had refractory disease or hematologic relapse, and 31 patients had isolated extramedullary relapse.

A safety run-in stage to determine the recommended dose was initially conducted. An interim analysis of the first 30 patients who were treated (27 at the recommended dose) showed that the approach was safe and effective. Additional patients were then enrolled.

The 192 patients (of 194) who achieved complete remission attained negative minimal residual disease status.

At a median follow-up of 11 months, 43 patients experienced relapse (24 with CD191/CD221 relapse, 16 with CD19– /CD221, one with CD19– /CD22– , and two unknown), for a cumulative risk of 22.2%.
 

Transplant and relapse options

In an interview, Dr. Pui noted that various treatment options were available for the children who experienced relapse. “For patients who were in good clinical condition, we will treat them with molecular therapeutics, allogeneic CAR T cells from donor, or even repeated humanized CD19 and/or CD22 CAR T cells with or without CD20 CAR T cells in an attempt to induce a remission for allogeneic transplantation,” he said.

The site-specific 12-month event-free survival rate in the trial was 69.2% for patients who did not receive a transplant, 95% for those children who had an isolated relapse to the testicles, and 68.6% for those who had an isolated central nervous system relapse.

After censoring 78 patients for consolidative transplantation, the 12-month overall survival was 87.7%.

Consolidative transplantation was performed in 24 of the 37 patients with KMT2A-rearranged or ZNF384-rearranged ALL and in 54 patients because of parental request. The reason for this was that patients with these two genetic subtypes of leukemia (KMT2A-rearranged and ZNF384-rearranged), under the pressure of phenotype-specific treatment (such as CAR T cells or blinatumomab) are at risk of lineage switch and development of secondary acute myeloid leukemia, explained Dr. Pui. “That is an even more resistant form of leukemia, and up to 5%-10% of the patients have been reported to develop this complication.

“We performed consolidation transplantation in these patients to avoid the risk of lineage switch but would accept the parental request not to perform allogeneic transplant after they were clearly informed of the risk,” he told this news organization.

He also suggested that this approach of co-administration of two types of CAR T cells would be especially suitable for “patients with extramedullary involvement, because most of them will be spared of local irradiation so that they can preserve their neurocognitive function and fertility and avoid radiation-induced second cancer, such as brain tumor,” he said.
 

Lower toxicity

With regard to toxicity, the majority of patients (n = 98, 88%) developed cytokine release syndrome, which was grade ≥3 in 64 (28.4%) patients and fatal in one. Neurotoxicity occurred in 47 (20.9%) patients, was of grade ≥3 in 9 (4.0%) patients, and was fatal in 2 patients who received 12 x 106 and 5.6 x 106 CAR T cells/kg.

In addition, grade 3 or 4 seizure developed in 14.2% of the patients; it was more common in those who had presented with isolated or combined CNS leukemia. Grade 3 or 4 hypotension occurred in 40.9% of the patients. About three-quarters of the patients were treated with tocilizumab (n = 67, 74.2%), and 79 (35.1%) were treated with corticosteroids.

“In general, CD19 and CD22 CAR T cells were less toxic than CD19 CAR T cells, the historical controls, in our experience,” said Dr. Pui. “There were three fatal complications, a rate not excessive considering a large number of patients were treated.”
 

Future studies needed

The researchers note that in this trial, the CD22 CAR T cells did not expand as robustly or persist as long as did the CD19 CAR T cells, and they hope that future studies will elucidate whether enhancing CD22 CAR T-cell persistence and activity would further improve outcomes.

The study was supported in part by the National Natural Science Foundation of China, the Shanghai Collaborative Innovation Center for Translational Medicine, the Research Programs of Shanghai Science, the Technology Commission Foundation, the U.S. National Cancer Institute, the VIVA China Children’s Cancer Foundation, and the American Lebanese Syrian Associated Charities.

A version of this article first appeared on Medscape.com.

A novel approach in which two products were co-administered achieved a 99% complete response rate in children with relapsed or treatment-resistant B-cell acute lymphoblastic leukemia (B-ALL).

In this trial, the largest study to date of a CAR T-cell therapy for such patients, the researchers co-administered two CAR T-cell therapies, one targeting CD19 and the other targeting CD22.

The results showed that 192 of 194 patients (99%) achieved a complete remission.

The combined overall 12-month event-free survival was 73.5%.

The study was published online in the Journal of Clinical Oncology.

These results are better than what has been reported for CAR T cells that are already on the market. These products, which target CD19, have achieved complete remission in 85.5% of cases and a 12-month event-free survival of 52.4% in children with B-ALL.

“We do believe [this approach] will become standard of care,” said study author Ching-Hon Pui, MD, of the departments of oncology, pathology, and global pediatric medicine, St. Jude Children’s Research Hospital, Memphis.

He noted that this work builds on the huge success that has already been achieved in this field with CAR T-cell products directed at CD19. The first of these products to reach the market was tisagenlecleucel-T (Novartis).

“To put this study in context, the first child who received CAR T-cell therapy for B-ALL after multiple relapses has recently celebrated her 10-year cancer-free survival milestone, and we hope that our finding will result in many more such milestones,” he said.

These new results are very impressive, said Stephen P. Hunger, MD, an expert commenting for the American Society of Clinical Oncology, which highlighted the research in a press release. “They were also able to treat almost 200 patients in a relatively short time.”

Hunger pointed out that dual administration and targeting is not a new idea and is one of the strategies that is currently under investigation. But it is too early to consider this to be the standard of care, he said. “We want to see it replicated in other centers and to see longer follow-up,” said Dr. Hunger, who is Distinguished Chair in Pediatrics and director of the center for childhood cancer research at Children’s Hospital of Philadelphia. “We can establish this as a first step down the road, and we will see if others will achieve similar results.”
 

Strategy of dual targeting

Despite the success CAR T-cell therapy in childhood leukemia, the currently available products have limitations, Dr. Pui and colleagues note.

About half of patients treated with CD19 CAR T cells experience relapse within 1 year, owing either to loss of CAR T-cell persistence or to loss of CD19 antigen because of splice variants, acquired genetic mutations, or lineage switch.

With further treatment with CAR T cells directed against CD22, 70%-80% of patients who failed CD19 CAR T will achieve into complete remission. However, most will experience relapse.

Recent efforts in the field have turned to exploring the safety and feasibility of CAR T cells that target both CD19 and CD22. The results were not superior to those of the CD19 CAR T-cell therapy given alone, although sequential treatment has yielded promising response rates, the authors note.

They hypothesized that co-administration of CD19- and CD22-targeted CAR T cells would improve efficacy, as it could forestall the development of drug resistance.
 

Achieved 99% remission

Dr. Pui and colleagues conducted a phase 2 trial that included 225 evaluable patients aged 20 years or younger who were being treated at five urban hospitals in and near Shanghai, China. Of this group, 194 had refractory disease or hematologic relapse, and 31 patients had isolated extramedullary relapse.

A safety run-in stage to determine the recommended dose was initially conducted. An interim analysis of the first 30 patients who were treated (27 at the recommended dose) showed that the approach was safe and effective. Additional patients were then enrolled.

The 192 patients (of 194) who achieved complete remission attained negative minimal residual disease status.

At a median follow-up of 11 months, 43 patients experienced relapse (24 with CD191/CD221 relapse, 16 with CD19– /CD221, one with CD19– /CD22– , and two unknown), for a cumulative risk of 22.2%.
 

Transplant and relapse options

In an interview, Dr. Pui noted that various treatment options were available for the children who experienced relapse. “For patients who were in good clinical condition, we will treat them with molecular therapeutics, allogeneic CAR T cells from donor, or even repeated humanized CD19 and/or CD22 CAR T cells with or without CD20 CAR T cells in an attempt to induce a remission for allogeneic transplantation,” he said.

The site-specific 12-month event-free survival rate in the trial was 69.2% for patients who did not receive a transplant, 95% for those children who had an isolated relapse to the testicles, and 68.6% for those who had an isolated central nervous system relapse.

After censoring 78 patients for consolidative transplantation, the 12-month overall survival was 87.7%.

Consolidative transplantation was performed in 24 of the 37 patients with KMT2A-rearranged or ZNF384-rearranged ALL and in 54 patients because of parental request. The reason for this was that patients with these two genetic subtypes of leukemia (KMT2A-rearranged and ZNF384-rearranged), under the pressure of phenotype-specific treatment (such as CAR T cells or blinatumomab) are at risk of lineage switch and development of secondary acute myeloid leukemia, explained Dr. Pui. “That is an even more resistant form of leukemia, and up to 5%-10% of the patients have been reported to develop this complication.

“We performed consolidation transplantation in these patients to avoid the risk of lineage switch but would accept the parental request not to perform allogeneic transplant after they were clearly informed of the risk,” he told this news organization.

He also suggested that this approach of co-administration of two types of CAR T cells would be especially suitable for “patients with extramedullary involvement, because most of them will be spared of local irradiation so that they can preserve their neurocognitive function and fertility and avoid radiation-induced second cancer, such as brain tumor,” he said.
 

Lower toxicity

With regard to toxicity, the majority of patients (n = 98, 88%) developed cytokine release syndrome, which was grade ≥3 in 64 (28.4%) patients and fatal in one. Neurotoxicity occurred in 47 (20.9%) patients, was of grade ≥3 in 9 (4.0%) patients, and was fatal in 2 patients who received 12 x 106 and 5.6 x 106 CAR T cells/kg.

In addition, grade 3 or 4 seizure developed in 14.2% of the patients; it was more common in those who had presented with isolated or combined CNS leukemia. Grade 3 or 4 hypotension occurred in 40.9% of the patients. About three-quarters of the patients were treated with tocilizumab (n = 67, 74.2%), and 79 (35.1%) were treated with corticosteroids.

“In general, CD19 and CD22 CAR T cells were less toxic than CD19 CAR T cells, the historical controls, in our experience,” said Dr. Pui. “There were three fatal complications, a rate not excessive considering a large number of patients were treated.”
 

Future studies needed

The researchers note that in this trial, the CD22 CAR T cells did not expand as robustly or persist as long as did the CD19 CAR T cells, and they hope that future studies will elucidate whether enhancing CD22 CAR T-cell persistence and activity would further improve outcomes.

The study was supported in part by the National Natural Science Foundation of China, the Shanghai Collaborative Innovation Center for Translational Medicine, the Research Programs of Shanghai Science, the Technology Commission Foundation, the U.S. National Cancer Institute, the VIVA China Children’s Cancer Foundation, and the American Lebanese Syrian Associated Charities.

A version of this article first appeared on Medscape.com.

While great strides have been made in children’s leukemia care during the past 50 years, statistics have remained grim. For acute myeloid leukemia (AML), the most common type, 5-year survival rates were just 69% for children younger than 15 between 2009 and 2015. Patients who do survive past adolescence face high risks of future complications.

Specialists say the challenges hindering more progress include a lack of clinical research, an emphasis on competition over cooperation, and sparse insight into how best to adjust adult leukemia treatments to children. Now, a large clinical trial launched by the Leukemia & Lymphoma Society (LLS) seeks to revolutionize pediatric AML care by testing multiple experimental treatments across the globe. Its goal goes beyond simply boosting survival.

“Our project aims to find better treatments, more targeted treatments, that will leave children with fewer long-term health problems as adults. We want them to not just survive but thrive,” Gwen Nichols, MD, chief medical officer of LLS, said in an interview. “What we’ve had was not working for anybody. So we have to try a different approach.”

The LLS Pediatric Acute Leukemia (PedAL) Master Trial launched in spring of 2022. Seventy-five study locations from Nova Scotia to Hawaii are now recruiting patients up to age 22 with known or suspected relapsed/refractory AML, mixed phenotype acute leukemia, or relapsed acute lymphoblastic leukemia (ALL).

The 5-year trial expects to recruit 960 participants in the United States and Canada. Clinics in Europe, Australia, and New Zealand also are taking part.

“Pediatric oncologists should know that PedAL, for the first time, is providing a cooperative, seamless way to interrogate [the genomics of] a child’s leukemia,” hematologist/oncologist Todd Cooper, DO, section chief of pediatric oncology at Seattle Children’s Cancer and Blood Disorders Center, said in an interview. “It is also providing a seamless and efficient way for children to be assigned to clinical trials that are going to be tailored towards a particular child’s leukemia. This is something that’s never been done.”

In North America, all trial participants with relapsed AML will undergo genetic sequencing for free as part of the screening process. Clinics “can’t always access genomic screening for their patients,” Dr. Nichols said. “We’re providing that even if they don’t participate in any other part of the trial, even if they go and get another available therapy or go on a different trial. We want them to know that this is available, and they will get the results. And if they’re looking for a trial when they get those results, we have trained oncology nurses who will help them navigate and find clinical trials.”

In PedAL itself, one subtrial is now in progress: An open-label phase 3 randomized multicenter analysis of whether the oral leukemia drug venetoclax combined with the intensive infused chemotherapy treatment FLA+GO (fludarabine, high-dose cytarabine, and gemtuzumab ozogamicin) will improve overall survival compared to FLA+GO alone. Ninety-eight subjects are expected to join the 5-year subtrial.

“We expect within the next year to open three or four different subtrials of targeted therapies for specific groups of patients,” E. Anders Kolb, MD, chief of oncology and hematology at Nemours Children’s Health in Delaware and cochair of the PedAL trial, said in an interview. “Over the course of the next few years, we’re going to learn a lot about the natural history of relapsed leukemia – we don’t have a ton of data on that – and then how targeted therapies may alter some of those outcomes.”

Discussions with multiple drugmakers are in progress regarding the potential subtrials, he said.

The PedAL strategy addresses the lack of new drugs for children with AML, Seattle Children’s Dr. Cooper said. One main reason for the gap is that childhood leukemia is much less common than the adult form, he said, so a lot of drug development is geared toward adults. As a result, he said, new drugs “are geared towards adults whose leukemia is not as aggressive. Whereas in children, the acute leukemias, especially AML, are quite aggressive and need therapies that are often more intense.”

In addition, he said, “we have only recently become aware of how AML is biologically much different than in adults.”

In AML, Delaware’s Dr. Kolb explained, “there are many different phenotypes – ways that these cells can look and behave. But we treat them with a single regimen. What I like to tell families is that we’ve got a few tools in our toolbox, but they all happen to be sledgehammers. The key to the challenge in AML is that it is a molecular disease, but we’re treating it with therapies that were developed 40-50 years ago.”

In PedAL, the goal is to figure out the best ways to target therapy for the specific types that patients have. On this front, the genomic screening in the trial is crucial because it will identify which patients express certain targets and allow them to be assigned to appropriate sub-trials, Dr. Coooper said.

What’s next? “LLS has planned for this to be ongoing for the next 5 to 7 years, so that we can get a number of studies up and running,” Dr. Nichols said. “After that, those studies will continue. We will hope that most of them can be self-funded by then.”

As for cost, she noted that the PedAL trial is part of the society’s Dare to Dream Project, formerly known as the Children’s Initiative, which focuses on pediatric blood cancers. The project, with a fundraising goal of $175 million, focuses on research, patient services and survivorship.

”We have a whole range of services, travel assistance, copay programs and educational resources that doctors may want to use as a valid source of information,” she said. ‘When I was in practice, patients were always asking me, ‘Do you have anything I can read or take home to give my son something about his disease?’ LLS has good-quality, patient-level information for patients. We welcome people contacting us or going to our website and taking advantage of that for free.”

Dr. Nichols and Dr. Kolb report no disclosures. Dr. Cooper reports academic funding from LLS.

While great strides have been made in children’s leukemia care during the past 50 years, statistics have remained grim. For acute myeloid leukemia (AML), the most common type, 5-year survival rates were just 69% for children younger than 15 between 2009 and 2015. Patients who do survive past adolescence face high risks of future complications.

Specialists say the challenges hindering more progress include a lack of clinical research, an emphasis on competition over cooperation, and sparse insight into how best to adjust adult leukemia treatments to children. Now, a large clinical trial launched by the Leukemia & Lymphoma Society (LLS) seeks to revolutionize pediatric AML care by testing multiple experimental treatments across the globe. Its goal goes beyond simply boosting survival.

“Our project aims to find better treatments, more targeted treatments, that will leave children with fewer long-term health problems as adults. We want them to not just survive but thrive,” Gwen Nichols, MD, chief medical officer of LLS, said in an interview. “What we’ve had was not working for anybody. So we have to try a different approach.”

The LLS Pediatric Acute Leukemia (PedAL) Master Trial launched in spring of 2022. Seventy-five study locations from Nova Scotia to Hawaii are now recruiting patients up to age 22 with known or suspected relapsed/refractory AML, mixed phenotype acute leukemia, or relapsed acute lymphoblastic leukemia (ALL).

The 5-year trial expects to recruit 960 participants in the United States and Canada. Clinics in Europe, Australia, and New Zealand also are taking part.

“Pediatric oncologists should know that PedAL, for the first time, is providing a cooperative, seamless way to interrogate [the genomics of] a child’s leukemia,” hematologist/oncologist Todd Cooper, DO, section chief of pediatric oncology at Seattle Children’s Cancer and Blood Disorders Center, said in an interview. “It is also providing a seamless and efficient way for children to be assigned to clinical trials that are going to be tailored towards a particular child’s leukemia. This is something that’s never been done.”

In North America, all trial participants with relapsed AML will undergo genetic sequencing for free as part of the screening process. Clinics “can’t always access genomic screening for their patients,” Dr. Nichols said. “We’re providing that even if they don’t participate in any other part of the trial, even if they go and get another available therapy or go on a different trial. We want them to know that this is available, and they will get the results. And if they’re looking for a trial when they get those results, we have trained oncology nurses who will help them navigate and find clinical trials.”

In PedAL itself, one subtrial is now in progress: An open-label phase 3 randomized multicenter analysis of whether the oral leukemia drug venetoclax combined with the intensive infused chemotherapy treatment FLA+GO (fludarabine, high-dose cytarabine, and gemtuzumab ozogamicin) will improve overall survival compared to FLA+GO alone. Ninety-eight subjects are expected to join the 5-year subtrial.

“We expect within the next year to open three or four different subtrials of targeted therapies for specific groups of patients,” E. Anders Kolb, MD, chief of oncology and hematology at Nemours Children’s Health in Delaware and cochair of the PedAL trial, said in an interview. “Over the course of the next few years, we’re going to learn a lot about the natural history of relapsed leukemia – we don’t have a ton of data on that – and then how targeted therapies may alter some of those outcomes.”

Discussions with multiple drugmakers are in progress regarding the potential subtrials, he said.

The PedAL strategy addresses the lack of new drugs for children with AML, Seattle Children’s Dr. Cooper said. One main reason for the gap is that childhood leukemia is much less common than the adult form, he said, so a lot of drug development is geared toward adults. As a result, he said, new drugs “are geared towards adults whose leukemia is not as aggressive. Whereas in children, the acute leukemias, especially AML, are quite aggressive and need therapies that are often more intense.”

In addition, he said, “we have only recently become aware of how AML is biologically much different than in adults.”

In AML, Delaware’s Dr. Kolb explained, “there are many different phenotypes – ways that these cells can look and behave. But we treat them with a single regimen. What I like to tell families is that we’ve got a few tools in our toolbox, but they all happen to be sledgehammers. The key to the challenge in AML is that it is a molecular disease, but we’re treating it with therapies that were developed 40-50 years ago.”

In PedAL, the goal is to figure out the best ways to target therapy for the specific types that patients have. On this front, the genomic screening in the trial is crucial because it will identify which patients express certain targets and allow them to be assigned to appropriate sub-trials, Dr. Coooper said.

What’s next? “LLS has planned for this to be ongoing for the next 5 to 7 years, so that we can get a number of studies up and running,” Dr. Nichols said. “After that, those studies will continue. We will hope that most of them can be self-funded by then.”

As for cost, she noted that the PedAL trial is part of the society’s Dare to Dream Project, formerly known as the Children’s Initiative, which focuses on pediatric blood cancers. The project, with a fundraising goal of $175 million, focuses on research, patient services and survivorship.

”We have a whole range of services, travel assistance, copay programs and educational resources that doctors may want to use as a valid source of information,” she said. ‘When I was in practice, patients were always asking me, ‘Do you have anything I can read or take home to give my son something about his disease?’ LLS has good-quality, patient-level information for patients. We welcome people contacting us or going to our website and taking advantage of that for free.”

Dr. Nichols and Dr. Kolb report no disclosures. Dr. Cooper reports academic funding from LLS.

While great strides have been made in children’s leukemia care during the past 50 years, statistics have remained grim. For acute myeloid leukemia (AML), the most common type, 5-year survival rates were just 69% for children younger than 15 between 2009 and 2015. Patients who do survive past adolescence face high risks of future complications.

Specialists say the challenges hindering more progress include a lack of clinical research, an emphasis on competition over cooperation, and sparse insight into how best to adjust adult leukemia treatments to children. Now, a large clinical trial launched by the Leukemia & Lymphoma Society (LLS) seeks to revolutionize pediatric AML care by testing multiple experimental treatments across the globe. Its goal goes beyond simply boosting survival.

“Our project aims to find better treatments, more targeted treatments, that will leave children with fewer long-term health problems as adults. We want them to not just survive but thrive,” Gwen Nichols, MD, chief medical officer of LLS, said in an interview. “What we’ve had was not working for anybody. So we have to try a different approach.”

The LLS Pediatric Acute Leukemia (PedAL) Master Trial launched in spring of 2022. Seventy-five study locations from Nova Scotia to Hawaii are now recruiting patients up to age 22 with known or suspected relapsed/refractory AML, mixed phenotype acute leukemia, or relapsed acute lymphoblastic leukemia (ALL).

The 5-year trial expects to recruit 960 participants in the United States and Canada. Clinics in Europe, Australia, and New Zealand also are taking part.

“Pediatric oncologists should know that PedAL, for the first time, is providing a cooperative, seamless way to interrogate [the genomics of] a child’s leukemia,” hematologist/oncologist Todd Cooper, DO, section chief of pediatric oncology at Seattle Children’s Cancer and Blood Disorders Center, said in an interview. “It is also providing a seamless and efficient way for children to be assigned to clinical trials that are going to be tailored towards a particular child’s leukemia. This is something that’s never been done.”

In North America, all trial participants with relapsed AML will undergo genetic sequencing for free as part of the screening process. Clinics “can’t always access genomic screening for their patients,” Dr. Nichols said. “We’re providing that even if they don’t participate in any other part of the trial, even if they go and get another available therapy or go on a different trial. We want them to know that this is available, and they will get the results. And if they’re looking for a trial when they get those results, we have trained oncology nurses who will help them navigate and find clinical trials.”

In PedAL itself, one subtrial is now in progress: An open-label phase 3 randomized multicenter analysis of whether the oral leukemia drug venetoclax combined with the intensive infused chemotherapy treatment FLA+GO (fludarabine, high-dose cytarabine, and gemtuzumab ozogamicin) will improve overall survival compared to FLA+GO alone. Ninety-eight subjects are expected to join the 5-year subtrial.

“We expect within the next year to open three or four different subtrials of targeted therapies for specific groups of patients,” E. Anders Kolb, MD, chief of oncology and hematology at Nemours Children’s Health in Delaware and cochair of the PedAL trial, said in an interview. “Over the course of the next few years, we’re going to learn a lot about the natural history of relapsed leukemia – we don’t have a ton of data on that – and then how targeted therapies may alter some of those outcomes.”

Discussions with multiple drugmakers are in progress regarding the potential subtrials, he said.

The PedAL strategy addresses the lack of new drugs for children with AML, Seattle Children’s Dr. Cooper said. One main reason for the gap is that childhood leukemia is much less common than the adult form, he said, so a lot of drug development is geared toward adults. As a result, he said, new drugs “are geared towards adults whose leukemia is not as aggressive. Whereas in children, the acute leukemias, especially AML, are quite aggressive and need therapies that are often more intense.”

In addition, he said, “we have only recently become aware of how AML is biologically much different than in adults.”

In AML, Delaware’s Dr. Kolb explained, “there are many different phenotypes – ways that these cells can look and behave. But we treat them with a single regimen. What I like to tell families is that we’ve got a few tools in our toolbox, but they all happen to be sledgehammers. The key to the challenge in AML is that it is a molecular disease, but we’re treating it with therapies that were developed 40-50 years ago.”

In PedAL, the goal is to figure out the best ways to target therapy for the specific types that patients have. On this front, the genomic screening in the trial is crucial because it will identify which patients express certain targets and allow them to be assigned to appropriate sub-trials, Dr. Coooper said.

What’s next? “LLS has planned for this to be ongoing for the next 5 to 7 years, so that we can get a number of studies up and running,” Dr. Nichols said. “After that, those studies will continue. We will hope that most of them can be self-funded by then.”

As for cost, she noted that the PedAL trial is part of the society’s Dare to Dream Project, formerly known as the Children’s Initiative, which focuses on pediatric blood cancers. The project, with a fundraising goal of $175 million, focuses on research, patient services and survivorship.

”We have a whole range of services, travel assistance, copay programs and educational resources that doctors may want to use as a valid source of information,” she said. ‘When I was in practice, patients were always asking me, ‘Do you have anything I can read or take home to give my son something about his disease?’ LLS has good-quality, patient-level information for patients. We welcome people contacting us or going to our website and taking advantage of that for free.”

Dr. Nichols and Dr. Kolb report no disclosures. Dr. Cooper reports academic funding from LLS.

Patients undergoing chimeric antigen receptor (CAR) T-cell therapy who develop potentially serious neurotoxicity from the therapy show elevated plasma levels of neurofilament light chain (NfL) prior to the treatment, suggesting a possibly important predictor of risk for the side effect.

“This is the first study to show NfL levels are elevated even before CAR T treatment is given,” first author Omar H. Butt, MD, PhD, of the Siteman Cancer Center at Barnes-Jewish Hospital and Washington University in St. Louis, said in an interview.

“While unlikely to be the sole driver of [the neurotoxicity], neural injury reflected by NfL may aid in identifying a high-risk subset of patients undergoing cellular therapy,” the authors concluded in the study, published in JAMA Oncology.

CAR T-cell therapy has gained favor for virtually revolutionizing the treatment of some leukemias and lymphomas, however, as many as 40%-60% of patients develop the neurotoxicity side effect, called immune effector cell–associated neurotoxicity syndrome (ICANS), which, though usually low grade, in more severe cases can cause substantial morbidity and even mortality.

Hence, “the early identification of patients at risk for ICANS is critical for preemptive management,” the authors noted.

NfL, an established marker of neuroaxonal injury in neurodegenerative diseases including multiple sclerosis and Alzheimer’s disease, has been shown in previous studies to be elevated following the development of ICANS and up to 5 days prior to its peak symptoms.

To further evaluate NfL elevations in relation to ICANS, Dr. Butt and colleagues identified 30 patients undergoing CD19 CART-cell therapy, including 77% for diffuse large B-cell lymphoma, at two U.S. centers: Washington University in St. Louis and Case Western Reserve University, Cleveland.

The patients had a median age of 64 and were 40% female.

Among them, four developed low-grade ICANS grade 1-2, and 7 developed ICANS grade 3 or higher.

Of those developing any-grade ICANS, baseline elevations of NfL prior to the CAR T-cell treatment, were significantly higher, compared with those who did not develop ICANs (mean 87.6 pg/mL vs. 29.4 pg/mL, P < .001), with no significant differences between the low-grade (1 and 2) and higher-grade (3 or higher) ICANS groups.

A receiver operating characteristic analysis showed baseline NfL levels significantly predicted the development of ICANS with high accuracy (area under the ROC curve, 0.96), as well as sensitivity (AUROC, 0.91) and specificity (AUROC, 0.95).

Notably, baseline NfL levels were associated with ICANS severity, but did not correlate with other factors including demographic, oncologic history, nononcologic neurologic history, or history of exposure to neurotoxic therapies.

However, Dr. Butt added, “it is important to note that our study was insufficiently powered to examine those relationships in earnest. Therefore, [a correlation between NfL and those factors] remains possible,” he said.

The elevated NfL levels observed prior to the development of ICANS remained high across the study’s seven time points, up to day 30 post infusion.
 

Interest in NfL levels on the rise

NfL assessment is currently only clinically validated in amyotrophic lateral sclerosis, where it is used to assess neuroaxonal health and integrity. However, testing is available as interest and evidence of NfL’s potential role in other settings grows.

Meanwhile, Dr. Butt and associates are themselves developing an assay to predict the development of ICANS, which will likely include NfL, if the role is validated in further studies.

“Future studies will explore validating NfL for ICANS and additional indications,” he said.

ICANS symptoms can range from headaches and confusion to seizures or strokes in more severe cases.

The current gold standard for treatment includes early intervention with high-dose steroids and careful monitoring, but there is reluctance to use such therapies because of concerns about their blunting the anticancer effects of the CAR T cells.

Importantly, if validated, elevations in NfL could signal the need for more precautionary measures with CAR T-cell therapy, Dr. Butt noted.

“Our data suggests patients with high NfL levels at baseline would benefit most from perhaps closer monitoring with frequent checks and possible early intervention at the first sign of symptoms, a period of time when it may be hard to distinguish ICANS from other causes of confusion, such as delirium,” he explained.
 

Limitations: Validation, preventive measures needed

Commenting on the study, Sattva S. Neelapu, MD, a professor and deputy chair of the department of lymphoma and myeloma at the University of Texas MD Anderson Cancer Center, Houston, agreed that the findings have potentially important implications.

“I think this is a very intriguing and novel finding that needs to be investigated further prospectively in a larger cohort and across different CAR T products in patients with lymphoma, leukemia, and myeloma,” Dr. Neelapu said in an interview.

The NfL elevations observed even before CAR T-cell therapy among those who went on to develop ICANS are notable, he added.

“This is the surprising finding in the study,” Dr. Neelapu said. “It raises the question whether neurologic injury is caused by prior therapies that these patients received or whether it is an age-related phenomenon, as we do see higher incidence and severity of ICANS in older patients or some other mechanisms.”

A key caveat, however, is that even if a risk is identified, options to prevent ICANS are currently limited, Dr. Neelapu noted.

“I think it is too early to implement this into clinical practice,” he said. In addition to needing further validation, “assessing NfL levels would be useful when there is an effective prophylactic or therapeutic strategy – both of which also need to be investigated.”

Dr. Butt and colleagues are developing a clinical assay for ICANS and reported a provisional patent pending on the use of plasma NfL as a predictive biomarker for ICANS. The study received support from the Washington University in St. Louis, the Paula and Rodger O. Riney Fund, the Daniel J. Brennan MD Fund, the Fred Simmons and Olga Mohan Fund; the National Cancer Institute, the National Multiple Sclerosis Society, and the National Institute of Neurological Disorders and Stroke. Dr. Neelapu reported conflicts of interest with numerous pharmaceutical companies.

Patients undergoing chimeric antigen receptor (CAR) T-cell therapy who develop potentially serious neurotoxicity from the therapy show elevated plasma levels of neurofilament light chain (NfL) prior to the treatment, suggesting a possibly important predictor of risk for the side effect.

“This is the first study to show NfL levels are elevated even before CAR T treatment is given,” first author Omar H. Butt, MD, PhD, of the Siteman Cancer Center at Barnes-Jewish Hospital and Washington University in St. Louis, said in an interview.

“While unlikely to be the sole driver of [the neurotoxicity], neural injury reflected by NfL may aid in identifying a high-risk subset of patients undergoing cellular therapy,” the authors concluded in the study, published in JAMA Oncology.

CAR T-cell therapy has gained favor for virtually revolutionizing the treatment of some leukemias and lymphomas, however, as many as 40%-60% of patients develop the neurotoxicity side effect, called immune effector cell–associated neurotoxicity syndrome (ICANS), which, though usually low grade, in more severe cases can cause substantial morbidity and even mortality.

Hence, “the early identification of patients at risk for ICANS is critical for preemptive management,” the authors noted.

NfL, an established marker of neuroaxonal injury in neurodegenerative diseases including multiple sclerosis and Alzheimer’s disease, has been shown in previous studies to be elevated following the development of ICANS and up to 5 days prior to its peak symptoms.

To further evaluate NfL elevations in relation to ICANS, Dr. Butt and colleagues identified 30 patients undergoing CD19 CART-cell therapy, including 77% for diffuse large B-cell lymphoma, at two U.S. centers: Washington University in St. Louis and Case Western Reserve University, Cleveland.

The patients had a median age of 64 and were 40% female.

Among them, four developed low-grade ICANS grade 1-2, and 7 developed ICANS grade 3 or higher.

Of those developing any-grade ICANS, baseline elevations of NfL prior to the CAR T-cell treatment, were significantly higher, compared with those who did not develop ICANs (mean 87.6 pg/mL vs. 29.4 pg/mL, P < .001), with no significant differences between the low-grade (1 and 2) and higher-grade (3 or higher) ICANS groups.

A receiver operating characteristic analysis showed baseline NfL levels significantly predicted the development of ICANS with high accuracy (area under the ROC curve, 0.96), as well as sensitivity (AUROC, 0.91) and specificity (AUROC, 0.95).

Notably, baseline NfL levels were associated with ICANS severity, but did not correlate with other factors including demographic, oncologic history, nononcologic neurologic history, or history of exposure to neurotoxic therapies.

However, Dr. Butt added, “it is important to note that our study was insufficiently powered to examine those relationships in earnest. Therefore, [a correlation between NfL and those factors] remains possible,” he said.

The elevated NfL levels observed prior to the development of ICANS remained high across the study’s seven time points, up to day 30 post infusion.
 

Interest in NfL levels on the rise

NfL assessment is currently only clinically validated in amyotrophic lateral sclerosis, where it is used to assess neuroaxonal health and integrity. However, testing is available as interest and evidence of NfL’s potential role in other settings grows.

Meanwhile, Dr. Butt and associates are themselves developing an assay to predict the development of ICANS, which will likely include NfL, if the role is validated in further studies.

“Future studies will explore validating NfL for ICANS and additional indications,” he said.

ICANS symptoms can range from headaches and confusion to seizures or strokes in more severe cases.

The current gold standard for treatment includes early intervention with high-dose steroids and careful monitoring, but there is reluctance to use such therapies because of concerns about their blunting the anticancer effects of the CAR T cells.

Importantly, if validated, elevations in NfL could signal the need for more precautionary measures with CAR T-cell therapy, Dr. Butt noted.

“Our data suggests patients with high NfL levels at baseline would benefit most from perhaps closer monitoring with frequent checks and possible early intervention at the first sign of symptoms, a period of time when it may be hard to distinguish ICANS from other causes of confusion, such as delirium,” he explained.
 

Limitations: Validation, preventive measures needed

Commenting on the study, Sattva S. Neelapu, MD, a professor and deputy chair of the department of lymphoma and myeloma at the University of Texas MD Anderson Cancer Center, Houston, agreed that the findings have potentially important implications.

“I think this is a very intriguing and novel finding that needs to be investigated further prospectively in a larger cohort and across different CAR T products in patients with lymphoma, leukemia, and myeloma,” Dr. Neelapu said in an interview.

The NfL elevations observed even before CAR T-cell therapy among those who went on to develop ICANS are notable, he added.

“This is the surprising finding in the study,” Dr. Neelapu said. “It raises the question whether neurologic injury is caused by prior therapies that these patients received or whether it is an age-related phenomenon, as we do see higher incidence and severity of ICANS in older patients or some other mechanisms.”

A key caveat, however, is that even if a risk is identified, options to prevent ICANS are currently limited, Dr. Neelapu noted.

“I think it is too early to implement this into clinical practice,” he said. In addition to needing further validation, “assessing NfL levels would be useful when there is an effective prophylactic or therapeutic strategy – both of which also need to be investigated.”

Dr. Butt and colleagues are developing a clinical assay for ICANS and reported a provisional patent pending on the use of plasma NfL as a predictive biomarker for ICANS. The study received support from the Washington University in St. Louis, the Paula and Rodger O. Riney Fund, the Daniel J. Brennan MD Fund, the Fred Simmons and Olga Mohan Fund; the National Cancer Institute, the National Multiple Sclerosis Society, and the National Institute of Neurological Disorders and Stroke. Dr. Neelapu reported conflicts of interest with numerous pharmaceutical companies.

Patients undergoing chimeric antigen receptor (CAR) T-cell therapy who develop potentially serious neurotoxicity from the therapy show elevated plasma levels of neurofilament light chain (NfL) prior to the treatment, suggesting a possibly important predictor of risk for the side effect.

“This is the first study to show NfL levels are elevated even before CAR T treatment is given,” first author Omar H. Butt, MD, PhD, of the Siteman Cancer Center at Barnes-Jewish Hospital and Washington University in St. Louis, said in an interview.

“While unlikely to be the sole driver of [the neurotoxicity], neural injury reflected by NfL may aid in identifying a high-risk subset of patients undergoing cellular therapy,” the authors concluded in the study, published in JAMA Oncology.

CAR T-cell therapy has gained favor for virtually revolutionizing the treatment of some leukemias and lymphomas, however, as many as 40%-60% of patients develop the neurotoxicity side effect, called immune effector cell–associated neurotoxicity syndrome (ICANS), which, though usually low grade, in more severe cases can cause substantial morbidity and even mortality.

Hence, “the early identification of patients at risk for ICANS is critical for preemptive management,” the authors noted.

NfL, an established marker of neuroaxonal injury in neurodegenerative diseases including multiple sclerosis and Alzheimer’s disease, has been shown in previous studies to be elevated following the development of ICANS and up to 5 days prior to its peak symptoms.

To further evaluate NfL elevations in relation to ICANS, Dr. Butt and colleagues identified 30 patients undergoing CD19 CART-cell therapy, including 77% for diffuse large B-cell lymphoma, at two U.S. centers: Washington University in St. Louis and Case Western Reserve University, Cleveland.

The patients had a median age of 64 and were 40% female.

Among them, four developed low-grade ICANS grade 1-2, and 7 developed ICANS grade 3 or higher.

Of those developing any-grade ICANS, baseline elevations of NfL prior to the CAR T-cell treatment, were significantly higher, compared with those who did not develop ICANs (mean 87.6 pg/mL vs. 29.4 pg/mL, P < .001), with no significant differences between the low-grade (1 and 2) and higher-grade (3 or higher) ICANS groups.

A receiver operating characteristic analysis showed baseline NfL levels significantly predicted the development of ICANS with high accuracy (area under the ROC curve, 0.96), as well as sensitivity (AUROC, 0.91) and specificity (AUROC, 0.95).

Notably, baseline NfL levels were associated with ICANS severity, but did not correlate with other factors including demographic, oncologic history, nononcologic neurologic history, or history of exposure to neurotoxic therapies.

However, Dr. Butt added, “it is important to note that our study was insufficiently powered to examine those relationships in earnest. Therefore, [a correlation between NfL and those factors] remains possible,” he said.

The elevated NfL levels observed prior to the development of ICANS remained high across the study’s seven time points, up to day 30 post infusion.
 

Interest in NfL levels on the rise

NfL assessment is currently only clinically validated in amyotrophic lateral sclerosis, where it is used to assess neuroaxonal health and integrity. However, testing is available as interest and evidence of NfL’s potential role in other settings grows.

Meanwhile, Dr. Butt and associates are themselves developing an assay to predict the development of ICANS, which will likely include NfL, if the role is validated in further studies.

“Future studies will explore validating NfL for ICANS and additional indications,” he said.

ICANS symptoms can range from headaches and confusion to seizures or strokes in more severe cases.

The current gold standard for treatment includes early intervention with high-dose steroids and careful monitoring, but there is reluctance to use such therapies because of concerns about their blunting the anticancer effects of the CAR T cells.

Importantly, if validated, elevations in NfL could signal the need for more precautionary measures with CAR T-cell therapy, Dr. Butt noted.

“Our data suggests patients with high NfL levels at baseline would benefit most from perhaps closer monitoring with frequent checks and possible early intervention at the first sign of symptoms, a period of time when it may be hard to distinguish ICANS from other causes of confusion, such as delirium,” he explained.
 

Limitations: Validation, preventive measures needed

Commenting on the study, Sattva S. Neelapu, MD, a professor and deputy chair of the department of lymphoma and myeloma at the University of Texas MD Anderson Cancer Center, Houston, agreed that the findings have potentially important implications.

“I think this is a very intriguing and novel finding that needs to be investigated further prospectively in a larger cohort and across different CAR T products in patients with lymphoma, leukemia, and myeloma,” Dr. Neelapu said in an interview.

The NfL elevations observed even before CAR T-cell therapy among those who went on to develop ICANS are notable, he added.

“This is the surprising finding in the study,” Dr. Neelapu said. “It raises the question whether neurologic injury is caused by prior therapies that these patients received or whether it is an age-related phenomenon, as we do see higher incidence and severity of ICANS in older patients or some other mechanisms.”

A key caveat, however, is that even if a risk is identified, options to prevent ICANS are currently limited, Dr. Neelapu noted.

“I think it is too early to implement this into clinical practice,” he said. In addition to needing further validation, “assessing NfL levels would be useful when there is an effective prophylactic or therapeutic strategy – both of which also need to be investigated.”

Dr. Butt and colleagues are developing a clinical assay for ICANS and reported a provisional patent pending on the use of plasma NfL as a predictive biomarker for ICANS. The study received support from the Washington University in St. Louis, the Paula and Rodger O. Riney Fund, the Daniel J. Brennan MD Fund, the Fred Simmons and Olga Mohan Fund; the National Cancer Institute, the National Multiple Sclerosis Society, and the National Institute of Neurological Disorders and Stroke. Dr. Neelapu reported conflicts of interest with numerous pharmaceutical companies.

Ibrutinib (Imbruvica) is now available for use in children aged 1-12 years who have chronic graft-versus-host disease (cGVHD), which can develop after stem cell transplantation for treatment of a blood cancer.

Specifically, the indication is for pediatric patients with cGVHD who have already been treated with one or more lines of systemic therapy. The manufacturers have also launched a new oral suspension formulation, in addition to capsules and tablets, which were already available.

Ibrutinib is already approved for use in adults with cGVHD.

The drug is also approved for use in several blood cancers, including chronic lymphocytic leukemia, mantle cell lymphoma, and Waldenström’s macroglobulinemia. All these approvals are for adult patients.

This is the first pediatric indication for the product and is “incredibly meaningful,” said Gauri Sunkersett, DO, associate medical director at AbbVie, which markets the drug together with Jansen. “As a pediatric oncologist, when my patients describe the physical pain they experience from simply hugging their parents, due to their cGVHD, the importance of researching alternative treatment options in this patient population is further validated.”

These children have already been through a lot, having been diagnosed with a leukemia or lymphoma and then undergoing chemotherapy and/or radiotherapy for a stem cell transplant. Just over half (52%-65%) of children who receive allogeneic transplants go on to develop cGVHD, in which the donor bone marrow or stem cells attack the recipient.

“Imagine going through a transplant and then being told you have a moderate to severe chronic disease that can sometimes also be life-threatening,” commented Paul A. Carpenter, MD, attending physician at Seattle Children’s Hospital. “If these children were between 1 and 12 and didn’t respond to steroid treatment, we didn’t have any rigorously studied treatment options – until now.”

The new indication was approved by the U.S. Food and Drug Administration on the basis of results from the iMAGINE trial, for which Dr. Carpenter was a principal investigator.

The phase 1/2 iMAGINE trial was an open-label, multicenter, single-arm trial conducted with 47 patients (mean age, 13 years; range, 1-19 years) with relapsed/refractory cGVHD who had received at least one prior systemic therapy. Ibrutinib was given at a dose of 420 mg orally once daily to patients aged 12 and older and at a dose of 240 mg/m2 orally once daily to patients who were younger than 12 years.

The overall response rate through week 25 was 60% (confidence interval, 95%, 44%-74%). The median duration of response was 5.3 months (95% CI, 2.8-8.8).

The safety profile was consistent with the established profile for ibrutinib. Observed adverse events in pediatric patients were consistent with those observed in adult patients with moderate to severe cGVHD, the companies noted.

The FDA noted that the most common (≥ 20%) adverse reactions, including laboratory abnormalities, were anemia, musculoskeletal pain, pyrexia, diarrhea, pneumonia, abdominal pain, stomatitis, thrombocytopenia, and headache.

Full prescribing information for ibrutinib is available here.

A version of this article first appeared on Medscape.com.

Ibrutinib (Imbruvica) is now available for use in children aged 1-12 years who have chronic graft-versus-host disease (cGVHD), which can develop after stem cell transplantation for treatment of a blood cancer.

Specifically, the indication is for pediatric patients with cGVHD who have already been treated with one or more lines of systemic therapy. The manufacturers have also launched a new oral suspension formulation, in addition to capsules and tablets, which were already available.

Ibrutinib is already approved for use in adults with cGVHD.

The drug is also approved for use in several blood cancers, including chronic lymphocytic leukemia, mantle cell lymphoma, and Waldenström’s macroglobulinemia. All these approvals are for adult patients.

This is the first pediatric indication for the product and is “incredibly meaningful,” said Gauri Sunkersett, DO, associate medical director at AbbVie, which markets the drug together with Jansen. “As a pediatric oncologist, when my patients describe the physical pain they experience from simply hugging their parents, due to their cGVHD, the importance of researching alternative treatment options in this patient population is further validated.”

These children have already been through a lot, having been diagnosed with a leukemia or lymphoma and then undergoing chemotherapy and/or radiotherapy for a stem cell transplant. Just over half (52%-65%) of children who receive allogeneic transplants go on to develop cGVHD, in which the donor bone marrow or stem cells attack the recipient.

“Imagine going through a transplant and then being told you have a moderate to severe chronic disease that can sometimes also be life-threatening,” commented Paul A. Carpenter, MD, attending physician at Seattle Children’s Hospital. “If these children were between 1 and 12 and didn’t respond to steroid treatment, we didn’t have any rigorously studied treatment options – until now.”

The new indication was approved by the U.S. Food and Drug Administration on the basis of results from the iMAGINE trial, for which Dr. Carpenter was a principal investigator.

The phase 1/2 iMAGINE trial was an open-label, multicenter, single-arm trial conducted with 47 patients (mean age, 13 years; range, 1-19 years) with relapsed/refractory cGVHD who had received at least one prior systemic therapy. Ibrutinib was given at a dose of 420 mg orally once daily to patients aged 12 and older and at a dose of 240 mg/m2 orally once daily to patients who were younger than 12 years.

The overall response rate through week 25 was 60% (confidence interval, 95%, 44%-74%). The median duration of response was 5.3 months (95% CI, 2.8-8.8).

The safety profile was consistent with the established profile for ibrutinib. Observed adverse events in pediatric patients were consistent with those observed in adult patients with moderate to severe cGVHD, the companies noted.

The FDA noted that the most common (≥ 20%) adverse reactions, including laboratory abnormalities, were anemia, musculoskeletal pain, pyrexia, diarrhea, pneumonia, abdominal pain, stomatitis, thrombocytopenia, and headache.

Full prescribing information for ibrutinib is available here.

A version of this article first appeared on Medscape.com.

Ibrutinib (Imbruvica) is now available for use in children aged 1-12 years who have chronic graft-versus-host disease (cGVHD), which can develop after stem cell transplantation for treatment of a blood cancer.

Specifically, the indication is for pediatric patients with cGVHD who have already been treated with one or more lines of systemic therapy. The manufacturers have also launched a new oral suspension formulation, in addition to capsules and tablets, which were already available.

Ibrutinib is already approved for use in adults with cGVHD.

The drug is also approved for use in several blood cancers, including chronic lymphocytic leukemia, mantle cell lymphoma, and Waldenström’s macroglobulinemia. All these approvals are for adult patients.

This is the first pediatric indication for the product and is “incredibly meaningful,” said Gauri Sunkersett, DO, associate medical director at AbbVie, which markets the drug together with Jansen. “As a pediatric oncologist, when my patients describe the physical pain they experience from simply hugging their parents, due to their cGVHD, the importance of researching alternative treatment options in this patient population is further validated.”

These children have already been through a lot, having been diagnosed with a leukemia or lymphoma and then undergoing chemotherapy and/or radiotherapy for a stem cell transplant. Just over half (52%-65%) of children who receive allogeneic transplants go on to develop cGVHD, in which the donor bone marrow or stem cells attack the recipient.

“Imagine going through a transplant and then being told you have a moderate to severe chronic disease that can sometimes also be life-threatening,” commented Paul A. Carpenter, MD, attending physician at Seattle Children’s Hospital. “If these children were between 1 and 12 and didn’t respond to steroid treatment, we didn’t have any rigorously studied treatment options – until now.”

The new indication was approved by the U.S. Food and Drug Administration on the basis of results from the iMAGINE trial, for which Dr. Carpenter was a principal investigator.

The phase 1/2 iMAGINE trial was an open-label, multicenter, single-arm trial conducted with 47 patients (mean age, 13 years; range, 1-19 years) with relapsed/refractory cGVHD who had received at least one prior systemic therapy. Ibrutinib was given at a dose of 420 mg orally once daily to patients aged 12 and older and at a dose of 240 mg/m2 orally once daily to patients who were younger than 12 years.

The overall response rate through week 25 was 60% (confidence interval, 95%, 44%-74%). The median duration of response was 5.3 months (95% CI, 2.8-8.8).

The safety profile was consistent with the established profile for ibrutinib. Observed adverse events in pediatric patients were consistent with those observed in adult patients with moderate to severe cGVHD, the companies noted.

The FDA noted that the most common (≥ 20%) adverse reactions, including laboratory abnormalities, were anemia, musculoskeletal pain, pyrexia, diarrhea, pneumonia, abdominal pain, stomatitis, thrombocytopenia, and headache.

Full prescribing information for ibrutinib is available here.

A version of this article first appeared on Medscape.com.