Leukemia, Myelodysplasia, Transplantation

Image by Difu Wu

The antibiotic tigecycline may enhance the treatment of chronic myeloid leukemia (CML), according to research published in Nature Medicine. ‌

Using cells isolated from CML patients, researchers showed that treatment with tigecycline, an antibiotic used to treat bacterial infection, is effective in killing CML stem cells when used in combination with the tyrosine kinase inhibitor (TKI) imatinib.

The study also suggested the combination can stave off relapse in animal models of CML.

“We were very excited to find that, when we treated CML cells with both the antibiotic tigecycline and the TKI drug imatinib, CML stem cells were selectively killed,” said study author Vignir Helgason, PhD, of the University of Glasgow in Scotland.

“We believe that our findings provide a strong basis for testing this novel therapeutic strategy in clinical trials in order to eliminate CML stem cells and provide cure for CML patients.”

The researchers said they found that, in primitive CML stem and progenitor cells, mitochondrial oxidative metabolism is crucial for the production of energy and anabolic precursors. This suggested that restraining mitochondrial functions might have a therapeutic benefit in CML.

The team knew that, in addition to inhibiting bacterial protein synthesis, tigecycline inhibits the synthesis of mitochondrion-encoded proteins, which are required for the oxidative phosphorylation machinery.

So the researchers tested tigecycline, alone or in combination with imatinib, in CML cells. Both treatments (tigecycline monotherapy and the combination) “strongly impaired” the proliferation of primary CD34+ CML cells.

However, imatinib alone had “a moderate effect.” The researchers said this is in line with the preferential effect of imatinib on differentiated CD34− cells.

Each drug alone decreased the number of short-term CML colony-forming cells (CFCs), and the combination eliminated colony formation entirely. This correlated with an increase in cell death.

Neither monotherapy nor the combination had a significant effect on non-leukemic CFCs.

The researchers then turned to a xenotransplantation model of human CML. Starting 6 weeks after transplant, mice received daily doses of vehicle, tigecycline (escalating doses of 25–100 mg per kg body weight), imatinib (100 mg per kg body weight), or both drugs. All treatment was given for 4 weeks.

The team said there were no signs of toxicity in any of the mice.

Compared to controls, tigecycline-treated mice had a marginal decrease in the total number of CML-derived CD45+ cells in the bone marrow, and imatinib-treated mice had a significant decrease in these cells. But the CML burden decreased even further with combination treatment.

The researchers noted that imatinib alone marginally decreased the number of CD45+CD34+CD38− CML cells, but combination treatment eliminated 95% of these cells.

Finally, the team tested each drug alone and in combination (as well as vehicle control) in additional cohorts of mice with CML. After receiving treatment for 4 weeks, mice were left untreated for either 2 weeks or 3 weeks.

Mice that received imatinib alone showed signs of relapse at 2 and 3 weeks, as they had similar numbers of leukemic cells as vehicle-treated mice. However, most of the mice treated with the combination had low numbers of leukemic stem cells in the bone marrow.

“Our work in this study demonstrates, for the first time, that CML stem cells are metabolically distinct from normal blood stem cells, and this, in turn, provides opportunities to selectively target them,” said study author Eyal Gottlieb, PhD, of the Cancer Research UK Beatson Institute in Glasgow.

“It’s exciting to see that using an antibiotic alongside an existing treatment could be a way to keep this type of leukemia at bay and potentially even cure it,” added Karen Vousden, PhD, Cancer Research UK’s chief scientist.

“If this approach is shown to be safe and effective in humans too, it could offer a new option for patients who, at the moment, face long-term treatment with the possibility of relapse.”

This research was funded by AstraZeneca, Cancer Research UK, The Medical Research Council, Scottish Government Chief Scientist Office, The Howat Foundation, Friends of the Paul O’Gorman Leukaemia Research Centre, Bloodwise, The Kay Kendall Leukaemia Fund, Lady Tata International Award, and Leuka.

Image by Difu Wu

The antibiotic tigecycline may enhance the treatment of chronic myeloid leukemia (CML), according to research published in Nature Medicine. ‌

Using cells isolated from CML patients, researchers showed that treatment with tigecycline, an antibiotic used to treat bacterial infection, is effective in killing CML stem cells when used in combination with the tyrosine kinase inhibitor (TKI) imatinib.

The study also suggested the combination can stave off relapse in animal models of CML.

“We were very excited to find that, when we treated CML cells with both the antibiotic tigecycline and the TKI drug imatinib, CML stem cells were selectively killed,” said study author Vignir Helgason, PhD, of the University of Glasgow in Scotland.

“We believe that our findings provide a strong basis for testing this novel therapeutic strategy in clinical trials in order to eliminate CML stem cells and provide cure for CML patients.”

The researchers said they found that, in primitive CML stem and progenitor cells, mitochondrial oxidative metabolism is crucial for the production of energy and anabolic precursors. This suggested that restraining mitochondrial functions might have a therapeutic benefit in CML.

The team knew that, in addition to inhibiting bacterial protein synthesis, tigecycline inhibits the synthesis of mitochondrion-encoded proteins, which are required for the oxidative phosphorylation machinery.

So the researchers tested tigecycline, alone or in combination with imatinib, in CML cells. Both treatments (tigecycline monotherapy and the combination) “strongly impaired” the proliferation of primary CD34+ CML cells.

However, imatinib alone had “a moderate effect.” The researchers said this is in line with the preferential effect of imatinib on differentiated CD34− cells.

Each drug alone decreased the number of short-term CML colony-forming cells (CFCs), and the combination eliminated colony formation entirely. This correlated with an increase in cell death.

Neither monotherapy nor the combination had a significant effect on non-leukemic CFCs.

The researchers then turned to a xenotransplantation model of human CML. Starting 6 weeks after transplant, mice received daily doses of vehicle, tigecycline (escalating doses of 25–100 mg per kg body weight), imatinib (100 mg per kg body weight), or both drugs. All treatment was given for 4 weeks.

The team said there were no signs of toxicity in any of the mice.

Compared to controls, tigecycline-treated mice had a marginal decrease in the total number of CML-derived CD45+ cells in the bone marrow, and imatinib-treated mice had a significant decrease in these cells. But the CML burden decreased even further with combination treatment.

The researchers noted that imatinib alone marginally decreased the number of CD45+CD34+CD38− CML cells, but combination treatment eliminated 95% of these cells.

Finally, the team tested each drug alone and in combination (as well as vehicle control) in additional cohorts of mice with CML. After receiving treatment for 4 weeks, mice were left untreated for either 2 weeks or 3 weeks.

Mice that received imatinib alone showed signs of relapse at 2 and 3 weeks, as they had similar numbers of leukemic cells as vehicle-treated mice. However, most of the mice treated with the combination had low numbers of leukemic stem cells in the bone marrow.

“Our work in this study demonstrates, for the first time, that CML stem cells are metabolically distinct from normal blood stem cells, and this, in turn, provides opportunities to selectively target them,” said study author Eyal Gottlieb, PhD, of the Cancer Research UK Beatson Institute in Glasgow.

“It’s exciting to see that using an antibiotic alongside an existing treatment could be a way to keep this type of leukemia at bay and potentially even cure it,” added Karen Vousden, PhD, Cancer Research UK’s chief scientist.

“If this approach is shown to be safe and effective in humans too, it could offer a new option for patients who, at the moment, face long-term treatment with the possibility of relapse.”

This research was funded by AstraZeneca, Cancer Research UK, The Medical Research Council, Scottish Government Chief Scientist Office, The Howat Foundation, Friends of the Paul O’Gorman Leukaemia Research Centre, Bloodwise, The Kay Kendall Leukaemia Fund, Lady Tata International Award, and Leuka.

Image by Difu Wu

The antibiotic tigecycline may enhance the treatment of chronic myeloid leukemia (CML), according to research published in Nature Medicine. ‌

Using cells isolated from CML patients, researchers showed that treatment with tigecycline, an antibiotic used to treat bacterial infection, is effective in killing CML stem cells when used in combination with the tyrosine kinase inhibitor (TKI) imatinib.

The study also suggested the combination can stave off relapse in animal models of CML.

“We were very excited to find that, when we treated CML cells with both the antibiotic tigecycline and the TKI drug imatinib, CML stem cells were selectively killed,” said study author Vignir Helgason, PhD, of the University of Glasgow in Scotland.

“We believe that our findings provide a strong basis for testing this novel therapeutic strategy in clinical trials in order to eliminate CML stem cells and provide cure for CML patients.”

The researchers said they found that, in primitive CML stem and progenitor cells, mitochondrial oxidative metabolism is crucial for the production of energy and anabolic precursors. This suggested that restraining mitochondrial functions might have a therapeutic benefit in CML.

The team knew that, in addition to inhibiting bacterial protein synthesis, tigecycline inhibits the synthesis of mitochondrion-encoded proteins, which are required for the oxidative phosphorylation machinery.

So the researchers tested tigecycline, alone or in combination with imatinib, in CML cells. Both treatments (tigecycline monotherapy and the combination) “strongly impaired” the proliferation of primary CD34+ CML cells.

However, imatinib alone had “a moderate effect.” The researchers said this is in line with the preferential effect of imatinib on differentiated CD34− cells.

Each drug alone decreased the number of short-term CML colony-forming cells (CFCs), and the combination eliminated colony formation entirely. This correlated with an increase in cell death.

Neither monotherapy nor the combination had a significant effect on non-leukemic CFCs.

The researchers then turned to a xenotransplantation model of human CML. Starting 6 weeks after transplant, mice received daily doses of vehicle, tigecycline (escalating doses of 25–100 mg per kg body weight), imatinib (100 mg per kg body weight), or both drugs. All treatment was given for 4 weeks.

The team said there were no signs of toxicity in any of the mice.

Compared to controls, tigecycline-treated mice had a marginal decrease in the total number of CML-derived CD45+ cells in the bone marrow, and imatinib-treated mice had a significant decrease in these cells. But the CML burden decreased even further with combination treatment.

The researchers noted that imatinib alone marginally decreased the number of CD45+CD34+CD38− CML cells, but combination treatment eliminated 95% of these cells.

Finally, the team tested each drug alone and in combination (as well as vehicle control) in additional cohorts of mice with CML. After receiving treatment for 4 weeks, mice were left untreated for either 2 weeks or 3 weeks.

Mice that received imatinib alone showed signs of relapse at 2 and 3 weeks, as they had similar numbers of leukemic cells as vehicle-treated mice. However, most of the mice treated with the combination had low numbers of leukemic stem cells in the bone marrow.

“Our work in this study demonstrates, for the first time, that CML stem cells are metabolically distinct from normal blood stem cells, and this, in turn, provides opportunities to selectively target them,” said study author Eyal Gottlieb, PhD, of the Cancer Research UK Beatson Institute in Glasgow.

“It’s exciting to see that using an antibiotic alongside an existing treatment could be a way to keep this type of leukemia at bay and potentially even cure it,” added Karen Vousden, PhD, Cancer Research UK’s chief scientist.

“If this approach is shown to be safe and effective in humans too, it could offer a new option for patients who, at the moment, face long-term treatment with the possibility of relapse.”

This research was funded by AstraZeneca, Cancer Research UK, The Medical Research Council, Scottish Government Chief Scientist Office, The Howat Foundation, Friends of the Paul O’Gorman Leukaemia Research Centre, Bloodwise, The Kay Kendall Leukaemia Fund, Lady Tata International Award, and Leuka.

MADRID – Flotetuzumab, a novel bispecific monoclonal antibody that employs a proprietary technology to redirect T lymphocytes to kill CD123-expressing cells, was safe and demonstrated efficacy in patients with acute myeloid leukemia in a phase 1 trial, based on data presented at the European Society for Medical Oncology (ESMO) Congress.

Flotetuzumab combines a portion of antibody recognizing CD3, which is an activating molecule expressed by T cells, and an arm that recognizes CD123 on the cancer cell, explained Norbert Vey, MD, PhD, Head, Leukemia Treatment Unit, Institut Paoli-Calmettes, Marseille, France. This bispecific quality, produced through a proprietary technology called Dual-Affinity ReTargeting, is considered promising because CD123 is expressed by more than 90% of AML cells and is highly expressed on stem cells involved in initiating myelodysplastic syndrome (MDS).

In this dose-ranging study (NCT02152956), 42 patients with AML and 5 patients with MDS were treated in the first cycle with infusions of flotetuzumab on either a continuous 7-day or a 4-days-on, 3-days-off schedule. For subsequent cycles, patients received the 4-days-on, 3-days-off schedule. Continuous infusion is employed due to the short half-life of flotetuzumab.

The most common adverse events were infusion-related reactions, which were observed in 76.6% of patients. Pyrexia, a potential sign of cytokine release syndrome (CRS), was observed in 23.4% of patients, who were given tocilizumab at the earliest sign of CRS. Two patients had grade 3 CRS, and one discontinued therapy. There was also one case of grade 3 myalgia. Dr. Vey characterized the overall level of adverse events as “acceptable.”

In addition to its relative safety, flotetuzumab was associated with “encouraging antileukemic activity,” Dr. Vey said. Six of 14 patients receiving doses that exceeded 500 ng/kg per day had objective responses and two of these patients had complete responses. Again, toxicity at these dose levels was considered manageable.

“This rate of clinical response is exciting,” commented Tim Somervaille, MD, Senior Group Leader, Leukemia Biology Laboratory, Cancer Research UK Institute, Manchester (England). An ESMO-invited discussant on this paper, Dr. Somervaille expressed enthusiasm in general about a growing role for bispecific T-cell engagers. Blinatumomab, the first of these agents, received regulatory approval for refractory AML in 2014.

“There are a number of these bispecific T cell antibodies that are in early-phase trials,” said Dr. Somervaille, citing several that also target CD123 within the context of a different partner antigen than that employed by flotetuzumab. He also mentioned ongoing efforts to develop bispecific natural killer cell engagers that target malignant cells through immune activation.

As for flotetuzumab, the phase 1 trial provided adequate data to encourage further development.

“A cohort expansion is now ongoing and enrolling patients at 11 sites in the United States and Europe,” Dr. Vey reported. “A clinical update on these results is expected by the end of the year.”

Dr. Vey reported financial relationships with Bristol-Myers Squibb, Novartis, and Servier.

MacroGenics retains full development and commercialization rights to flotetuzumab in the United States, Canada, Mexico, Japan, South Korea, and India. Servier participates in the development and has rights to flotetuzumab in all other countries. The U.S. Food and Drug Administration has granted orphan drug designation to flotetuzumab for the investigational treatment of AML, according to a press release from MacroGenics.

MADRID – Flotetuzumab, a novel bispecific monoclonal antibody that employs a proprietary technology to redirect T lymphocytes to kill CD123-expressing cells, was safe and demonstrated efficacy in patients with acute myeloid leukemia in a phase 1 trial, based on data presented at the European Society for Medical Oncology (ESMO) Congress.

Flotetuzumab combines a portion of antibody recognizing CD3, which is an activating molecule expressed by T cells, and an arm that recognizes CD123 on the cancer cell, explained Norbert Vey, MD, PhD, Head, Leukemia Treatment Unit, Institut Paoli-Calmettes, Marseille, France. This bispecific quality, produced through a proprietary technology called Dual-Affinity ReTargeting, is considered promising because CD123 is expressed by more than 90% of AML cells and is highly expressed on stem cells involved in initiating myelodysplastic syndrome (MDS).

In this dose-ranging study (NCT02152956), 42 patients with AML and 5 patients with MDS were treated in the first cycle with infusions of flotetuzumab on either a continuous 7-day or a 4-days-on, 3-days-off schedule. For subsequent cycles, patients received the 4-days-on, 3-days-off schedule. Continuous infusion is employed due to the short half-life of flotetuzumab.

The most common adverse events were infusion-related reactions, which were observed in 76.6% of patients. Pyrexia, a potential sign of cytokine release syndrome (CRS), was observed in 23.4% of patients, who were given tocilizumab at the earliest sign of CRS. Two patients had grade 3 CRS, and one discontinued therapy. There was also one case of grade 3 myalgia. Dr. Vey characterized the overall level of adverse events as “acceptable.”

In addition to its relative safety, flotetuzumab was associated with “encouraging antileukemic activity,” Dr. Vey said. Six of 14 patients receiving doses that exceeded 500 ng/kg per day had objective responses and two of these patients had complete responses. Again, toxicity at these dose levels was considered manageable.

“This rate of clinical response is exciting,” commented Tim Somervaille, MD, Senior Group Leader, Leukemia Biology Laboratory, Cancer Research UK Institute, Manchester (England). An ESMO-invited discussant on this paper, Dr. Somervaille expressed enthusiasm in general about a growing role for bispecific T-cell engagers. Blinatumomab, the first of these agents, received regulatory approval for refractory AML in 2014.

“There are a number of these bispecific T cell antibodies that are in early-phase trials,” said Dr. Somervaille, citing several that also target CD123 within the context of a different partner antigen than that employed by flotetuzumab. He also mentioned ongoing efforts to develop bispecific natural killer cell engagers that target malignant cells through immune activation.

As for flotetuzumab, the phase 1 trial provided adequate data to encourage further development.

“A cohort expansion is now ongoing and enrolling patients at 11 sites in the United States and Europe,” Dr. Vey reported. “A clinical update on these results is expected by the end of the year.”

Dr. Vey reported financial relationships with Bristol-Myers Squibb, Novartis, and Servier.

MacroGenics retains full development and commercialization rights to flotetuzumab in the United States, Canada, Mexico, Japan, South Korea, and India. Servier participates in the development and has rights to flotetuzumab in all other countries. The U.S. Food and Drug Administration has granted orphan drug designation to flotetuzumab for the investigational treatment of AML, according to a press release from MacroGenics.

MADRID – Flotetuzumab, a novel bispecific monoclonal antibody that employs a proprietary technology to redirect T lymphocytes to kill CD123-expressing cells, was safe and demonstrated efficacy in patients with acute myeloid leukemia in a phase 1 trial, based on data presented at the European Society for Medical Oncology (ESMO) Congress.

Flotetuzumab combines a portion of antibody recognizing CD3, which is an activating molecule expressed by T cells, and an arm that recognizes CD123 on the cancer cell, explained Norbert Vey, MD, PhD, Head, Leukemia Treatment Unit, Institut Paoli-Calmettes, Marseille, France. This bispecific quality, produced through a proprietary technology called Dual-Affinity ReTargeting, is considered promising because CD123 is expressed by more than 90% of AML cells and is highly expressed on stem cells involved in initiating myelodysplastic syndrome (MDS).

In this dose-ranging study (NCT02152956), 42 patients with AML and 5 patients with MDS were treated in the first cycle with infusions of flotetuzumab on either a continuous 7-day or a 4-days-on, 3-days-off schedule. For subsequent cycles, patients received the 4-days-on, 3-days-off schedule. Continuous infusion is employed due to the short half-life of flotetuzumab.

The most common adverse events were infusion-related reactions, which were observed in 76.6% of patients. Pyrexia, a potential sign of cytokine release syndrome (CRS), was observed in 23.4% of patients, who were given tocilizumab at the earliest sign of CRS. Two patients had grade 3 CRS, and one discontinued therapy. There was also one case of grade 3 myalgia. Dr. Vey characterized the overall level of adverse events as “acceptable.”

In addition to its relative safety, flotetuzumab was associated with “encouraging antileukemic activity,” Dr. Vey said. Six of 14 patients receiving doses that exceeded 500 ng/kg per day had objective responses and two of these patients had complete responses. Again, toxicity at these dose levels was considered manageable.

“This rate of clinical response is exciting,” commented Tim Somervaille, MD, Senior Group Leader, Leukemia Biology Laboratory, Cancer Research UK Institute, Manchester (England). An ESMO-invited discussant on this paper, Dr. Somervaille expressed enthusiasm in general about a growing role for bispecific T-cell engagers. Blinatumomab, the first of these agents, received regulatory approval for refractory AML in 2014.

“There are a number of these bispecific T cell antibodies that are in early-phase trials,” said Dr. Somervaille, citing several that also target CD123 within the context of a different partner antigen than that employed by flotetuzumab. He also mentioned ongoing efforts to develop bispecific natural killer cell engagers that target malignant cells through immune activation.

As for flotetuzumab, the phase 1 trial provided adequate data to encourage further development.

“A cohort expansion is now ongoing and enrolling patients at 11 sites in the United States and Europe,” Dr. Vey reported. “A clinical update on these results is expected by the end of the year.”

Dr. Vey reported financial relationships with Bristol-Myers Squibb, Novartis, and Servier.

MacroGenics retains full development and commercialization rights to flotetuzumab in the United States, Canada, Mexico, Japan, South Korea, and India. Servier participates in the development and has rights to flotetuzumab in all other countries. The U.S. Food and Drug Administration has granted orphan drug designation to flotetuzumab for the investigational treatment of AML, according to a press release from MacroGenics.

Photo courtesy of Novartis

The European Commission has approved the multi-targeted kinase inhibitor midostaurin (Rydapt®) to treat acute myeloid leukemia (AML) and 3 types of advanced systemic mastocytosis (SM).

Midostaurin is approved to treat adults with newly diagnosed acute myeloid leukemia (AML) who are FLT3 mutation-positive. In these patients, midostaurin can be used in combination with standard daunorubicin and cytarabine induction, followed by high-dose cytarabine consolidation. Patients who achieve a complete response can then receive midostaurin as maintenance therapy.

Midostaurin is also approved as monotherapy for adults with aggressive SM (ASM), SM with associated hematological neoplasm (SM-AHN), and mast cell leukemia (MCL).

Midostaurin in AML

The approval of midostaurin in AML is based on results from the phase 3 RATIFY trial, which were published in NEJM last month.

In RATIFY, researchers compared midostaurin plus standard chemotherapy to placebo plus standard chemotherapy in 717 adults younger than age 60 who had FLT3-mutated AML.

The median overall survival was significantly longer in the midostaurin arm than the placebo arm—74.7 months and 25.6 months, respectively (hazard ratio=0.77, P=0.016).

And the median event-free survival was significantly longer in the midostaurin arm than the placebo arm—8.2 months and 3.0 months, respectively (hazard ratio=0.78, P=0.004).

The most frequent adverse events (AEs) in the midostaurin arm (occurring in at least 20% of patients) were febrile neutropenia, nausea, vomiting, mucositis, headache, musculoskeletal pain, petechiae, device-related infection, epistaxis, hyperglycemia, and upper respiratory tract infection.

The most frequent grade 3/4 AEs (occurring in at least 10% of patients) were febrile neutropenia, device-related infection, and mucositis. Nine percent of patients in the midostaurin arm stopped treatment due to AEs, as did 6% in the placebo arm.

Midostaurin in advanced SM

The approval of midostaurin in advanced SM is based on results from a pair of phase 2, single-arm studies, hereafter referred to as Study 2 and Study 3. Data from Study 2 were published in NEJM in June 2016, and data from Study 3 were presented at the 2010 ASH Annual Meeting.

Study 2 included 116 patients, 115 of whom were evaluable for response.

The overall response rate (ORR) was 17% in the entire cohort, 31% among patients with ASM, 11% among patients with SM-AHN, and 19% among patients with MCL. The complete response rates were 2%, 6%, 0%, and 5%, respectively.

Study 3 included 26 patients with advanced SM. In 3 of the patients, the subtype of SM was unconfirmed.

Among the 17 patients with SM-AHN, there were 10 responses (ORR=59%), including 1 partial response and 9 major responses. In the 6 patients with MCL, there were 2 responses (ORR=33%), which included 1 partial response and 1 major response.

In both studies combined, there were 142 adults with ASM, SM-AHN, or MCL.

The most frequent AEs (excluding laboratory abnormalities) that occurred in at least 20% of these patients were nausea, vomiting, diarrhea, edema, musculoskeletal pain, abdominal pain, fatigue, upper respiratory tract infection, constipation, pyrexia, headache, and dyspnea.

The most frequent grade 3 or higher AEs (excluding laboratory abnormalities) that occurred in at least 5% of patients were fatigue, sepsis, gastrointestinal hemorrhage, pneumonia, diarrhea, febrile neutropenia, edema, dyspnea, nausea, vomiting, abdominal pain, and renal insufficiency.

Serious AEs occurred in 68% of patients, most commonly infections and gastrointestinal disorders.

Twenty-one percent of patients discontinued treatment due to AEs, the most frequent of which were infection, nausea or vomiting, QT prolongation, and gastrointestinal hemorrhage.

Photo courtesy of Novartis

The European Commission has approved the multi-targeted kinase inhibitor midostaurin (Rydapt®) to treat acute myeloid leukemia (AML) and 3 types of advanced systemic mastocytosis (SM).

Midostaurin is approved to treat adults with newly diagnosed acute myeloid leukemia (AML) who are FLT3 mutation-positive. In these patients, midostaurin can be used in combination with standard daunorubicin and cytarabine induction, followed by high-dose cytarabine consolidation. Patients who achieve a complete response can then receive midostaurin as maintenance therapy.

Midostaurin is also approved as monotherapy for adults with aggressive SM (ASM), SM with associated hematological neoplasm (SM-AHN), and mast cell leukemia (MCL).

Midostaurin in AML

The approval of midostaurin in AML is based on results from the phase 3 RATIFY trial, which were published in NEJM last month.

In RATIFY, researchers compared midostaurin plus standard chemotherapy to placebo plus standard chemotherapy in 717 adults younger than age 60 who had FLT3-mutated AML.

The median overall survival was significantly longer in the midostaurin arm than the placebo arm—74.7 months and 25.6 months, respectively (hazard ratio=0.77, P=0.016).

And the median event-free survival was significantly longer in the midostaurin arm than the placebo arm—8.2 months and 3.0 months, respectively (hazard ratio=0.78, P=0.004).

The most frequent adverse events (AEs) in the midostaurin arm (occurring in at least 20% of patients) were febrile neutropenia, nausea, vomiting, mucositis, headache, musculoskeletal pain, petechiae, device-related infection, epistaxis, hyperglycemia, and upper respiratory tract infection.

The most frequent grade 3/4 AEs (occurring in at least 10% of patients) were febrile neutropenia, device-related infection, and mucositis. Nine percent of patients in the midostaurin arm stopped treatment due to AEs, as did 6% in the placebo arm.

Midostaurin in advanced SM

The approval of midostaurin in advanced SM is based on results from a pair of phase 2, single-arm studies, hereafter referred to as Study 2 and Study 3. Data from Study 2 were published in NEJM in June 2016, and data from Study 3 were presented at the 2010 ASH Annual Meeting.

Study 2 included 116 patients, 115 of whom were evaluable for response.

The overall response rate (ORR) was 17% in the entire cohort, 31% among patients with ASM, 11% among patients with SM-AHN, and 19% among patients with MCL. The complete response rates were 2%, 6%, 0%, and 5%, respectively.

Study 3 included 26 patients with advanced SM. In 3 of the patients, the subtype of SM was unconfirmed.

Among the 17 patients with SM-AHN, there were 10 responses (ORR=59%), including 1 partial response and 9 major responses. In the 6 patients with MCL, there were 2 responses (ORR=33%), which included 1 partial response and 1 major response.

In both studies combined, there were 142 adults with ASM, SM-AHN, or MCL.

The most frequent AEs (excluding laboratory abnormalities) that occurred in at least 20% of these patients were nausea, vomiting, diarrhea, edema, musculoskeletal pain, abdominal pain, fatigue, upper respiratory tract infection, constipation, pyrexia, headache, and dyspnea.

The most frequent grade 3 or higher AEs (excluding laboratory abnormalities) that occurred in at least 5% of patients were fatigue, sepsis, gastrointestinal hemorrhage, pneumonia, diarrhea, febrile neutropenia, edema, dyspnea, nausea, vomiting, abdominal pain, and renal insufficiency.

Serious AEs occurred in 68% of patients, most commonly infections and gastrointestinal disorders.

Twenty-one percent of patients discontinued treatment due to AEs, the most frequent of which were infection, nausea or vomiting, QT prolongation, and gastrointestinal hemorrhage.

Photo courtesy of Novartis

The European Commission has approved the multi-targeted kinase inhibitor midostaurin (Rydapt®) to treat acute myeloid leukemia (AML) and 3 types of advanced systemic mastocytosis (SM).

Midostaurin is approved to treat adults with newly diagnosed acute myeloid leukemia (AML) who are FLT3 mutation-positive. In these patients, midostaurin can be used in combination with standard daunorubicin and cytarabine induction, followed by high-dose cytarabine consolidation. Patients who achieve a complete response can then receive midostaurin as maintenance therapy.

Midostaurin is also approved as monotherapy for adults with aggressive SM (ASM), SM with associated hematological neoplasm (SM-AHN), and mast cell leukemia (MCL).

Midostaurin in AML

The approval of midostaurin in AML is based on results from the phase 3 RATIFY trial, which were published in NEJM last month.

In RATIFY, researchers compared midostaurin plus standard chemotherapy to placebo plus standard chemotherapy in 717 adults younger than age 60 who had FLT3-mutated AML.

The median overall survival was significantly longer in the midostaurin arm than the placebo arm—74.7 months and 25.6 months, respectively (hazard ratio=0.77, P=0.016).

And the median event-free survival was significantly longer in the midostaurin arm than the placebo arm—8.2 months and 3.0 months, respectively (hazard ratio=0.78, P=0.004).

The most frequent adverse events (AEs) in the midostaurin arm (occurring in at least 20% of patients) were febrile neutropenia, nausea, vomiting, mucositis, headache, musculoskeletal pain, petechiae, device-related infection, epistaxis, hyperglycemia, and upper respiratory tract infection.

The most frequent grade 3/4 AEs (occurring in at least 10% of patients) were febrile neutropenia, device-related infection, and mucositis. Nine percent of patients in the midostaurin arm stopped treatment due to AEs, as did 6% in the placebo arm.

Midostaurin in advanced SM

The approval of midostaurin in advanced SM is based on results from a pair of phase 2, single-arm studies, hereafter referred to as Study 2 and Study 3. Data from Study 2 were published in NEJM in June 2016, and data from Study 3 were presented at the 2010 ASH Annual Meeting.

Study 2 included 116 patients, 115 of whom were evaluable for response.

The overall response rate (ORR) was 17% in the entire cohort, 31% among patients with ASM, 11% among patients with SM-AHN, and 19% among patients with MCL. The complete response rates were 2%, 6%, 0%, and 5%, respectively.

Study 3 included 26 patients with advanced SM. In 3 of the patients, the subtype of SM was unconfirmed.

Among the 17 patients with SM-AHN, there were 10 responses (ORR=59%), including 1 partial response and 9 major responses. In the 6 patients with MCL, there were 2 responses (ORR=33%), which included 1 partial response and 1 major response.

In both studies combined, there were 142 adults with ASM, SM-AHN, or MCL.

The most frequent AEs (excluding laboratory abnormalities) that occurred in at least 20% of these patients were nausea, vomiting, diarrhea, edema, musculoskeletal pain, abdominal pain, fatigue, upper respiratory tract infection, constipation, pyrexia, headache, and dyspnea.

The most frequent grade 3 or higher AEs (excluding laboratory abnormalities) that occurred in at least 5% of patients were fatigue, sepsis, gastrointestinal hemorrhage, pneumonia, diarrhea, febrile neutropenia, edema, dyspnea, nausea, vomiting, abdominal pain, and renal insufficiency.

Serious AEs occurred in 68% of patients, most commonly infections and gastrointestinal disorders.

Twenty-one percent of patients discontinued treatment due to AEs, the most frequent of which were infection, nausea or vomiting, QT prolongation, and gastrointestinal hemorrhage.

Image from NIAID

The US Food and Drug Administration (FDA) has granted Regenerative Medicine Advanced Therapy (RMAT) designation to ATIR101™, which is intended to be used as an adjunct to haploidentical hematopoietic stem cell transplant (HSCT).

ATIR101 is a personalized T-cell immunotherapy—a donor lymphocyte preparation selectively depleted of host-alloreactive T cells through the use of photo-dynamic therapy.

Recipient-reactive T cells from the donor are activated in a unidirectional mixed-lymphocyte reaction. The cells are then treated with TH9402 (a rhodamide-like dye), which is selectively retained in activated T cells.

Subsequent light exposure eliminates the activated recipient-reactive T cells but preserves the other T cells.

The final product is infused after CD34-selected haploidentical HSCT with the goal of preventing infectious complications, graft-versus-host disease (GVHD), and relapse.

About RMAT designation

The RMAT pathway is analogous to the breakthrough therapy designation designed for traditional drug candidates and medical devices. RMAT designation was specifically created by the US Congress in 2016 in the hopes of getting new cell therapies and advanced medicinal products to patients earlier.

Just like breakthrough designation, RMAT designation allows companies developing regenerative medicine therapies to interact with the FDA more frequently in the clinical testing process. In addition, RMAT-designated products may be eligible for priority review and accelerated approval.

A regenerative medicine is eligible for RMAT designation if it is intended to treat, modify, reverse, or cure a serious or life-threatening disease or condition, and if preliminary clinical evidence indicates the treatment has the potential to address unmet medical needs for such a disease or condition.

“To receive the RMAT designation from the FDA is an important milestone for Kiadis Pharma and a recognition by the FDA of the significant potential for ATIR101 to help patients receive safer and more effective bone marrow transplantations,” said Arthur Lahr, CEO of Kiadis Pharma, the company developing ATIR101.

“We are now going to work even closer with the FDA to agree a path to make this cell therapy treatment available for patients in the US as soon as possible. In Europe, ATIR101 was filed for registration in April 2017, and we continue to prepare the company for the potential European launch in 2019.”

ATIR101 trials

Results of a phase 2 trial of ATIR101 were presented at the 42nd Annual Meeting of the European Society of Blood and Marrow Transplantation in 2016.

Patients who received ATIR101 after haploidentical HSCT had significant improvements in transplant-related mortality and overall survival when compared to historical controls who received a T-cell-depleted haploidentical HSCT without ATIR101.

None of the patients who received ATIR101 developed grade 3-4 GVHD, but a few patients did develop grade 2 GVHD.

A phase 3 trial of ATIR101 is now underway. The trial is expected to enroll 200 patients with acute myeloid leukemia, acute lymphoblastic leukemia, or myelodysplastic syndrome.

The patients will receive a haploidentical HSCT with either a T-cell-depleted graft and adjunctive treatment with ATIR101 or a T-cell-replete graft and post-transplant cyclophosphamide.

Image from NIAID

The US Food and Drug Administration (FDA) has granted Regenerative Medicine Advanced Therapy (RMAT) designation to ATIR101™, which is intended to be used as an adjunct to haploidentical hematopoietic stem cell transplant (HSCT).

ATIR101 is a personalized T-cell immunotherapy—a donor lymphocyte preparation selectively depleted of host-alloreactive T cells through the use of photo-dynamic therapy.

Recipient-reactive T cells from the donor are activated in a unidirectional mixed-lymphocyte reaction. The cells are then treated with TH9402 (a rhodamide-like dye), which is selectively retained in activated T cells.

Subsequent light exposure eliminates the activated recipient-reactive T cells but preserves the other T cells.

The final product is infused after CD34-selected haploidentical HSCT with the goal of preventing infectious complications, graft-versus-host disease (GVHD), and relapse.

About RMAT designation

The RMAT pathway is analogous to the breakthrough therapy designation designed for traditional drug candidates and medical devices. RMAT designation was specifically created by the US Congress in 2016 in the hopes of getting new cell therapies and advanced medicinal products to patients earlier.

Just like breakthrough designation, RMAT designation allows companies developing regenerative medicine therapies to interact with the FDA more frequently in the clinical testing process. In addition, RMAT-designated products may be eligible for priority review and accelerated approval.

A regenerative medicine is eligible for RMAT designation if it is intended to treat, modify, reverse, or cure a serious or life-threatening disease or condition, and if preliminary clinical evidence indicates the treatment has the potential to address unmet medical needs for such a disease or condition.

“To receive the RMAT designation from the FDA is an important milestone for Kiadis Pharma and a recognition by the FDA of the significant potential for ATIR101 to help patients receive safer and more effective bone marrow transplantations,” said Arthur Lahr, CEO of Kiadis Pharma, the company developing ATIR101.

“We are now going to work even closer with the FDA to agree a path to make this cell therapy treatment available for patients in the US as soon as possible. In Europe, ATIR101 was filed for registration in April 2017, and we continue to prepare the company for the potential European launch in 2019.”

ATIR101 trials

Results of a phase 2 trial of ATIR101 were presented at the 42nd Annual Meeting of the European Society of Blood and Marrow Transplantation in 2016.

Patients who received ATIR101 after haploidentical HSCT had significant improvements in transplant-related mortality and overall survival when compared to historical controls who received a T-cell-depleted haploidentical HSCT without ATIR101.

None of the patients who received ATIR101 developed grade 3-4 GVHD, but a few patients did develop grade 2 GVHD.

A phase 3 trial of ATIR101 is now underway. The trial is expected to enroll 200 patients with acute myeloid leukemia, acute lymphoblastic leukemia, or myelodysplastic syndrome.

The patients will receive a haploidentical HSCT with either a T-cell-depleted graft and adjunctive treatment with ATIR101 or a T-cell-replete graft and post-transplant cyclophosphamide.

Image from NIAID

The US Food and Drug Administration (FDA) has granted Regenerative Medicine Advanced Therapy (RMAT) designation to ATIR101™, which is intended to be used as an adjunct to haploidentical hematopoietic stem cell transplant (HSCT).

ATIR101 is a personalized T-cell immunotherapy—a donor lymphocyte preparation selectively depleted of host-alloreactive T cells through the use of photo-dynamic therapy.

Recipient-reactive T cells from the donor are activated in a unidirectional mixed-lymphocyte reaction. The cells are then treated with TH9402 (a rhodamide-like dye), which is selectively retained in activated T cells.

Subsequent light exposure eliminates the activated recipient-reactive T cells but preserves the other T cells.

The final product is infused after CD34-selected haploidentical HSCT with the goal of preventing infectious complications, graft-versus-host disease (GVHD), and relapse.

About RMAT designation

The RMAT pathway is analogous to the breakthrough therapy designation designed for traditional drug candidates and medical devices. RMAT designation was specifically created by the US Congress in 2016 in the hopes of getting new cell therapies and advanced medicinal products to patients earlier.

Just like breakthrough designation, RMAT designation allows companies developing regenerative medicine therapies to interact with the FDA more frequently in the clinical testing process. In addition, RMAT-designated products may be eligible for priority review and accelerated approval.

A regenerative medicine is eligible for RMAT designation if it is intended to treat, modify, reverse, or cure a serious or life-threatening disease or condition, and if preliminary clinical evidence indicates the treatment has the potential to address unmet medical needs for such a disease or condition.

“To receive the RMAT designation from the FDA is an important milestone for Kiadis Pharma and a recognition by the FDA of the significant potential for ATIR101 to help patients receive safer and more effective bone marrow transplantations,” said Arthur Lahr, CEO of Kiadis Pharma, the company developing ATIR101.

“We are now going to work even closer with the FDA to agree a path to make this cell therapy treatment available for patients in the US as soon as possible. In Europe, ATIR101 was filed for registration in April 2017, and we continue to prepare the company for the potential European launch in 2019.”

ATIR101 trials

Results of a phase 2 trial of ATIR101 were presented at the 42nd Annual Meeting of the European Society of Blood and Marrow Transplantation in 2016.

Patients who received ATIR101 after haploidentical HSCT had significant improvements in transplant-related mortality and overall survival when compared to historical controls who received a T-cell-depleted haploidentical HSCT without ATIR101.

None of the patients who received ATIR101 developed grade 3-4 GVHD, but a few patients did develop grade 2 GVHD.

A phase 3 trial of ATIR101 is now underway. The trial is expected to enroll 200 patients with acute myeloid leukemia, acute lymphoblastic leukemia, or myelodysplastic syndrome.

The patients will receive a haploidentical HSCT with either a T-cell-depleted graft and adjunctive treatment with ATIR101 or a T-cell-replete graft and post-transplant cyclophosphamide.

Anderson Cancer Center

Researchers say they have created guidelines for managing the unique toxicities associated with chimeric antigen receptor (CAR) T-cell therapy.

The guidelines focus on cytokine release syndrome (CRS); neurological toxicity, which the researchers have dubbed “CAR-T-cell-related encephalopathy syndrome (CRES);” and adverse effects related to these syndromes.

“The toxicities are unique, and every member of the care team needs to be trained to recognize them and act accordingly,” said Sattva Neelapu, MD, of University of Texas MD Anderson Cancer Center in Houston.

Dr Neelapu and his colleagues described the toxicities and related recommendations in Nature Reviews Clinical Oncology.

The team’s guidelines include supportive-care considerations for patients receiving CAR T‑cell therapy. For example, they recommend:

• Baseline brain MRI to rule out central nervous system disease
• Cardiac monitoring starting on the day of CAR T‑cell infusion
• Assessing a patient’s vital signs every 4 hours after CAR T-cell infusion
• Assessing and grading CRS at least twice daily and whenever the patient’s status changes
• Assessing and grading CRES at least every 8 hours.

CRS

One section of the guidelines is dedicated to CRS, with subsections on pathophysiology, precautions and supportive care, the use of corticosteroids and IL‑6/IL‑6R antagonists, and grading CRS.

The researchers noted that CRS typically manifests with constitutional symptoms, such as fever, malaise, anorexia, and myalgias. However, CRS can affect any organ system in the body.

The team recommends managing CRS according to grade. For example, patients with grade 1 CRS should typically receive supportive care. However, physicians should consider giving tocilizumab or siltuximab to grade 1 patients who have a refractory fever lasting more than 3 days.

The researchers also noted that CRS can evolve into fulminant hemophagocytic lymphohistiocytosis (HLH), also known as macrophage-activation syndrome (MAS).

The team said HLH/MAS encompasses a group of severe immunological disorders characterized by hyperactivation of macrophages and lymphocytes, proinflammatory cytokine production, lymphohistiocytic tissue infiltration, and immune-mediated multi-organ failure.

The guidelines include diagnostic criteria for CAR T‑cell-related HLH/MAS and recommendations for managing the condition.

CRES

One section of the guidelines is dedicated to the grading and treatment of CRES, which typically mani­fests as a toxic encephalopathy.

The researchers said the earliest signs of CRES are diminished attention, language disturbance, and impaired handwriting. Other symptoms include confusion, disorientation, agitation, apha­sia, somnolence, and tremors.

Patients with severe CRES (grade >2) may experience seizures, motor weakness, incontinence, mental obtundation, increased intracra­nial pressure, papilledema, and cerebral edema.

Therefore, the guidelines include recommendations for the management of status epilepticus and raised intracranial pressure after CAR T‑cell therapy.

The researchers also devised an algorithm, known as CARTOX-10, for identifying neurotoxicity. (An existing general method didn’t effectively quantify the neurological effects caused by CAR T-cell therapies.)

CARTOX-10 is a 10-point test in which patients are asked to do the following:

• Name the current month (1 point) and year (1 point)
• Name the city (1 point) and hospital they are in (1 point)
• Name the president/prime minister of their home country (1 point)
• Name 3 nearby objects (3 points)
• Write a standard sentence (1 point)
• Count backward from 100 by tens (1 point).

A perfect score indicates normal cognitive function. A patient has mild to severe impairment depending on the number of questions or activities missed.

Dr Neelapu and his colleagues believe their recommendations will be applicable to other types of cell-based immunotherapy as well, including CAR natural killer cells, T-cell receptor engineered T cells, and combination drugs that use an antibody to connect T cells to targets on cancer cells.

Researchers involved in this work have received funding from companies developing/marketing CAR T-cell therapies.

Anderson Cancer Center

Researchers say they have created guidelines for managing the unique toxicities associated with chimeric antigen receptor (CAR) T-cell therapy.

The guidelines focus on cytokine release syndrome (CRS); neurological toxicity, which the researchers have dubbed “CAR-T-cell-related encephalopathy syndrome (CRES);” and adverse effects related to these syndromes.

“The toxicities are unique, and every member of the care team needs to be trained to recognize them and act accordingly,” said Sattva Neelapu, MD, of University of Texas MD Anderson Cancer Center in Houston.

Dr Neelapu and his colleagues described the toxicities and related recommendations in Nature Reviews Clinical Oncology.

The team’s guidelines include supportive-care considerations for patients receiving CAR T‑cell therapy. For example, they recommend:

• Baseline brain MRI to rule out central nervous system disease
• Cardiac monitoring starting on the day of CAR T‑cell infusion
• Assessing a patient’s vital signs every 4 hours after CAR T-cell infusion
• Assessing and grading CRS at least twice daily and whenever the patient’s status changes
• Assessing and grading CRES at least every 8 hours.

CRS

One section of the guidelines is dedicated to CRS, with subsections on pathophysiology, precautions and supportive care, the use of corticosteroids and IL‑6/IL‑6R antagonists, and grading CRS.

The researchers noted that CRS typically manifests with constitutional symptoms, such as fever, malaise, anorexia, and myalgias. However, CRS can affect any organ system in the body.

The team recommends managing CRS according to grade. For example, patients with grade 1 CRS should typically receive supportive care. However, physicians should consider giving tocilizumab or siltuximab to grade 1 patients who have a refractory fever lasting more than 3 days.

The researchers also noted that CRS can evolve into fulminant hemophagocytic lymphohistiocytosis (HLH), also known as macrophage-activation syndrome (MAS).

The team said HLH/MAS encompasses a group of severe immunological disorders characterized by hyperactivation of macrophages and lymphocytes, proinflammatory cytokine production, lymphohistiocytic tissue infiltration, and immune-mediated multi-organ failure.

The guidelines include diagnostic criteria for CAR T‑cell-related HLH/MAS and recommendations for managing the condition.

CRES

One section of the guidelines is dedicated to the grading and treatment of CRES, which typically mani­fests as a toxic encephalopathy.

The researchers said the earliest signs of CRES are diminished attention, language disturbance, and impaired handwriting. Other symptoms include confusion, disorientation, agitation, apha­sia, somnolence, and tremors.

Patients with severe CRES (grade >2) may experience seizures, motor weakness, incontinence, mental obtundation, increased intracra­nial pressure, papilledema, and cerebral edema.

Therefore, the guidelines include recommendations for the management of status epilepticus and raised intracranial pressure after CAR T‑cell therapy.

The researchers also devised an algorithm, known as CARTOX-10, for identifying neurotoxicity. (An existing general method didn’t effectively quantify the neurological effects caused by CAR T-cell therapies.)

CARTOX-10 is a 10-point test in which patients are asked to do the following:

• Name the current month (1 point) and year (1 point)
• Name the city (1 point) and hospital they are in (1 point)
• Name the president/prime minister of their home country (1 point)
• Name 3 nearby objects (3 points)
• Write a standard sentence (1 point)
• Count backward from 100 by tens (1 point).

A perfect score indicates normal cognitive function. A patient has mild to severe impairment depending on the number of questions or activities missed.

Dr Neelapu and his colleagues believe their recommendations will be applicable to other types of cell-based immunotherapy as well, including CAR natural killer cells, T-cell receptor engineered T cells, and combination drugs that use an antibody to connect T cells to targets on cancer cells.

Researchers involved in this work have received funding from companies developing/marketing CAR T-cell therapies.

Anderson Cancer Center

Researchers say they have created guidelines for managing the unique toxicities associated with chimeric antigen receptor (CAR) T-cell therapy.

The guidelines focus on cytokine release syndrome (CRS); neurological toxicity, which the researchers have dubbed “CAR-T-cell-related encephalopathy syndrome (CRES);” and adverse effects related to these syndromes.

“The toxicities are unique, and every member of the care team needs to be trained to recognize them and act accordingly,” said Sattva Neelapu, MD, of University of Texas MD Anderson Cancer Center in Houston.

Dr Neelapu and his colleagues described the toxicities and related recommendations in Nature Reviews Clinical Oncology.

The team’s guidelines include supportive-care considerations for patients receiving CAR T‑cell therapy. For example, they recommend:

• Baseline brain MRI to rule out central nervous system disease
• Cardiac monitoring starting on the day of CAR T‑cell infusion
• Assessing a patient’s vital signs every 4 hours after CAR T-cell infusion
• Assessing and grading CRS at least twice daily and whenever the patient’s status changes
• Assessing and grading CRES at least every 8 hours.

CRS

One section of the guidelines is dedicated to CRS, with subsections on pathophysiology, precautions and supportive care, the use of corticosteroids and IL‑6/IL‑6R antagonists, and grading CRS.

The researchers noted that CRS typically manifests with constitutional symptoms, such as fever, malaise, anorexia, and myalgias. However, CRS can affect any organ system in the body.

The team recommends managing CRS according to grade. For example, patients with grade 1 CRS should typically receive supportive care. However, physicians should consider giving tocilizumab or siltuximab to grade 1 patients who have a refractory fever lasting more than 3 days.

The researchers also noted that CRS can evolve into fulminant hemophagocytic lymphohistiocytosis (HLH), also known as macrophage-activation syndrome (MAS).

The team said HLH/MAS encompasses a group of severe immunological disorders characterized by hyperactivation of macrophages and lymphocytes, proinflammatory cytokine production, lymphohistiocytic tissue infiltration, and immune-mediated multi-organ failure.

The guidelines include diagnostic criteria for CAR T‑cell-related HLH/MAS and recommendations for managing the condition.

CRES

One section of the guidelines is dedicated to the grading and treatment of CRES, which typically mani­fests as a toxic encephalopathy.

The researchers said the earliest signs of CRES are diminished attention, language disturbance, and impaired handwriting. Other symptoms include confusion, disorientation, agitation, apha­sia, somnolence, and tremors.

Patients with severe CRES (grade >2) may experience seizures, motor weakness, incontinence, mental obtundation, increased intracra­nial pressure, papilledema, and cerebral edema.

Therefore, the guidelines include recommendations for the management of status epilepticus and raised intracranial pressure after CAR T‑cell therapy.

The researchers also devised an algorithm, known as CARTOX-10, for identifying neurotoxicity. (An existing general method didn’t effectively quantify the neurological effects caused by CAR T-cell therapies.)

CARTOX-10 is a 10-point test in which patients are asked to do the following:

• Name the current month (1 point) and year (1 point)
• Name the city (1 point) and hospital they are in (1 point)
• Name the president/prime minister of their home country (1 point)
• Name 3 nearby objects (3 points)
• Write a standard sentence (1 point)
• Count backward from 100 by tens (1 point).

A perfect score indicates normal cognitive function. A patient has mild to severe impairment depending on the number of questions or activities missed.

Dr Neelapu and his colleagues believe their recommendations will be applicable to other types of cell-based immunotherapy as well, including CAR natural killer cells, T-cell receptor engineered T cells, and combination drugs that use an antibody to connect T cells to targets on cancer cells.

Researchers involved in this work have received funding from companies developing/marketing CAR T-cell therapies.

Micrograph showing MDS

MADRID—Interim results of a phase 1 study suggest flotetuzumab, a CD123 and CD3 bispecific antibody, may be a feasible treatment option for relapsed or refractory acute myeloid leukemia (AML) or intermediate/high-risk myelodysplastic syndromes (MDS).

Researchers said flotetuzumab demonstrated acceptable tolerability in the dose-escalation portion of the study, with infusion-related reactions (IRRs) and cytokine release syndrome (CRS) being the most common adverse events (AEs).

In addition, flotetuzumab exhibited anti-leukemic activity in 8 of 14 response-evaluable patients, with 6 patients achieving a response.

Norbert Vey, MD, of Institut Paoli-Calmettes in Marseille, France, presented these results at the ESMO 2017 Congress (abstract 995O*). The study is sponsored by MacroGenics, Inc., the company developing flotetuzumab.

Flotetuzumab (MGD006) recognizes CD123 and CD3. The primary mechanism of flotetuzumab is thought to be its ability to redirect T cells to kill CD123-expressing cells. To achieve this, the molecule combines a portion of an antibody recognizing CD3 (an activating molecule expressed by T cells) with an arm that recognizes CD123 on the target cancer cells.

In this ongoing phase 1 study of flotetuzumab, researchers have enrolled 47 patients with a median age of 64 (range, 29-84). About 89% of these patients had AML (n=42), and the rest (n=5) had MDS.

Twenty-four percent had relapsed AML (n=10), 55% had refractory AML (n=23), and 21% had failed treatment with hypomethylating agents (n=9). One patient had intermediate-1-risk MDS, 2 had intermediate-2-risk, and 2 had high-risk MDS.

Treatment

The study began with single patients receiving flotetuzumab at escalating doses—3 ng/kg/day, 10 ng/kg/day, 30 ng/kg/day, and 100 ng/kg/day.

Then, patients received a range of doses on 2 different schedules for cycle 1. One group received treatment 7 days a week. The other had a 4-days-on/3-days-off schedule.

All patients received a lead-in dose during the first week of cycle 1. They received 30 ng/kg/day for 3 days, then 100 ng/kg/day for 4 days.

For the rest of cycle 1, patients in the 4 days/3 days group received doses of 500 ng/kg, 700 ng/kg, 900 ng/kg, or 1000 ng/kg. Patients in the daily dosing group received doses of 300 ng/kg, 500 ng/kg, 700 ng/kg, 900 ng/kg, or 1000 ng/kg.

For cycle 2 and beyond, all patients were on the 4-days-on/3-days-off schedule.

Safety

The maximum tolerated dose and schedule was 500 ng/kg/day for 7 days.

Dose-limiting toxicities occurring at the 700 ng/kg/day dose included grade 2 IRRs/CRS in 2 patients and grade 3 myalgia in 1 patient. There was 1 drug-related central nervous system AE that led to treatment discontinuation.

IRRs/CRS occurred in 77% of patients, with 13% of patients having grade 3 events and 8.5% of patients discontinuing treatment due to IRRs/CRS.

The researchers said they found ways to decrease the incidence and severity of CRS. One is early intervention with tocilizumab. The other is a 2-step lead-in dose during week 1. So patients first receive 30 ng/kg, then 100 ng/kg, and then their target dose.

Other grade 3 AEs occurring in this trial include febrile neutropenia (11%), anemia (11%), and decreases in platelets (13%), white blood cells (11%), and lymphocytes (13%).

Efficacy

The researchers said they observed encouraging anti-leukemic activity in patients treated at 500 ng/kg/day or greater.

As of the data cut-off, 14 patients treated at this dose were evaluable for response. Eight (57%) patients had anti-leukemic activity, with 6 (43%) of these patients experiencing an objective response.

One patient achieved a complete response (CR), 2 had a CR with incomplete count recovery, and 1 had a molecular CR.

In most responders, anti-leukemic activity was observed after a single cycle of therapy.

MacroGenics is currently enrolling patients in dose-expansion cohorts. The company plans to present updated results from this trial at another scientific conference later this year.

*Slides from this presentation are available on the MacroGenics website at http://ir.macrogenics.com/events.cfm.

Micrograph showing MDS

MADRID—Interim results of a phase 1 study suggest flotetuzumab, a CD123 and CD3 bispecific antibody, may be a feasible treatment option for relapsed or refractory acute myeloid leukemia (AML) or intermediate/high-risk myelodysplastic syndromes (MDS).

Researchers said flotetuzumab demonstrated acceptable tolerability in the dose-escalation portion of the study, with infusion-related reactions (IRRs) and cytokine release syndrome (CRS) being the most common adverse events (AEs).

In addition, flotetuzumab exhibited anti-leukemic activity in 8 of 14 response-evaluable patients, with 6 patients achieving a response.

Norbert Vey, MD, of Institut Paoli-Calmettes in Marseille, France, presented these results at the ESMO 2017 Congress (abstract 995O*). The study is sponsored by MacroGenics, Inc., the company developing flotetuzumab.

Flotetuzumab (MGD006) recognizes CD123 and CD3. The primary mechanism of flotetuzumab is thought to be its ability to redirect T cells to kill CD123-expressing cells. To achieve this, the molecule combines a portion of an antibody recognizing CD3 (an activating molecule expressed by T cells) with an arm that recognizes CD123 on the target cancer cells.

In this ongoing phase 1 study of flotetuzumab, researchers have enrolled 47 patients with a median age of 64 (range, 29-84). About 89% of these patients had AML (n=42), and the rest (n=5) had MDS.

Twenty-four percent had relapsed AML (n=10), 55% had refractory AML (n=23), and 21% had failed treatment with hypomethylating agents (n=9). One patient had intermediate-1-risk MDS, 2 had intermediate-2-risk, and 2 had high-risk MDS.

Treatment

The study began with single patients receiving flotetuzumab at escalating doses—3 ng/kg/day, 10 ng/kg/day, 30 ng/kg/day, and 100 ng/kg/day.

Then, patients received a range of doses on 2 different schedules for cycle 1. One group received treatment 7 days a week. The other had a 4-days-on/3-days-off schedule.

All patients received a lead-in dose during the first week of cycle 1. They received 30 ng/kg/day for 3 days, then 100 ng/kg/day for 4 days.

For the rest of cycle 1, patients in the 4 days/3 days group received doses of 500 ng/kg, 700 ng/kg, 900 ng/kg, or 1000 ng/kg. Patients in the daily dosing group received doses of 300 ng/kg, 500 ng/kg, 700 ng/kg, 900 ng/kg, or 1000 ng/kg.

For cycle 2 and beyond, all patients were on the 4-days-on/3-days-off schedule.

Safety

The maximum tolerated dose and schedule was 500 ng/kg/day for 7 days.

Dose-limiting toxicities occurring at the 700 ng/kg/day dose included grade 2 IRRs/CRS in 2 patients and grade 3 myalgia in 1 patient. There was 1 drug-related central nervous system AE that led to treatment discontinuation.

IRRs/CRS occurred in 77% of patients, with 13% of patients having grade 3 events and 8.5% of patients discontinuing treatment due to IRRs/CRS.

The researchers said they found ways to decrease the incidence and severity of CRS. One is early intervention with tocilizumab. The other is a 2-step lead-in dose during week 1. So patients first receive 30 ng/kg, then 100 ng/kg, and then their target dose.

Other grade 3 AEs occurring in this trial include febrile neutropenia (11%), anemia (11%), and decreases in platelets (13%), white blood cells (11%), and lymphocytes (13%).

Efficacy

The researchers said they observed encouraging anti-leukemic activity in patients treated at 500 ng/kg/day or greater.

As of the data cut-off, 14 patients treated at this dose were evaluable for response. Eight (57%) patients had anti-leukemic activity, with 6 (43%) of these patients experiencing an objective response.

One patient achieved a complete response (CR), 2 had a CR with incomplete count recovery, and 1 had a molecular CR.

In most responders, anti-leukemic activity was observed after a single cycle of therapy.

MacroGenics is currently enrolling patients in dose-expansion cohorts. The company plans to present updated results from this trial at another scientific conference later this year.

*Slides from this presentation are available on the MacroGenics website at http://ir.macrogenics.com/events.cfm.

Micrograph showing MDS

MADRID—Interim results of a phase 1 study suggest flotetuzumab, a CD123 and CD3 bispecific antibody, may be a feasible treatment option for relapsed or refractory acute myeloid leukemia (AML) or intermediate/high-risk myelodysplastic syndromes (MDS).

Researchers said flotetuzumab demonstrated acceptable tolerability in the dose-escalation portion of the study, with infusion-related reactions (IRRs) and cytokine release syndrome (CRS) being the most common adverse events (AEs).

In addition, flotetuzumab exhibited anti-leukemic activity in 8 of 14 response-evaluable patients, with 6 patients achieving a response.

Norbert Vey, MD, of Institut Paoli-Calmettes in Marseille, France, presented these results at the ESMO 2017 Congress (abstract 995O*). The study is sponsored by MacroGenics, Inc., the company developing flotetuzumab.

Flotetuzumab (MGD006) recognizes CD123 and CD3. The primary mechanism of flotetuzumab is thought to be its ability to redirect T cells to kill CD123-expressing cells. To achieve this, the molecule combines a portion of an antibody recognizing CD3 (an activating molecule expressed by T cells) with an arm that recognizes CD123 on the target cancer cells.

In this ongoing phase 1 study of flotetuzumab, researchers have enrolled 47 patients with a median age of 64 (range, 29-84). About 89% of these patients had AML (n=42), and the rest (n=5) had MDS.

Twenty-four percent had relapsed AML (n=10), 55% had refractory AML (n=23), and 21% had failed treatment with hypomethylating agents (n=9). One patient had intermediate-1-risk MDS, 2 had intermediate-2-risk, and 2 had high-risk MDS.

Treatment

The study began with single patients receiving flotetuzumab at escalating doses—3 ng/kg/day, 10 ng/kg/day, 30 ng/kg/day, and 100 ng/kg/day.

Then, patients received a range of doses on 2 different schedules for cycle 1. One group received treatment 7 days a week. The other had a 4-days-on/3-days-off schedule.

All patients received a lead-in dose during the first week of cycle 1. They received 30 ng/kg/day for 3 days, then 100 ng/kg/day for 4 days.

For the rest of cycle 1, patients in the 4 days/3 days group received doses of 500 ng/kg, 700 ng/kg, 900 ng/kg, or 1000 ng/kg. Patients in the daily dosing group received doses of 300 ng/kg, 500 ng/kg, 700 ng/kg, 900 ng/kg, or 1000 ng/kg.

For cycle 2 and beyond, all patients were on the 4-days-on/3-days-off schedule.

Safety

The maximum tolerated dose and schedule was 500 ng/kg/day for 7 days.

Dose-limiting toxicities occurring at the 700 ng/kg/day dose included grade 2 IRRs/CRS in 2 patients and grade 3 myalgia in 1 patient. There was 1 drug-related central nervous system AE that led to treatment discontinuation.

IRRs/CRS occurred in 77% of patients, with 13% of patients having grade 3 events and 8.5% of patients discontinuing treatment due to IRRs/CRS.

The researchers said they found ways to decrease the incidence and severity of CRS. One is early intervention with tocilizumab. The other is a 2-step lead-in dose during week 1. So patients first receive 30 ng/kg, then 100 ng/kg, and then their target dose.

Other grade 3 AEs occurring in this trial include febrile neutropenia (11%), anemia (11%), and decreases in platelets (13%), white blood cells (11%), and lymphocytes (13%).

Efficacy

The researchers said they observed encouraging anti-leukemic activity in patients treated at 500 ng/kg/day or greater.

As of the data cut-off, 14 patients treated at this dose were evaluable for response. Eight (57%) patients had anti-leukemic activity, with 6 (43%) of these patients experiencing an objective response.

One patient achieved a complete response (CR), 2 had a CR with incomplete count recovery, and 1 had a molecular CR.

In most responders, anti-leukemic activity was observed after a single cycle of therapy.

MacroGenics is currently enrolling patients in dose-expansion cohorts. The company plans to present updated results from this trial at another scientific conference later this year.

*Slides from this presentation are available on the MacroGenics website at http://ir.macrogenics.com/events.cfm.

Photo by Patrick Pelletier

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended granting marketing authorization for Imatinib Teva B.V., a generic of Glivec.

The recommendation is that Imatinib Teva B.V. be approved to treat chronic myeloid leukemia (CML), acute lymphoblastic leukemia (ALL), hypereosinophilic syndrome (HES), chronic eosinophilic leukemia (CEL), myelodysplastic syndromes (MDS), myeloproliferative neoplasms (MPNs), gastrointestinal stromal tumors (GIST), and dermatofibrosarcoma protuberans (DFSP).

The European Commission typically adheres to the CHMP’s recommendations and delivers its final decision within 67 days of the CHMP’s recommendation.

The European Commission’s decision will be applicable to the entire European Economic Area—all member states of the European Union plus Iceland, Liechtenstein, and Norway.

If approved, Imatinib Teva B.V. will be available as capsules and film-coated tablets (100 mg and 400 mg). And it will be authorized:

• As monotherapy for pediatric patients with newly diagnosed, Philadelphia-chromosome-positive (Ph+) CML for whom bone marrow transplant is not considered the first line of treatment.
• As monotherapy for pediatric patients with Ph+ CML in chronic phase after failure of interferon-alpha therapy or in accelerated phase or blast crisis.
• As monotherapy for adults with Ph+ CML in blast crisis.
• Integrated with chemotherapy to treat adult and pediatric patients with newly diagnosed, Ph+ ALL.
• As monotherapy for adults with relapsed or refractory Ph+ ALL.
• As monotherapy for adults with MDS/MPNs associated with platelet-derived growth factor receptor gene re-arrangements.
• As monotherapy for adults with advanced HES and/or CEL with FIP1L1-PDGFRα rearrangement.
• As monotherapy for adults with Kit- (CD117-) positive, unresectable and/or metastatic malignant GISTs.
• For the adjuvant treatment of adults who are at significant risk of relapse following resection of Kit-positive GIST. Patients who have a low or very low risk of recurrence should not receive adjuvant treatment.
• As monotherapy for adults with unresectable DFSP and adults with recurrent and/or metastatic DFSP who are not eligible for surgery.

The CHMP said studies have demonstrated the satisfactory quality of Imatinib Teva B.V. and its bioequivalence to the reference product, Glivec.

In adult and pediatric patients, the effectiveness of imatinib is based on:

• Overall hematologic and cytogenetic response rates and progression-free survival in CML
• Hematologic and cytogenetic response rates in Ph+ ALL and MDS/MPNs
• Hematologic response rates in HES/CEL
• Objective response rates in adults with unresectable and/or metastatic GIST and DFSP
• Recurrence-free survival in adjuvant GIST.

The experience with imatinib in patients with MDS/MPNs associated with PDGFR gene re-arrangements is very limited. There are no controlled trials demonstrating a clinical benefit or increased survival for these diseases.

Photo by Patrick Pelletier

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended granting marketing authorization for Imatinib Teva B.V., a generic of Glivec.

The recommendation is that Imatinib Teva B.V. be approved to treat chronic myeloid leukemia (CML), acute lymphoblastic leukemia (ALL), hypereosinophilic syndrome (HES), chronic eosinophilic leukemia (CEL), myelodysplastic syndromes (MDS), myeloproliferative neoplasms (MPNs), gastrointestinal stromal tumors (GIST), and dermatofibrosarcoma protuberans (DFSP).

The European Commission typically adheres to the CHMP’s recommendations and delivers its final decision within 67 days of the CHMP’s recommendation.

The European Commission’s decision will be applicable to the entire European Economic Area—all member states of the European Union plus Iceland, Liechtenstein, and Norway.

If approved, Imatinib Teva B.V. will be available as capsules and film-coated tablets (100 mg and 400 mg). And it will be authorized:

• As monotherapy for pediatric patients with newly diagnosed, Philadelphia-chromosome-positive (Ph+) CML for whom bone marrow transplant is not considered the first line of treatment.
• As monotherapy for pediatric patients with Ph+ CML in chronic phase after failure of interferon-alpha therapy or in accelerated phase or blast crisis.
• As monotherapy for adults with Ph+ CML in blast crisis.
• Integrated with chemotherapy to treat adult and pediatric patients with newly diagnosed, Ph+ ALL.
• As monotherapy for adults with relapsed or refractory Ph+ ALL.
• As monotherapy for adults with MDS/MPNs associated with platelet-derived growth factor receptor gene re-arrangements.
• As monotherapy for adults with advanced HES and/or CEL with FIP1L1-PDGFRα rearrangement.
• As monotherapy for adults with Kit- (CD117-) positive, unresectable and/or metastatic malignant GISTs.
• For the adjuvant treatment of adults who are at significant risk of relapse following resection of Kit-positive GIST. Patients who have a low or very low risk of recurrence should not receive adjuvant treatment.
• As monotherapy for adults with unresectable DFSP and adults with recurrent and/or metastatic DFSP who are not eligible for surgery.

The CHMP said studies have demonstrated the satisfactory quality of Imatinib Teva B.V. and its bioequivalence to the reference product, Glivec.

In adult and pediatric patients, the effectiveness of imatinib is based on:

• Overall hematologic and cytogenetic response rates and progression-free survival in CML
• Hematologic and cytogenetic response rates in Ph+ ALL and MDS/MPNs
• Hematologic response rates in HES/CEL
• Objective response rates in adults with unresectable and/or metastatic GIST and DFSP
• Recurrence-free survival in adjuvant GIST.

The experience with imatinib in patients with MDS/MPNs associated with PDGFR gene re-arrangements is very limited. There are no controlled trials demonstrating a clinical benefit or increased survival for these diseases.

Photo by Patrick Pelletier

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended granting marketing authorization for Imatinib Teva B.V., a generic of Glivec.

The recommendation is that Imatinib Teva B.V. be approved to treat chronic myeloid leukemia (CML), acute lymphoblastic leukemia (ALL), hypereosinophilic syndrome (HES), chronic eosinophilic leukemia (CEL), myelodysplastic syndromes (MDS), myeloproliferative neoplasms (MPNs), gastrointestinal stromal tumors (GIST), and dermatofibrosarcoma protuberans (DFSP).

The European Commission typically adheres to the CHMP’s recommendations and delivers its final decision within 67 days of the CHMP’s recommendation.

The European Commission’s decision will be applicable to the entire European Economic Area—all member states of the European Union plus Iceland, Liechtenstein, and Norway.

If approved, Imatinib Teva B.V. will be available as capsules and film-coated tablets (100 mg and 400 mg). And it will be authorized:

• As monotherapy for pediatric patients with newly diagnosed, Philadelphia-chromosome-positive (Ph+) CML for whom bone marrow transplant is not considered the first line of treatment.
• As monotherapy for pediatric patients with Ph+ CML in chronic phase after failure of interferon-alpha therapy or in accelerated phase or blast crisis.
• As monotherapy for adults with Ph+ CML in blast crisis.
• Integrated with chemotherapy to treat adult and pediatric patients with newly diagnosed, Ph+ ALL.
• As monotherapy for adults with relapsed or refractory Ph+ ALL.
• As monotherapy for adults with MDS/MPNs associated with platelet-derived growth factor receptor gene re-arrangements.
• As monotherapy for adults with advanced HES and/or CEL with FIP1L1-PDGFRα rearrangement.
• As monotherapy for adults with Kit- (CD117-) positive, unresectable and/or metastatic malignant GISTs.
• For the adjuvant treatment of adults who are at significant risk of relapse following resection of Kit-positive GIST. Patients who have a low or very low risk of recurrence should not receive adjuvant treatment.
• As monotherapy for adults with unresectable DFSP and adults with recurrent and/or metastatic DFSP who are not eligible for surgery.

The CHMP said studies have demonstrated the satisfactory quality of Imatinib Teva B.V. and its bioequivalence to the reference product, Glivec.

In adult and pediatric patients, the effectiveness of imatinib is based on:

• Overall hematologic and cytogenetic response rates and progression-free survival in CML
• Hematologic and cytogenetic response rates in Ph+ ALL and MDS/MPNs
• Hematologic response rates in HES/CEL
• Objective response rates in adults with unresectable and/or metastatic GIST and DFSP
• Recurrence-free survival in adjuvant GIST.

The experience with imatinib in patients with MDS/MPNs associated with PDGFR gene re-arrangements is very limited. There are no controlled trials demonstrating a clinical benefit or increased survival for these diseases.

Mast cells

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended refusal of the marketing authorization for masitinib (Masipro).

Masitinib is a tyrosine kinase inhibitor being developed by AB Science to treat adults with smoldering or indolent severe systemic mastocytosis (SM).

To support the application for masitinib, AB Science presented data from a study involving 135 SM patients who had severe symptoms, including at least one of the following: itching, hot flashes, depression, and tiredness.

Researchers compared masitinib to placebo in these patients, looking for improvements in any of the symptoms during the first 24 weeks of treatment.

The CHMP said it was concerned about the reliability of the study results because a routine good clinical practice inspection at the study sites revealed serious failings in the way the study had been conducted.

In addition, major changes were made to the study design while the study was underway, which made the results difficult to interpret.

Finally, data on the safety of masitinib were limited. And the CHMP was concerned about side effects, including neutropenia and harmful effects on the skin and liver, which were particularly relevant because masitinib was intended to be used long-term.

Therefore, the CHMP concluded the benefits of masitinib do not appear to outweigh the risks, and the committee recommended the drug be refused marketing authorization.

The CHMP informed AB Science of this negative opinion in May, and the company asked the committee to re-examine its opinion. However, the CHMP ultimately concluded that masitinib should be refused marketing authorization.

AB Science said this decision does not have any consequences for patients in clinical trials or compassionate use programs of masitinib.

The company also said it intends to initiate a confirmatory study in patients with smoldering or indolent severe SM that is unresponsive to optimal symptomatic treatment in order to confirm the results from the first pivotal study.

Mast cells

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended refusal of the marketing authorization for masitinib (Masipro).

Masitinib is a tyrosine kinase inhibitor being developed by AB Science to treat adults with smoldering or indolent severe systemic mastocytosis (SM).

To support the application for masitinib, AB Science presented data from a study involving 135 SM patients who had severe symptoms, including at least one of the following: itching, hot flashes, depression, and tiredness.

Researchers compared masitinib to placebo in these patients, looking for improvements in any of the symptoms during the first 24 weeks of treatment.

The CHMP said it was concerned about the reliability of the study results because a routine good clinical practice inspection at the study sites revealed serious failings in the way the study had been conducted.

In addition, major changes were made to the study design while the study was underway, which made the results difficult to interpret.

Finally, data on the safety of masitinib were limited. And the CHMP was concerned about side effects, including neutropenia and harmful effects on the skin and liver, which were particularly relevant because masitinib was intended to be used long-term.

Therefore, the CHMP concluded the benefits of masitinib do not appear to outweigh the risks, and the committee recommended the drug be refused marketing authorization.

The CHMP informed AB Science of this negative opinion in May, and the company asked the committee to re-examine its opinion. However, the CHMP ultimately concluded that masitinib should be refused marketing authorization.

AB Science said this decision does not have any consequences for patients in clinical trials or compassionate use programs of masitinib.

The company also said it intends to initiate a confirmatory study in patients with smoldering or indolent severe SM that is unresponsive to optimal symptomatic treatment in order to confirm the results from the first pivotal study.

Mast cells

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended refusal of the marketing authorization for masitinib (Masipro).

Masitinib is a tyrosine kinase inhibitor being developed by AB Science to treat adults with smoldering or indolent severe systemic mastocytosis (SM).

To support the application for masitinib, AB Science presented data from a study involving 135 SM patients who had severe symptoms, including at least one of the following: itching, hot flashes, depression, and tiredness.

Researchers compared masitinib to placebo in these patients, looking for improvements in any of the symptoms during the first 24 weeks of treatment.

The CHMP said it was concerned about the reliability of the study results because a routine good clinical practice inspection at the study sites revealed serious failings in the way the study had been conducted.

In addition, major changes were made to the study design while the study was underway, which made the results difficult to interpret.

Finally, data on the safety of masitinib were limited. And the CHMP was concerned about side effects, including neutropenia and harmful effects on the skin and liver, which were particularly relevant because masitinib was intended to be used long-term.

Therefore, the CHMP concluded the benefits of masitinib do not appear to outweigh the risks, and the committee recommended the drug be refused marketing authorization.

The CHMP informed AB Science of this negative opinion in May, and the company asked the committee to re-examine its opinion. However, the CHMP ultimately concluded that masitinib should be refused marketing authorization.

AB Science said this decision does not have any consequences for patients in clinical trials or compassionate use programs of masitinib.

The company also said it intends to initiate a confirmatory study in patients with smoldering or indolent severe SM that is unresponsive to optimal symptomatic treatment in order to confirm the results from the first pivotal study.

Vials of drug

Mylan S.A.S. has withdrawn the European marketing authorization application for its pegfilgrastim biosimilar Fulphila, according to the European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP).

Fulphila was intended to be used to reduce the duration of neutropenia and the incidence of febrile neutropenia in adults receiving cytotoxic therapy for malignancy (except chronic myeloid leukemia and myelodysplastic syndromes).

Fulphila was intended to be highly similar to Neulasta, a solution for injection that contains the active substance pegfilgrastim.

To support the application for Fulphila, Mylan S.A.S. presented results of studies designed to show that Fulphila is highly similar to Neulasta in terms of chemical structure, purity, mechanism, safety, effectiveness, and immunogenicity.

Mylan S.A.S withdrew the application for Fulphila after the CHMP had evaluated the initial documentation the company provided on the drug and formulated a list of questions. The CHMP was assessing the company’s responses to the questions when the application was withdrawn.

At the time of the withdrawal, the CHMP had some concerns and was of the provisional opinion that Fulphila could not have been approved.

One of the CHMP’s main concerns was the lack of a certificate of Good Manufacturing Practice for the manufacturing site of the product. Other concerns related to the description of the manufacturing process, the control of impurities in the active substance, and the sterilization of the final product.

In a letter to the European Medicines Agency, Mylan S.A.S said it withdrew the application for Fulphila because a Good Manufacturing Practice certificate for the manufacturing site could not be obtained in the time available.

The application withdrawal does not impact ongoing clinical trials of Fulphila, and there are no compassionate use programs for the drug.

Mylan S.A.S said it plans to resubmit the application for Fulphila as soon as possible. The company is working to ensure “inspection readiness” at the Fulphila manufacturing site by October 2017.

Vials of drug

Mylan S.A.S. has withdrawn the European marketing authorization application for its pegfilgrastim biosimilar Fulphila, according to the European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP).

Fulphila was intended to be used to reduce the duration of neutropenia and the incidence of febrile neutropenia in adults receiving cytotoxic therapy for malignancy (except chronic myeloid leukemia and myelodysplastic syndromes).

Fulphila was intended to be highly similar to Neulasta, a solution for injection that contains the active substance pegfilgrastim.

To support the application for Fulphila, Mylan S.A.S. presented results of studies designed to show that Fulphila is highly similar to Neulasta in terms of chemical structure, purity, mechanism, safety, effectiveness, and immunogenicity.

Mylan S.A.S withdrew the application for Fulphila after the CHMP had evaluated the initial documentation the company provided on the drug and formulated a list of questions. The CHMP was assessing the company’s responses to the questions when the application was withdrawn.

At the time of the withdrawal, the CHMP had some concerns and was of the provisional opinion that Fulphila could not have been approved.

One of the CHMP’s main concerns was the lack of a certificate of Good Manufacturing Practice for the manufacturing site of the product. Other concerns related to the description of the manufacturing process, the control of impurities in the active substance, and the sterilization of the final product.

In a letter to the European Medicines Agency, Mylan S.A.S said it withdrew the application for Fulphila because a Good Manufacturing Practice certificate for the manufacturing site could not be obtained in the time available.

The application withdrawal does not impact ongoing clinical trials of Fulphila, and there are no compassionate use programs for the drug.

Mylan S.A.S said it plans to resubmit the application for Fulphila as soon as possible. The company is working to ensure “inspection readiness” at the Fulphila manufacturing site by October 2017.

Vials of drug

Mylan S.A.S. has withdrawn the European marketing authorization application for its pegfilgrastim biosimilar Fulphila, according to the European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP).

Fulphila was intended to be used to reduce the duration of neutropenia and the incidence of febrile neutropenia in adults receiving cytotoxic therapy for malignancy (except chronic myeloid leukemia and myelodysplastic syndromes).

Fulphila was intended to be highly similar to Neulasta, a solution for injection that contains the active substance pegfilgrastim.

To support the application for Fulphila, Mylan S.A.S. presented results of studies designed to show that Fulphila is highly similar to Neulasta in terms of chemical structure, purity, mechanism, safety, effectiveness, and immunogenicity.

Mylan S.A.S withdrew the application for Fulphila after the CHMP had evaluated the initial documentation the company provided on the drug and formulated a list of questions. The CHMP was assessing the company’s responses to the questions when the application was withdrawn.

At the time of the withdrawal, the CHMP had some concerns and was of the provisional opinion that Fulphila could not have been approved.

One of the CHMP’s main concerns was the lack of a certificate of Good Manufacturing Practice for the manufacturing site of the product. Other concerns related to the description of the manufacturing process, the control of impurities in the active substance, and the sterilization of the final product.

In a letter to the European Medicines Agency, Mylan S.A.S said it withdrew the application for Fulphila because a Good Manufacturing Practice certificate for the manufacturing site could not be obtained in the time available.

The application withdrawal does not impact ongoing clinical trials of Fulphila, and there are no compassionate use programs for the drug.

Mylan S.A.S said it plans to resubmit the application for Fulphila as soon as possible. The company is working to ensure “inspection readiness” at the Fulphila manufacturing site by October 2017.

Photo from Novartis

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended expanding the authorized use for nilotinib (Tasigna) to include pediatric patients.

At present, nilotinib is approved for use in the European Economic Area to treat adults with chronic myeloid leukemia (CML).

The drug is used to treat adults with newly diagnosed, Philadelphia-chromosome-positive (Ph+), chronic phase CML and adults with chronic or accelerated phase, Ph+ CML with resistance or intolerance to prior therapy, including imatinib.

The CHMP has recommended expanding the marketing authorization of nilotinib to include pediatric patients with newly diagnosed, Ph+, chronic phase CML and pediatric patients with chronic phase, Ph+ CML with resistance or intolerance to prior therapy, including imatinib.

Detailed recommendations for the use of nilotinib will be described in the updated summary of product characteristics, which will be published in the revised European public assessment report. It will be available in all official European Union languages after a decision on this change to the marketing authorization has been granted by the European Commission (EC).

The EC typically adheres to the CHMP’s recommendations and delivers its final decision within 67 days of the CHMP’s recommendation.

The EC’s decision will be applicable to the entire European Economic Area—all member states of the European Union plus Iceland, Liechtenstein, and Norway.

Photo from Novartis

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended expanding the authorized use for nilotinib (Tasigna) to include pediatric patients.

At present, nilotinib is approved for use in the European Economic Area to treat adults with chronic myeloid leukemia (CML).

The drug is used to treat adults with newly diagnosed, Philadelphia-chromosome-positive (Ph+), chronic phase CML and adults with chronic or accelerated phase, Ph+ CML with resistance or intolerance to prior therapy, including imatinib.

The CHMP has recommended expanding the marketing authorization of nilotinib to include pediatric patients with newly diagnosed, Ph+, chronic phase CML and pediatric patients with chronic phase, Ph+ CML with resistance or intolerance to prior therapy, including imatinib.

Detailed recommendations for the use of nilotinib will be described in the updated summary of product characteristics, which will be published in the revised European public assessment report. It will be available in all official European Union languages after a decision on this change to the marketing authorization has been granted by the European Commission (EC).

The EC typically adheres to the CHMP’s recommendations and delivers its final decision within 67 days of the CHMP’s recommendation.

The EC’s decision will be applicable to the entire European Economic Area—all member states of the European Union plus Iceland, Liechtenstein, and Norway.

Photo from Novartis

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended expanding the authorized use for nilotinib (Tasigna) to include pediatric patients.

At present, nilotinib is approved for use in the European Economic Area to treat adults with chronic myeloid leukemia (CML).

The drug is used to treat adults with newly diagnosed, Philadelphia-chromosome-positive (Ph+), chronic phase CML and adults with chronic or accelerated phase, Ph+ CML with resistance or intolerance to prior therapy, including imatinib.

The CHMP has recommended expanding the marketing authorization of nilotinib to include pediatric patients with newly diagnosed, Ph+, chronic phase CML and pediatric patients with chronic phase, Ph+ CML with resistance or intolerance to prior therapy, including imatinib.

Detailed recommendations for the use of nilotinib will be described in the updated summary of product characteristics, which will be published in the revised European public assessment report. It will be available in all official European Union languages after a decision on this change to the marketing authorization has been granted by the European Commission (EC).

The EC typically adheres to the CHMP’s recommendations and delivers its final decision within 67 days of the CHMP’s recommendation.

The EC’s decision will be applicable to the entire European Economic Area—all member states of the European Union plus Iceland, Liechtenstein, and Norway.