AML

Individuals who develop acute myeloid leukemia (AML) may have somatic mutations detectable years before diagnosis, a newly published analysis shows.

Mutations in IDH1, IDH2, TP53, DNMT3A, TET2, and spliceosome genes at baseline assessment increased the odds of developing AML with a median follow-up of 9.6 years in the study, which was based on blood samples from participants in the Women’s Health Initiative (WHI).

The findings suggest a “premalignant landscape of mutations” that may precede overt AML by many years, according to Pinkal Desai, MD, assistant professor of medicine at Cornell University and oncologist at New York–Presbyterian/Weill Cornell Medical Center, New York, and her coauthors.

“The ability to detect and identify high-risk mutations suggests that monitoring strategies for patients, as well as clinical trials of potentially preventative or disease-intercepting interventions should be considered,” wrote Dr. Desai and her colleagues. The report was published in Nature Medicine.

Their analysis comprised 212 women who participated in the WHI who were healthy at the baseline evaluation but went on to develop AML during follow-up. They performed deep sequencing on peripheral blood DNA for these cases and for 212 age-matched controls.

Women who developed AML were more likely than were controls to have mutations in baseline assessment (odds ratio, 4.86; 95% confidence interval, 3.07-7.77), and had demonstrated greater clonal complexity versus controls (comutations in 46.8% and 5.5%, respectively; odds ratio, 9.01; 95% CI, 4.1-21.4), investigators found.

©GunarsB/Thinkstock

All 21 patients with TP53 mutations went on to develop AML, as did all 15 with IDH1 or IDH2 mutations and all 3 with RUNX1 mutations. Multivariate analysis showed that TP53, IDH1 and IDH2, TET2, DNMT3A and several spliceosome genes were associated with significantly increased odds of AML versus controls.

Based on these results, Dr. Desai and colleagues proposed that patients at increased AML risk should be followed in long-term monitoring studies that incorporate next-generation sequencing.

“Data from these studies will provide a robust rationale for clinical trials of preventative intervention strategies in populations at high risk of developing AML,” they wrote.

In clinical practice, monitoring individuals for AML-associated mutations will become more feasible as costs decrease and new therapies with favorable toxicity profiles are introduced, they added.

“Molecularly targeted therapy is already available for IDH2 mutations and is under development for mutations in other candidate genes found in this study including IDH1, TP53 and spliceosome genes,” they wrote.

The authors reported having no relevant financial disclosures. The WHI program is funded by the National Institutes of Health.

SOURCE: Desai P et al. Nat Med. 2018;24:1015-23.

Individuals who develop acute myeloid leukemia (AML) may have somatic mutations detectable years before diagnosis, a newly published analysis shows.

Mutations in IDH1, IDH2, TP53, DNMT3A, TET2, and spliceosome genes at baseline assessment increased the odds of developing AML with a median follow-up of 9.6 years in the study, which was based on blood samples from participants in the Women’s Health Initiative (WHI).

The findings suggest a “premalignant landscape of mutations” that may precede overt AML by many years, according to Pinkal Desai, MD, assistant professor of medicine at Cornell University and oncologist at New York–Presbyterian/Weill Cornell Medical Center, New York, and her coauthors.

“The ability to detect and identify high-risk mutations suggests that monitoring strategies for patients, as well as clinical trials of potentially preventative or disease-intercepting interventions should be considered,” wrote Dr. Desai and her colleagues. The report was published in Nature Medicine.

Their analysis comprised 212 women who participated in the WHI who were healthy at the baseline evaluation but went on to develop AML during follow-up. They performed deep sequencing on peripheral blood DNA for these cases and for 212 age-matched controls.

Women who developed AML were more likely than were controls to have mutations in baseline assessment (odds ratio, 4.86; 95% confidence interval, 3.07-7.77), and had demonstrated greater clonal complexity versus controls (comutations in 46.8% and 5.5%, respectively; odds ratio, 9.01; 95% CI, 4.1-21.4), investigators found.

©GunarsB/Thinkstock

All 21 patients with TP53 mutations went on to develop AML, as did all 15 with IDH1 or IDH2 mutations and all 3 with RUNX1 mutations. Multivariate analysis showed that TP53, IDH1 and IDH2, TET2, DNMT3A and several spliceosome genes were associated with significantly increased odds of AML versus controls.

Based on these results, Dr. Desai and colleagues proposed that patients at increased AML risk should be followed in long-term monitoring studies that incorporate next-generation sequencing.

“Data from these studies will provide a robust rationale for clinical trials of preventative intervention strategies in populations at high risk of developing AML,” they wrote.

In clinical practice, monitoring individuals for AML-associated mutations will become more feasible as costs decrease and new therapies with favorable toxicity profiles are introduced, they added.

“Molecularly targeted therapy is already available for IDH2 mutations and is under development for mutations in other candidate genes found in this study including IDH1, TP53 and spliceosome genes,” they wrote.

The authors reported having no relevant financial disclosures. The WHI program is funded by the National Institutes of Health.

SOURCE: Desai P et al. Nat Med. 2018;24:1015-23.

Individuals who develop acute myeloid leukemia (AML) may have somatic mutations detectable years before diagnosis, a newly published analysis shows.

Mutations in IDH1, IDH2, TP53, DNMT3A, TET2, and spliceosome genes at baseline assessment increased the odds of developing AML with a median follow-up of 9.6 years in the study, which was based on blood samples from participants in the Women’s Health Initiative (WHI).

The findings suggest a “premalignant landscape of mutations” that may precede overt AML by many years, according to Pinkal Desai, MD, assistant professor of medicine at Cornell University and oncologist at New York–Presbyterian/Weill Cornell Medical Center, New York, and her coauthors.

“The ability to detect and identify high-risk mutations suggests that monitoring strategies for patients, as well as clinical trials of potentially preventative or disease-intercepting interventions should be considered,” wrote Dr. Desai and her colleagues. The report was published in Nature Medicine.

Their analysis comprised 212 women who participated in the WHI who were healthy at the baseline evaluation but went on to develop AML during follow-up. They performed deep sequencing on peripheral blood DNA for these cases and for 212 age-matched controls.

Women who developed AML were more likely than were controls to have mutations in baseline assessment (odds ratio, 4.86; 95% confidence interval, 3.07-7.77), and had demonstrated greater clonal complexity versus controls (comutations in 46.8% and 5.5%, respectively; odds ratio, 9.01; 95% CI, 4.1-21.4), investigators found.

©GunarsB/Thinkstock

All 21 patients with TP53 mutations went on to develop AML, as did all 15 with IDH1 or IDH2 mutations and all 3 with RUNX1 mutations. Multivariate analysis showed that TP53, IDH1 and IDH2, TET2, DNMT3A and several spliceosome genes were associated with significantly increased odds of AML versus controls.

Based on these results, Dr. Desai and colleagues proposed that patients at increased AML risk should be followed in long-term monitoring studies that incorporate next-generation sequencing.

“Data from these studies will provide a robust rationale for clinical trials of preventative intervention strategies in populations at high risk of developing AML,” they wrote.

In clinical practice, monitoring individuals for AML-associated mutations will become more feasible as costs decrease and new therapies with favorable toxicity profiles are introduced, they added.

“Molecularly targeted therapy is already available for IDH2 mutations and is under development for mutations in other candidate genes found in this study including IDH1, TP53 and spliceosome genes,” they wrote.

The authors reported having no relevant financial disclosures. The WHI program is funded by the National Institutes of Health.

SOURCE: Desai P et al. Nat Med. 2018;24:1015-23.

Image by Volker Brinkmann

Preclinical research suggests ibrutinib could treat G-CSFR-mutant myeloid disorders.

“Mutations in G-CSFR have a harmful effect on the production of neutrophils and are reported in patients with several blood disorders, including severe congenital neutropenia, chronic neutrophilic leukemia, and acute myeloid leukemia,” said Ken Greis, PhD, of the University of Cincinnati in Ohio.

“Unfortunately, despite years of research, the malignant signaling of the mutated G-CSFRs is not well understood.”

With this in mind, Dr Greis and his colleagues created a comprehensive signaling network of normal and mutated G-CSFR. Their goal was to understand how abnormal cellular signaling from the mutant receptors results in disease development.

The researchers described this work in Leukemia.

“We are able to look at . . . phosphorylation that results in phosphate groups being attached to the amino acid tyrosine (Tyr) in proteins,” Dr Greis explained. “These phosphorylation events (pTyr) can act as switches to activate or inactivate proteins and/or specific cellular processes.”

“By evaluating pTyr activity in the normal versus mutant receptor cells, we can produce a network similar to a wiring diagram of cellular regulation. Observed disruptions at any of the nodes in the network for the mutated receptors can then be investigated further to understand and perhaps target the abnormal signaling corresponding to the disease.”

This analysis of pTyr activity revealed that G-CSFR mutants had aberrant activation of BTK, as well as abnormal kinetics of canonical STAT3, STAT5, and MAPK phosphorylation.

“When we first got these results, one of the most exciting things was that BTK was already the target of an FDA-approved drug, ibrutinib . . .,” said study author H. Leighton Grimes, PhD, of the University of Cincinnati.

The researchers tested ibrutinib in cells with mutant and wild-type G-CSFR and found the drug killed the mutant cells but not the wild-type cells. This was the case in myeloid progenitor 32D cell lines and primary human CD34+ umbilical cord blood cells.

“Progenitor cells expressing mutated G-CSFR in animal models and in human blood cells also showed enhanced sensitivity to ibrutinib compared to the normal G-CSFR, thus confirming that the mutated cells could likely be eliminated by treatment with ibrutinib and may represent an effective therapy for these patients,” Dr Grimes said.

Ibrutinib also demonstrated synergy with the JAK1/2 inhibitor ruxolitinib. G-CSFR-mutant CD34+ cells were sensitive to each drug alone, but combining them “dramatically enhanced” the sensitivity, according to the researchers.

“These data demonstrate the strength of global proteomics approaches, like the pTyr profiling used here, in dissecting cancer-forming pathways and points to the possibility that ibrutinib could be an effective therapy for myeloid leukemias with G-CSFR mutations,” Dr Greis said.

“Further studies are needed to determine if these findings will be applicable in patient samples, but the hope is that clinical trials are just around the corner, since we’re investigating a drug that has already been found to be safe by the FDA.”

Image by Volker Brinkmann

Preclinical research suggests ibrutinib could treat G-CSFR-mutant myeloid disorders.

“Mutations in G-CSFR have a harmful effect on the production of neutrophils and are reported in patients with several blood disorders, including severe congenital neutropenia, chronic neutrophilic leukemia, and acute myeloid leukemia,” said Ken Greis, PhD, of the University of Cincinnati in Ohio.

“Unfortunately, despite years of research, the malignant signaling of the mutated G-CSFRs is not well understood.”

With this in mind, Dr Greis and his colleagues created a comprehensive signaling network of normal and mutated G-CSFR. Their goal was to understand how abnormal cellular signaling from the mutant receptors results in disease development.

The researchers described this work in Leukemia.

“We are able to look at . . . phosphorylation that results in phosphate groups being attached to the amino acid tyrosine (Tyr) in proteins,” Dr Greis explained. “These phosphorylation events (pTyr) can act as switches to activate or inactivate proteins and/or specific cellular processes.”

“By evaluating pTyr activity in the normal versus mutant receptor cells, we can produce a network similar to a wiring diagram of cellular regulation. Observed disruptions at any of the nodes in the network for the mutated receptors can then be investigated further to understand and perhaps target the abnormal signaling corresponding to the disease.”

This analysis of pTyr activity revealed that G-CSFR mutants had aberrant activation of BTK, as well as abnormal kinetics of canonical STAT3, STAT5, and MAPK phosphorylation.

“When we first got these results, one of the most exciting things was that BTK was already the target of an FDA-approved drug, ibrutinib . . .,” said study author H. Leighton Grimes, PhD, of the University of Cincinnati.

The researchers tested ibrutinib in cells with mutant and wild-type G-CSFR and found the drug killed the mutant cells but not the wild-type cells. This was the case in myeloid progenitor 32D cell lines and primary human CD34+ umbilical cord blood cells.

“Progenitor cells expressing mutated G-CSFR in animal models and in human blood cells also showed enhanced sensitivity to ibrutinib compared to the normal G-CSFR, thus confirming that the mutated cells could likely be eliminated by treatment with ibrutinib and may represent an effective therapy for these patients,” Dr Grimes said.

Ibrutinib also demonstrated synergy with the JAK1/2 inhibitor ruxolitinib. G-CSFR-mutant CD34+ cells were sensitive to each drug alone, but combining them “dramatically enhanced” the sensitivity, according to the researchers.

“These data demonstrate the strength of global proteomics approaches, like the pTyr profiling used here, in dissecting cancer-forming pathways and points to the possibility that ibrutinib could be an effective therapy for myeloid leukemias with G-CSFR mutations,” Dr Greis said.

“Further studies are needed to determine if these findings will be applicable in patient samples, but the hope is that clinical trials are just around the corner, since we’re investigating a drug that has already been found to be safe by the FDA.”

Image by Volker Brinkmann

Preclinical research suggests ibrutinib could treat G-CSFR-mutant myeloid disorders.

“Mutations in G-CSFR have a harmful effect on the production of neutrophils and are reported in patients with several blood disorders, including severe congenital neutropenia, chronic neutrophilic leukemia, and acute myeloid leukemia,” said Ken Greis, PhD, of the University of Cincinnati in Ohio.

“Unfortunately, despite years of research, the malignant signaling of the mutated G-CSFRs is not well understood.”

With this in mind, Dr Greis and his colleagues created a comprehensive signaling network of normal and mutated G-CSFR. Their goal was to understand how abnormal cellular signaling from the mutant receptors results in disease development.

The researchers described this work in Leukemia.

“We are able to look at . . . phosphorylation that results in phosphate groups being attached to the amino acid tyrosine (Tyr) in proteins,” Dr Greis explained. “These phosphorylation events (pTyr) can act as switches to activate or inactivate proteins and/or specific cellular processes.”

“By evaluating pTyr activity in the normal versus mutant receptor cells, we can produce a network similar to a wiring diagram of cellular regulation. Observed disruptions at any of the nodes in the network for the mutated receptors can then be investigated further to understand and perhaps target the abnormal signaling corresponding to the disease.”

This analysis of pTyr activity revealed that G-CSFR mutants had aberrant activation of BTK, as well as abnormal kinetics of canonical STAT3, STAT5, and MAPK phosphorylation.

“When we first got these results, one of the most exciting things was that BTK was already the target of an FDA-approved drug, ibrutinib . . .,” said study author H. Leighton Grimes, PhD, of the University of Cincinnati.

The researchers tested ibrutinib in cells with mutant and wild-type G-CSFR and found the drug killed the mutant cells but not the wild-type cells. This was the case in myeloid progenitor 32D cell lines and primary human CD34+ umbilical cord blood cells.

“Progenitor cells expressing mutated G-CSFR in animal models and in human blood cells also showed enhanced sensitivity to ibrutinib compared to the normal G-CSFR, thus confirming that the mutated cells could likely be eliminated by treatment with ibrutinib and may represent an effective therapy for these patients,” Dr Grimes said.

Ibrutinib also demonstrated synergy with the JAK1/2 inhibitor ruxolitinib. G-CSFR-mutant CD34+ cells were sensitive to each drug alone, but combining them “dramatically enhanced” the sensitivity, according to the researchers.

“These data demonstrate the strength of global proteomics approaches, like the pTyr profiling used here, in dissecting cancer-forming pathways and points to the possibility that ibrutinib could be an effective therapy for myeloid leukemias with G-CSFR mutations,” Dr Greis said.

“Further studies are needed to determine if these findings will be applicable in patient samples, but the hope is that clinical trials are just around the corner, since we’re investigating a drug that has already been found to be safe by the FDA.”

STOCKHOLM – For fit, older patients with acute myeloid leukemia (AML), a combination of venetoclax and attenuated-dose induction chemotherapy is tolerable and associated with high response rates, results of the phase 1b CAVEAT trial have suggested.

There was one dose-limiting toxicity in a patient in cohort E (600 mg venetoclax). There were three deaths, all from sepsis, during the induction period (within 42 days) and one after 42 days. The deaths occurred in cohorts C, D, and E.

At the time of data cutoff, two patients had completed treatment, six were continuing, and 33 had discontinued. The primary reason for discontinuation was disease relapse, followed by refractory disease, adverse events, dose-limiting toxicity, or physician/patient decision.

Other adverse events included infections, including grade 3 infections in all 16 patients treated at the 400 mg and 600 mg levels, as well as sepsis, febrile neutropenia, and grade 3 rapid atrial fibrillation in two patients treated in the 400 mg and 600 mg venetoclax cohorts.“Overall, the impression from the investigators was that this is a very deliverable and well-tolerated regimen,” Dr. Wei said.

The overall combined CR/CRi rate was 71%, including CR/CRi in all 9 patients in the 200 mg venetoclax dose cohort.

“Even just with 1 week of monotherapy venetoclax exposure, 25% of patients had a 50% reduction in their bone marrow blasts,” Dr. Wei said.

Median overall survival among the 37 evaluable patients was 7.7 months. Among 12 patients who achieved a CR, the median overall survival was 18.5 months, and among the 12 patients with a CRi, the median overall survival was 7.7 months. For the remaining 13 patients, the median overall survival was 6.3 months.

Survival was significantly better for patients who were treatment-naive prior to venetoclax and chemotherapy, at a median of 18.6 months, compared with 3.8 months for patients who had previously received a hypomethylating agent and/or low-dose cytarabine (P = .0018).

Dose expansion of the 600-mg cohort is ongoing to provide better perspectives on efficacy.

The findings provide evidence that venetoclax monotherapy has cytoreductive potential and support future exploration of venetoclax in combination with 7+3 chemotherapy in younger, fit adults with AML, Dr. Wei said.

The study was supported by AbbVie/Genentech, the Victorian Cancer Agency, and the National Health and Medical Research Council of Australia. Dr. Wei reported research support and advisory board activities with AbbVie and other companies.

SOURCE: Wei AH et al. EHA Congress, Abstract S1564.

STOCKHOLM – For fit, older patients with acute myeloid leukemia (AML), a combination of venetoclax and attenuated-dose induction chemotherapy is tolerable and associated with high response rates, results of the phase 1b CAVEAT trial have suggested.

There was one dose-limiting toxicity in a patient in cohort E (600 mg venetoclax). There were three deaths, all from sepsis, during the induction period (within 42 days) and one after 42 days. The deaths occurred in cohorts C, D, and E.

At the time of data cutoff, two patients had completed treatment, six were continuing, and 33 had discontinued. The primary reason for discontinuation was disease relapse, followed by refractory disease, adverse events, dose-limiting toxicity, or physician/patient decision.

Other adverse events included infections, including grade 3 infections in all 16 patients treated at the 400 mg and 600 mg levels, as well as sepsis, febrile neutropenia, and grade 3 rapid atrial fibrillation in two patients treated in the 400 mg and 600 mg venetoclax cohorts.“Overall, the impression from the investigators was that this is a very deliverable and well-tolerated regimen,” Dr. Wei said.

The overall combined CR/CRi rate was 71%, including CR/CRi in all 9 patients in the 200 mg venetoclax dose cohort.

“Even just with 1 week of monotherapy venetoclax exposure, 25% of patients had a 50% reduction in their bone marrow blasts,” Dr. Wei said.

Median overall survival among the 37 evaluable patients was 7.7 months. Among 12 patients who achieved a CR, the median overall survival was 18.5 months, and among the 12 patients with a CRi, the median overall survival was 7.7 months. For the remaining 13 patients, the median overall survival was 6.3 months.

Survival was significantly better for patients who were treatment-naive prior to venetoclax and chemotherapy, at a median of 18.6 months, compared with 3.8 months for patients who had previously received a hypomethylating agent and/or low-dose cytarabine (P = .0018).

Dose expansion of the 600-mg cohort is ongoing to provide better perspectives on efficacy.

The findings provide evidence that venetoclax monotherapy has cytoreductive potential and support future exploration of venetoclax in combination with 7+3 chemotherapy in younger, fit adults with AML, Dr. Wei said.

The study was supported by AbbVie/Genentech, the Victorian Cancer Agency, and the National Health and Medical Research Council of Australia. Dr. Wei reported research support and advisory board activities with AbbVie and other companies.

SOURCE: Wei AH et al. EHA Congress, Abstract S1564.

STOCKHOLM – For fit, older patients with acute myeloid leukemia (AML), a combination of venetoclax and attenuated-dose induction chemotherapy is tolerable and associated with high response rates, results of the phase 1b CAVEAT trial have suggested.

There was one dose-limiting toxicity in a patient in cohort E (600 mg venetoclax). There were three deaths, all from sepsis, during the induction period (within 42 days) and one after 42 days. The deaths occurred in cohorts C, D, and E.

At the time of data cutoff, two patients had completed treatment, six were continuing, and 33 had discontinued. The primary reason for discontinuation was disease relapse, followed by refractory disease, adverse events, dose-limiting toxicity, or physician/patient decision.

Other adverse events included infections, including grade 3 infections in all 16 patients treated at the 400 mg and 600 mg levels, as well as sepsis, febrile neutropenia, and grade 3 rapid atrial fibrillation in two patients treated in the 400 mg and 600 mg venetoclax cohorts.“Overall, the impression from the investigators was that this is a very deliverable and well-tolerated regimen,” Dr. Wei said.

The overall combined CR/CRi rate was 71%, including CR/CRi in all 9 patients in the 200 mg venetoclax dose cohort.

“Even just with 1 week of monotherapy venetoclax exposure, 25% of patients had a 50% reduction in their bone marrow blasts,” Dr. Wei said.

Median overall survival among the 37 evaluable patients was 7.7 months. Among 12 patients who achieved a CR, the median overall survival was 18.5 months, and among the 12 patients with a CRi, the median overall survival was 7.7 months. For the remaining 13 patients, the median overall survival was 6.3 months.

Survival was significantly better for patients who were treatment-naive prior to venetoclax and chemotherapy, at a median of 18.6 months, compared with 3.8 months for patients who had previously received a hypomethylating agent and/or low-dose cytarabine (P = .0018).

Dose expansion of the 600-mg cohort is ongoing to provide better perspectives on efficacy.

The findings provide evidence that venetoclax monotherapy has cytoreductive potential and support future exploration of venetoclax in combination with 7+3 chemotherapy in younger, fit adults with AML, Dr. Wei said.

The study was supported by AbbVie/Genentech, the Victorian Cancer Agency, and the National Health and Medical Research Council of Australia. Dr. Wei reported research support and advisory board activities with AbbVie and other companies.

SOURCE: Wei AH et al. EHA Congress, Abstract S1564.

Photo by Rhoda Baer

The US Food and Drug Administration (FDA) has granted regenerative medicine advanced therapy (RMAT) designation for romyelocel-L, a myeloid progenitor cell therapy that doesn’t require HLA matching.

Romyelocel-L (CLT-008) is being developed as prophylaxis for serious bacterial and fungal infections in patients with de novo acute myeloid leukemia (AML) who develop neutropenia while receiving induction chemotherapy.

The FDA grants RMAT designation to therapies intended to treat serious or life-threatening conditions if there is preliminary clinical evidence that the therapies could address unmet medical needs.

RMAT designation provides similar advantages as breakthrough therapy designation, including early interactions with the FDA to discuss potential ways to accelerate the development of a therapy toward regulatory approval.

The FDA granted romyelocel-L RMAT designation based on a randomized, phase 2 trial of newly diagnosed AML patients who received induction consisting of cytarabine and an anthracycline.

Results from this trial were presented at the 2018 ASCO Annual Meeting (abstract 7043).

The trial enrolled 163 AML patients and randomized them, on the first day of induction, to receive:

• Daily granulocyte colony-stimulating factor (G-CSF) starting on day 14 (n=84)
• Romyelocel-L (7.5 x 10⁶cells/kg) on day 9 plus daily G-CSF starting on day 14 (n=79).

Patients received G-CSF until neutrophil recovery to at least 500/µL.

Baseline characteristics were well balanced between the treatment arms.

There were 120 evaluable patients—59 in the romyelocel-L arm and 61 in the control arm.

The study’s primary endpoint was days in a febrile episode (DFE). The mean DFE from day 9 to 28 was 6.46 days in the romyelocel-L arm and 6.86 days in the control arm (P=0.350). The mean DFE for days 15 to 28 was 2.36 and 3.90, respectively (P=0.020).

The incidence of microbiologically or clinically diagnosed infection from day 9 to 28 was 35.6% in the romyelocel-L arm and 47.5% in the control arm, a decrease of 25% (P=0.089).

From day 15 to 28 the incidence of infection was 6.8% in the romyelocel-L arm and 27.9% in the control arm, a decrease of 76% (P=0.002).

There were no infectious deaths in the romyelocel-L arm but 2 deaths attributed to pneumonia in the control arm.

The mean hospital stay was 25.5 days in the romyelocel-L arm and 28.7 days in the control arm (P=0.002).

The proportion of patients with serious adverse events (AEs) was 14% in the romyelocel-L arm and 18% in the control arm. The proportion of patients with infectious serious AEs was 50% and 77%, respectively.

The most frequent treatment-emergent AEs (in the romyelocel-L and control arms, respectively) were febrile neutropenia (31.4% and 31%), diarrhea (25.7% and 32.4%), hypokalemia (31.4% and 25.4%), hypophosphatemia (21.4% and 23.9%), and pyrexia (22.9% and 22.5%).

There were no cases of graft-versus-host disease.  

Photo by Rhoda Baer

The US Food and Drug Administration (FDA) has granted regenerative medicine advanced therapy (RMAT) designation for romyelocel-L, a myeloid progenitor cell therapy that doesn’t require HLA matching.

Romyelocel-L (CLT-008) is being developed as prophylaxis for serious bacterial and fungal infections in patients with de novo acute myeloid leukemia (AML) who develop neutropenia while receiving induction chemotherapy.

The FDA grants RMAT designation to therapies intended to treat serious or life-threatening conditions if there is preliminary clinical evidence that the therapies could address unmet medical needs.

RMAT designation provides similar advantages as breakthrough therapy designation, including early interactions with the FDA to discuss potential ways to accelerate the development of a therapy toward regulatory approval.

The FDA granted romyelocel-L RMAT designation based on a randomized, phase 2 trial of newly diagnosed AML patients who received induction consisting of cytarabine and an anthracycline.

Results from this trial were presented at the 2018 ASCO Annual Meeting (abstract 7043).

The trial enrolled 163 AML patients and randomized them, on the first day of induction, to receive:

• Daily granulocyte colony-stimulating factor (G-CSF) starting on day 14 (n=84)
• Romyelocel-L (7.5 x 10⁶cells/kg) on day 9 plus daily G-CSF starting on day 14 (n=79).

Patients received G-CSF until neutrophil recovery to at least 500/µL.

Baseline characteristics were well balanced between the treatment arms.

There were 120 evaluable patients—59 in the romyelocel-L arm and 61 in the control arm.

The study’s primary endpoint was days in a febrile episode (DFE). The mean DFE from day 9 to 28 was 6.46 days in the romyelocel-L arm and 6.86 days in the control arm (P=0.350). The mean DFE for days 15 to 28 was 2.36 and 3.90, respectively (P=0.020).

The incidence of microbiologically or clinically diagnosed infection from day 9 to 28 was 35.6% in the romyelocel-L arm and 47.5% in the control arm, a decrease of 25% (P=0.089).

From day 15 to 28 the incidence of infection was 6.8% in the romyelocel-L arm and 27.9% in the control arm, a decrease of 76% (P=0.002).

There were no infectious deaths in the romyelocel-L arm but 2 deaths attributed to pneumonia in the control arm.

The mean hospital stay was 25.5 days in the romyelocel-L arm and 28.7 days in the control arm (P=0.002).

The proportion of patients with serious adverse events (AEs) was 14% in the romyelocel-L arm and 18% in the control arm. The proportion of patients with infectious serious AEs was 50% and 77%, respectively.

The most frequent treatment-emergent AEs (in the romyelocel-L and control arms, respectively) were febrile neutropenia (31.4% and 31%), diarrhea (25.7% and 32.4%), hypokalemia (31.4% and 25.4%), hypophosphatemia (21.4% and 23.9%), and pyrexia (22.9% and 22.5%).

There were no cases of graft-versus-host disease.  

Photo by Rhoda Baer

The US Food and Drug Administration (FDA) has granted regenerative medicine advanced therapy (RMAT) designation for romyelocel-L, a myeloid progenitor cell therapy that doesn’t require HLA matching.

Romyelocel-L (CLT-008) is being developed as prophylaxis for serious bacterial and fungal infections in patients with de novo acute myeloid leukemia (AML) who develop neutropenia while receiving induction chemotherapy.

The FDA grants RMAT designation to therapies intended to treat serious or life-threatening conditions if there is preliminary clinical evidence that the therapies could address unmet medical needs.

RMAT designation provides similar advantages as breakthrough therapy designation, including early interactions with the FDA to discuss potential ways to accelerate the development of a therapy toward regulatory approval.

The FDA granted romyelocel-L RMAT designation based on a randomized, phase 2 trial of newly diagnosed AML patients who received induction consisting of cytarabine and an anthracycline.

Results from this trial were presented at the 2018 ASCO Annual Meeting (abstract 7043).

The trial enrolled 163 AML patients and randomized them, on the first day of induction, to receive:

• Daily granulocyte colony-stimulating factor (G-CSF) starting on day 14 (n=84)
• Romyelocel-L (7.5 x 10⁶cells/kg) on day 9 plus daily G-CSF starting on day 14 (n=79).

Patients received G-CSF until neutrophil recovery to at least 500/µL.

Baseline characteristics were well balanced between the treatment arms.

There were 120 evaluable patients—59 in the romyelocel-L arm and 61 in the control arm.

The study’s primary endpoint was days in a febrile episode (DFE). The mean DFE from day 9 to 28 was 6.46 days in the romyelocel-L arm and 6.86 days in the control arm (P=0.350). The mean DFE for days 15 to 28 was 2.36 and 3.90, respectively (P=0.020).

The incidence of microbiologically or clinically diagnosed infection from day 9 to 28 was 35.6% in the romyelocel-L arm and 47.5% in the control arm, a decrease of 25% (P=0.089).

From day 15 to 28 the incidence of infection was 6.8% in the romyelocel-L arm and 27.9% in the control arm, a decrease of 76% (P=0.002).

There were no infectious deaths in the romyelocel-L arm but 2 deaths attributed to pneumonia in the control arm.

The mean hospital stay was 25.5 days in the romyelocel-L arm and 28.7 days in the control arm (P=0.002).

The proportion of patients with serious adverse events (AEs) was 14% in the romyelocel-L arm and 18% in the control arm. The proportion of patients with infectious serious AEs was 50% and 77%, respectively.

The most frequent treatment-emergent AEs (in the romyelocel-L and control arms, respectively) were febrile neutropenia (31.4% and 31%), diarrhea (25.7% and 32.4%), hypokalemia (31.4% and 25.4%), hypophosphatemia (21.4% and 23.9%), and pyrexia (22.9% and 22.5%).

There were no cases of graft-versus-host disease.  

AML cells

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended marketing authorization for CPX-351 (Vyxeos™), a liposomal formulation that delivers a fixed ratio (1:5) of daunorubicin and cytarabine.

The CHMP is recommending approval of CPX-351 (44 mg/100 mg) for the treatment of adults with newly diagnosed, therapy-related acute myeloid leukemia or AML with myelodysplasia-related changes.

The CHMP’s recommendation will be reviewed by the European Commission, which has the authority to approve medicines for use in the European Union, Norway, Iceland, and Liechtenstein.

The European Commission usually makes a decision within 67 days of the CHMP’s recommendation.

The marketing authorization application for CPX-351 is supported by data from 5 studies, including a phase 3 study.

Data from the phase 3 study were presented at the 2016 ASCO Annual Meeting and are available in the US prescribing information for CPX-351. (The following data are taken from the prescribing information.)

This trial enrolled 309 patients, ages 60 to 75, with newly diagnosed, therapy-related AML or AML with myelodysplasia-related changes.

They received CPX-351 (n=153) or cytarabine and daunorubicin (7+3; n=156).

The complete response rate was 38% in the CPX-351 arm and 26% in the 7+3 arm (P=0.036).

The rate of hematopoietic stem cell transplant was 34% in the CPX-351 arm and 25% in the 7+3 arm.

The median overall survival was 9.6 months in the CPX-351 arm and 5.9 months in the 7+3 arm (P=0.005).

All-cause 30-day mortality was 6% in the CPX-351 arm and 11% in the 7+3 arm. Sixty-day mortality was 14% and 21%, respectively.

Six percent of patients in both arms had a fatal adverse event (AE) on treatment or within 30 days of therapy that was not in the setting of progressive disease.

The rate of AEs that led to discontinuation was 18% in the CPX-351 arm and 13% in the 7+3 arm. AEs leading to discontinuation in the CPX-351 arm included prolonged cytopenias, infection, cardiotoxicity, respiratory failure, hemorrhage, renal insufficiency, colitis, and generalized medical deterioration.

The most common AEs (incidence ≥ 25%) in the CPX-351 arm were hemorrhagic events, febrile neutropenia, rash, edema, nausea, mucositis, diarrhea, constipation, musculoskeletal pain, fatigue, abdominal pain, dyspnea, headache, cough, decreased appetite, arrhythmia, pneumonia, bacteremia, chills, sleep disorders, and vomiting.

The most common serious AEs (incidence ≥ 5%) in the CPX-351 arm were dyspnea, myocardial toxicity, sepsis, pneumonia, febrile neutropenia, bacteremia, and hemorrhage.

AML cells

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended marketing authorization for CPX-351 (Vyxeos™), a liposomal formulation that delivers a fixed ratio (1:5) of daunorubicin and cytarabine.

The CHMP is recommending approval of CPX-351 (44 mg/100 mg) for the treatment of adults with newly diagnosed, therapy-related acute myeloid leukemia or AML with myelodysplasia-related changes.

The CHMP’s recommendation will be reviewed by the European Commission, which has the authority to approve medicines for use in the European Union, Norway, Iceland, and Liechtenstein.

The European Commission usually makes a decision within 67 days of the CHMP’s recommendation.

The marketing authorization application for CPX-351 is supported by data from 5 studies, including a phase 3 study.

Data from the phase 3 study were presented at the 2016 ASCO Annual Meeting and are available in the US prescribing information for CPX-351. (The following data are taken from the prescribing information.)

This trial enrolled 309 patients, ages 60 to 75, with newly diagnosed, therapy-related AML or AML with myelodysplasia-related changes.

They received CPX-351 (n=153) or cytarabine and daunorubicin (7+3; n=156).

The complete response rate was 38% in the CPX-351 arm and 26% in the 7+3 arm (P=0.036).

The rate of hematopoietic stem cell transplant was 34% in the CPX-351 arm and 25% in the 7+3 arm.

The median overall survival was 9.6 months in the CPX-351 arm and 5.9 months in the 7+3 arm (P=0.005).

All-cause 30-day mortality was 6% in the CPX-351 arm and 11% in the 7+3 arm. Sixty-day mortality was 14% and 21%, respectively.

Six percent of patients in both arms had a fatal adverse event (AE) on treatment or within 30 days of therapy that was not in the setting of progressive disease.

The rate of AEs that led to discontinuation was 18% in the CPX-351 arm and 13% in the 7+3 arm. AEs leading to discontinuation in the CPX-351 arm included prolonged cytopenias, infection, cardiotoxicity, respiratory failure, hemorrhage, renal insufficiency, colitis, and generalized medical deterioration.

The most common AEs (incidence ≥ 25%) in the CPX-351 arm were hemorrhagic events, febrile neutropenia, rash, edema, nausea, mucositis, diarrhea, constipation, musculoskeletal pain, fatigue, abdominal pain, dyspnea, headache, cough, decreased appetite, arrhythmia, pneumonia, bacteremia, chills, sleep disorders, and vomiting.

The most common serious AEs (incidence ≥ 5%) in the CPX-351 arm were dyspnea, myocardial toxicity, sepsis, pneumonia, febrile neutropenia, bacteremia, and hemorrhage.

AML cells

The European Medicines Agency’s Committee for Medicinal Products for Human Use (CHMP) has recommended marketing authorization for CPX-351 (Vyxeos™), a liposomal formulation that delivers a fixed ratio (1:5) of daunorubicin and cytarabine.

The CHMP is recommending approval of CPX-351 (44 mg/100 mg) for the treatment of adults with newly diagnosed, therapy-related acute myeloid leukemia or AML with myelodysplasia-related changes.

The CHMP’s recommendation will be reviewed by the European Commission, which has the authority to approve medicines for use in the European Union, Norway, Iceland, and Liechtenstein.

The European Commission usually makes a decision within 67 days of the CHMP’s recommendation.

The marketing authorization application for CPX-351 is supported by data from 5 studies, including a phase 3 study.

Data from the phase 3 study were presented at the 2016 ASCO Annual Meeting and are available in the US prescribing information for CPX-351. (The following data are taken from the prescribing information.)

This trial enrolled 309 patients, ages 60 to 75, with newly diagnosed, therapy-related AML or AML with myelodysplasia-related changes.

They received CPX-351 (n=153) or cytarabine and daunorubicin (7+3; n=156).

The complete response rate was 38% in the CPX-351 arm and 26% in the 7+3 arm (P=0.036).

The rate of hematopoietic stem cell transplant was 34% in the CPX-351 arm and 25% in the 7+3 arm.

The median overall survival was 9.6 months in the CPX-351 arm and 5.9 months in the 7+3 arm (P=0.005).

All-cause 30-day mortality was 6% in the CPX-351 arm and 11% in the 7+3 arm. Sixty-day mortality was 14% and 21%, respectively.

Six percent of patients in both arms had a fatal adverse event (AE) on treatment or within 30 days of therapy that was not in the setting of progressive disease.

The rate of AEs that led to discontinuation was 18% in the CPX-351 arm and 13% in the 7+3 arm. AEs leading to discontinuation in the CPX-351 arm included prolonged cytopenias, infection, cardiotoxicity, respiratory failure, hemorrhage, renal insufficiency, colitis, and generalized medical deterioration.

The most common AEs (incidence ≥ 25%) in the CPX-351 arm were hemorrhagic events, febrile neutropenia, rash, edema, nausea, mucositis, diarrhea, constipation, musculoskeletal pain, fatigue, abdominal pain, dyspnea, headache, cough, decreased appetite, arrhythmia, pneumonia, bacteremia, chills, sleep disorders, and vomiting.

The most common serious AEs (incidence ≥ 5%) in the CPX-351 arm were dyspnea, myocardial toxicity, sepsis, pneumonia, febrile neutropenia, bacteremia, and hemorrhage.

Micrograph showing MDS

The US Food and Drug Administration (FDA) has lifted the clinical hold on a phase 1b trial of APTO-253.

APTO-253 is a small molecule that inhibits expression of the c-Myc oncogene without causing general myelosuppression of the bone marrow, according to Aptose Biosciences Inc., the company developing the drug.

Aptose was testing APTO-253 in a phase 1b trial of patients with relapsed or refractory acute myeloid leukemia (AML) or high-risk myelodysplastic syndromes (MDS) before the FDA put the trial on hold in November 2015.

The hold was placed after an event that occurred during dosing at a clinical site. The event was stoppage of an intravenous infusion pump that was caused by back pressure resulting from clogging of the in-line filter.

Aptose said no drug-related serious adverse events were reported, and the observed pharmacokinetic levels in patients treated with APTO-253 were within the expected range.

However, a review revealed concerns about the documentation records of the manufacturing procedures associated with APTO-253. So Aptose  voluntarily stopped dosing in the phase 1b trial, and the FDA placed the trial on hold.

A root cause investigation revealed that the event with the infusion pump resulted from chemistry and manufacturing-based issues.

Therefore, Aptose developed a new formulation of APTO-253 that did not cause filter clogging or pump stoppage during simulated infusion studies.

Now that the FDA has lifted the hold on the phase 1b trial, Aptose said screening and dosing will resume “as soon as practicable.”

“We are eager to return APTO-253 back into the clinic,” said William G. Rice, PhD, chairman, president and chief executive officer of Aptose.

“Our understanding of this molecule has evolved dramatically, and we are excited to deliver a MYC gene expression inhibitor to patients with debilitating hematologic malignancies.”

The phase 1b trial is designed to assess the safety, tolerability, pharmacokinetics, pharmacodynamics, and efficacy of APTO-253 as a single agent and determine the recommended phase 2 dose of the drug.

APTO-253 will be administered once weekly, over a 28-day cycle. The dose-escalation cohort of the study could potentially enroll up to 20 patients with relapsed or refractory AML or high-risk MDS. The study is designed to then transition, as appropriate, to single-agent expansion cohorts in AML and MDS.

Micrograph showing MDS

The US Food and Drug Administration (FDA) has lifted the clinical hold on a phase 1b trial of APTO-253.

APTO-253 is a small molecule that inhibits expression of the c-Myc oncogene without causing general myelosuppression of the bone marrow, according to Aptose Biosciences Inc., the company developing the drug.

Aptose was testing APTO-253 in a phase 1b trial of patients with relapsed or refractory acute myeloid leukemia (AML) or high-risk myelodysplastic syndromes (MDS) before the FDA put the trial on hold in November 2015.

The hold was placed after an event that occurred during dosing at a clinical site. The event was stoppage of an intravenous infusion pump that was caused by back pressure resulting from clogging of the in-line filter.

Aptose said no drug-related serious adverse events were reported, and the observed pharmacokinetic levels in patients treated with APTO-253 were within the expected range.

However, a review revealed concerns about the documentation records of the manufacturing procedures associated with APTO-253. So Aptose  voluntarily stopped dosing in the phase 1b trial, and the FDA placed the trial on hold.

A root cause investigation revealed that the event with the infusion pump resulted from chemistry and manufacturing-based issues.

Therefore, Aptose developed a new formulation of APTO-253 that did not cause filter clogging or pump stoppage during simulated infusion studies.

Now that the FDA has lifted the hold on the phase 1b trial, Aptose said screening and dosing will resume “as soon as practicable.”

“We are eager to return APTO-253 back into the clinic,” said William G. Rice, PhD, chairman, president and chief executive officer of Aptose.

“Our understanding of this molecule has evolved dramatically, and we are excited to deliver a MYC gene expression inhibitor to patients with debilitating hematologic malignancies.”

The phase 1b trial is designed to assess the safety, tolerability, pharmacokinetics, pharmacodynamics, and efficacy of APTO-253 as a single agent and determine the recommended phase 2 dose of the drug.

APTO-253 will be administered once weekly, over a 28-day cycle. The dose-escalation cohort of the study could potentially enroll up to 20 patients with relapsed or refractory AML or high-risk MDS. The study is designed to then transition, as appropriate, to single-agent expansion cohorts in AML and MDS.

Micrograph showing MDS

The US Food and Drug Administration (FDA) has lifted the clinical hold on a phase 1b trial of APTO-253.

APTO-253 is a small molecule that inhibits expression of the c-Myc oncogene without causing general myelosuppression of the bone marrow, according to Aptose Biosciences Inc., the company developing the drug.

Aptose was testing APTO-253 in a phase 1b trial of patients with relapsed or refractory acute myeloid leukemia (AML) or high-risk myelodysplastic syndromes (MDS) before the FDA put the trial on hold in November 2015.

The hold was placed after an event that occurred during dosing at a clinical site. The event was stoppage of an intravenous infusion pump that was caused by back pressure resulting from clogging of the in-line filter.

Aptose said no drug-related serious adverse events were reported, and the observed pharmacokinetic levels in patients treated with APTO-253 were within the expected range.

However, a review revealed concerns about the documentation records of the manufacturing procedures associated with APTO-253. So Aptose  voluntarily stopped dosing in the phase 1b trial, and the FDA placed the trial on hold.

A root cause investigation revealed that the event with the infusion pump resulted from chemistry and manufacturing-based issues.

Therefore, Aptose developed a new formulation of APTO-253 that did not cause filter clogging or pump stoppage during simulated infusion studies.

Now that the FDA has lifted the hold on the phase 1b trial, Aptose said screening and dosing will resume “as soon as practicable.”

“We are eager to return APTO-253 back into the clinic,” said William G. Rice, PhD, chairman, president and chief executive officer of Aptose.

“Our understanding of this molecule has evolved dramatically, and we are excited to deliver a MYC gene expression inhibitor to patients with debilitating hematologic malignancies.”

The phase 1b trial is designed to assess the safety, tolerability, pharmacokinetics, pharmacodynamics, and efficacy of APTO-253 as a single agent and determine the recommended phase 2 dose of the drug.

APTO-253 will be administered once weekly, over a 28-day cycle. The dose-escalation cohort of the study could potentially enroll up to 20 patients with relapsed or refractory AML or high-risk MDS. The study is designed to then transition, as appropriate, to single-agent expansion cohorts in AML and MDS.

Image by Lance Liotta

The US Food and Drug Administration (FDA) has accepted for priority review a new drug application (NDA) for glasdegib, an oral SMO inhibitor.

With this NDA, Pfizer is seeking approval for glasdegib in combination with low-dose cytarabine (LDAC) as a treatment for adults with previously untreated acute myeloid leukemia (AML).

The FDA grants priority review to applications for products that may provide significant improvements in the treatment, diagnosis, or prevention of serious conditions.

The agency intends to take action on a priority review application within 6 months of receiving it rather than the standard 10 months.

The FDA expects to make a decision on the NDA for glasdegib by December 2018.

The NDA is supported by results from the phase 2 BRIGHT 1003 study. Results from this trial were presented at the 2016 ASH Annual Meeting.

The trial was a comparison of glasdegib plus LDAC (n=88) to LDAC alone (n=44) in patients with previously untreated AML or high-risk myelodysplastic syndromes who were not eligible for intensive chemotherapy.

Results demonstrated a significant improvement in overall survival with glasdegib. The median overall survival was 8.8 months in the glasdegib arm and 4.9 months in the LDAC-alone arm.

This difference represented a 49.9% reduction in the risk of death for patients treated with glasdegib plus LDAC (hazard ratio=0.501; 95% CI: 0.334, 0.752; one-sided P-value=0.0003).

The most frequent adverse events—occurring in at least 30% of patients in the glasdegib arm and LDAC-alone arm, respectively—were anemia (45% vs 42%), febrile neutropenia (36% vs 27%), nausea (36% vs 12%), decreased appetite (32% vs 12%), fatigue (31% vs 20%), and thrombocytopenia (30% vs 27%).

The most frequently reported serious adverse events—occurring in at least 15%  of patients in the glasdegib and LDAC-alone arms, respectively—were febrile neutropenia (29% vs 20%) and pneumonia (21% vs 17%).

A phase 3 trial of glasdegib in AML began enrolling earlier this year. In this trial (BRIGHT AML 1019; NCT03416179), researchers are evaluating glasdegib plus intensive or non-intensive chemotherapy in patients with newly diagnosed AML.

Image by Lance Liotta

The US Food and Drug Administration (FDA) has accepted for priority review a new drug application (NDA) for glasdegib, an oral SMO inhibitor.

With this NDA, Pfizer is seeking approval for glasdegib in combination with low-dose cytarabine (LDAC) as a treatment for adults with previously untreated acute myeloid leukemia (AML).

The FDA grants priority review to applications for products that may provide significant improvements in the treatment, diagnosis, or prevention of serious conditions.

The agency intends to take action on a priority review application within 6 months of receiving it rather than the standard 10 months.

The FDA expects to make a decision on the NDA for glasdegib by December 2018.

The NDA is supported by results from the phase 2 BRIGHT 1003 study. Results from this trial were presented at the 2016 ASH Annual Meeting.

The trial was a comparison of glasdegib plus LDAC (n=88) to LDAC alone (n=44) in patients with previously untreated AML or high-risk myelodysplastic syndromes who were not eligible for intensive chemotherapy.

Results demonstrated a significant improvement in overall survival with glasdegib. The median overall survival was 8.8 months in the glasdegib arm and 4.9 months in the LDAC-alone arm.

This difference represented a 49.9% reduction in the risk of death for patients treated with glasdegib plus LDAC (hazard ratio=0.501; 95% CI: 0.334, 0.752; one-sided P-value=0.0003).

The most frequent adverse events—occurring in at least 30% of patients in the glasdegib arm and LDAC-alone arm, respectively—were anemia (45% vs 42%), febrile neutropenia (36% vs 27%), nausea (36% vs 12%), decreased appetite (32% vs 12%), fatigue (31% vs 20%), and thrombocytopenia (30% vs 27%).

The most frequently reported serious adverse events—occurring in at least 15%  of patients in the glasdegib and LDAC-alone arms, respectively—were febrile neutropenia (29% vs 20%) and pneumonia (21% vs 17%).

A phase 3 trial of glasdegib in AML began enrolling earlier this year. In this trial (BRIGHT AML 1019; NCT03416179), researchers are evaluating glasdegib plus intensive or non-intensive chemotherapy in patients with newly diagnosed AML.

Image by Lance Liotta

The US Food and Drug Administration (FDA) has accepted for priority review a new drug application (NDA) for glasdegib, an oral SMO inhibitor.

With this NDA, Pfizer is seeking approval for glasdegib in combination with low-dose cytarabine (LDAC) as a treatment for adults with previously untreated acute myeloid leukemia (AML).

The FDA grants priority review to applications for products that may provide significant improvements in the treatment, diagnosis, or prevention of serious conditions.

The agency intends to take action on a priority review application within 6 months of receiving it rather than the standard 10 months.

The FDA expects to make a decision on the NDA for glasdegib by December 2018.

The NDA is supported by results from the phase 2 BRIGHT 1003 study. Results from this trial were presented at the 2016 ASH Annual Meeting.

The trial was a comparison of glasdegib plus LDAC (n=88) to LDAC alone (n=44) in patients with previously untreated AML or high-risk myelodysplastic syndromes who were not eligible for intensive chemotherapy.

Results demonstrated a significant improvement in overall survival with glasdegib. The median overall survival was 8.8 months in the glasdegib arm and 4.9 months in the LDAC-alone arm.

This difference represented a 49.9% reduction in the risk of death for patients treated with glasdegib plus LDAC (hazard ratio=0.501; 95% CI: 0.334, 0.752; one-sided P-value=0.0003).

The most frequent adverse events—occurring in at least 30% of patients in the glasdegib arm and LDAC-alone arm, respectively—were anemia (45% vs 42%), febrile neutropenia (36% vs 27%), nausea (36% vs 12%), decreased appetite (32% vs 12%), fatigue (31% vs 20%), and thrombocytopenia (30% vs 27%).

The most frequently reported serious adverse events—occurring in at least 15%  of patients in the glasdegib and LDAC-alone arms, respectively—were febrile neutropenia (29% vs 20%) and pneumonia (21% vs 17%).

A phase 3 trial of glasdegib in AML began enrolling earlier this year. In this trial (BRIGHT AML 1019; NCT03416179), researchers are evaluating glasdegib plus intensive or non-intensive chemotherapy in patients with newly diagnosed AML.

There is growing literature around clonal hematopoiesis (CH) but many questions persist about its clinical significance. On June 14, Hematology News hosted a Twitter question-and-answer session with Aaron Viny, MD, who is on the staff of the leukemia service at Memorial Sloan Kettering Cancer Center in New York and is a member of the Hematology News editorial advisory board, to answer questions about CH and interpret the latest research. The following is an edited version of the Q&A session.

Question: Can you get us started by explaining the difference between clonal hematopoiesis (CH) and clonal cytopenia of undetermined significance?

Question: So are there differences in CH depending on the gene mutated?

Dr. Viny: Hard to say. The most common mutations found in CH are DNMT3A, TET2, PPM1D, and ASXL1, as shown in the Cell Stem Cell paper by Catherine C. Coombs, MD, and Ross Levine, MD (2017 Sep 7;21[3]:374-82.e4). So in the setting of patients with acute myeloid leukemia, there are data from several groups showing that persistence of DNMT3A, TET2, and ASXL1 have less recurrence risk, compared with the field. This, of course, does not apply to CH in the absence of a hematologic disorder.

Question: Are you aware of any screening programs for clonal hematopoiesis?

Dr. Viny: Currently at Memorial Sloan Kettering, patients who undergo MSK-IMPACT testing of their solid tumor have a germ line control from blood that is also sequenced. These samples are screened for CH mutations. In fact, there are two recent papers showing one key issue with tumor sequencing and CH: A blood sample is necessary to resolve the compartment of the CH mutation (that is, not in the solid tumor). The papers are JAMA Oncol. 2018 Jun 5. doi: 10.1001/jamaoncol.2018.2297 and Clin Cancer Res. 2018 Jun 4. doi: 10.1158/1078-0432.CCR-18-1201.

Question: Will patients with CH in screened samples be notified of the results?

Dr. Viny: Yes. The patients are being referred to the Memorial Sloan Kettering clonal hematopoiesis clinic run by Dr. Levine and Kelly Bolton, MD.

Question: Once you screen and detect CH, how should these patients be followed?

Dr. Viny: First, what are the risks these patients face? Extensive work by Siddhartha Jaiswal, MD, PhD, shows that there is an increased risk of cardiovascular disease and an increased risk for leukemia. So with regards to the latter, following with serial complete blood counts seems sufficient, with a bone marrow biopsy at the detection of any cytopenias. With regard to cardiovascular risk, I consider CH akin to an unmodifiable cardiac risk factor. Patients should be counseled to exercise, and depending on any other cardiac risk factors, interventions such as blood pressure control, lipid control, and daily aspirin use should be addressed accordingly.

Question: Is this BRCA1 all over again?

Dr. Viny: Perhaps. With BRCA1, we now have a few decades of follow-up to better understand the risks and even intervene with preventive interventions. Clonal hematopoiesis needs the follow-up and research to support clinical action.

Question: Could you please refer your readers to your favorite review on clonal hematopoiesis?

Dr. Viny: An outstanding review of the mechanisms and molecular consequences of clonal hematopoiesis is in Cell Stem Cell (2018 Feb 1;22[2]:157-70).

Question: Are there any effects of previous radiation on the development of CH?

Dr. Viny: Let’s start by saying that CH in the absence of prior cancer is probably a different entity. Radiation, tobacco use, and increased age all increase the risk for detection of a CH somatic mutation.

Question: What are the clinical implications of CH?

Dr. Viny: While I think it is still too soon to say if these are the only clinical implications, both increased risk of hematologic malignancy and increased risk of cardiovascular disease are the best studied and described to date. Here’s an excellent article on the cardiovascular risk: N Engl J Med. 2017 Jul 13;377(2):111-21. Of interest, it seems that the increased risk, while being relatively low, does not plateau over time.

Question: What do you think about TET2 mutations being among the most frequent mutations in CH, but IDH being relatively rare?

Dr. Viny: Great question. Both are affecting demethylation and epigenetic instability. While I don’t think the answer is known, perhaps the IDH mutations have a more dominant effect on hematopoietic output. The majority of the CH data uses blood; maybe the marrow tells a different story.

Question: Can we cure clonal hematopoiesis with vitamin C?

Dr. Viny: You clearly know the recent work by Iannis Aifantis, PhD, showing the effects of vitamin C on TET enzyme activity, published here: Cell. 2017 Sep 7;170(6):1079-95. For CH patients with TET2 mutations, a high-dose vitamin C regimen sounds very exciting. There is also complementary work by Sean Morrison, PhD, published in Nature (2017 Sep 28;549[7673]:476-81).

Question: Is there a limit to the sequencing depth and variant allele fraction needed to identify clonal hematopoiesis? At what point is CH not CH?

Dr. Viny: So this is as much a technical question as it is a biological question. As of now we can reliably detect variant allele fraction in CH to 0.1%, at best. What is detectable and what is clinically relevant are questions that still need to be answered.

Question: There seems to be a lot of good research going on in CH. What are the big knowledge gaps that future studies should be targeting?

Dr. Viny: First, what are the functional and molecular consequences of the varying alleles in CH? Second, are there other clinical risks to CH beyond leukemia and cardiovascular disease? And third, does inflammation cause CH or does CH cause inflammation?

Dr. Viny is with the Memorial Sloan Kettering Cancer Center, New York, where he is a clinical instructor; is on the staff of the leukemia service; and is a clinical researcher in the Ross Levine Lab. Connect with him on Twitter at @TheDoctorIsVin.

There is growing literature around clonal hematopoiesis (CH) but many questions persist about its clinical significance. On June 14, Hematology News hosted a Twitter question-and-answer session with Aaron Viny, MD, who is on the staff of the leukemia service at Memorial Sloan Kettering Cancer Center in New York and is a member of the Hematology News editorial advisory board, to answer questions about CH and interpret the latest research. The following is an edited version of the Q&A session.

Question: Can you get us started by explaining the difference between clonal hematopoiesis (CH) and clonal cytopenia of undetermined significance?

Question: So are there differences in CH depending on the gene mutated?

Dr. Viny: Hard to say. The most common mutations found in CH are DNMT3A, TET2, PPM1D, and ASXL1, as shown in the Cell Stem Cell paper by Catherine C. Coombs, MD, and Ross Levine, MD (2017 Sep 7;21[3]:374-82.e4). So in the setting of patients with acute myeloid leukemia, there are data from several groups showing that persistence of DNMT3A, TET2, and ASXL1 have less recurrence risk, compared with the field. This, of course, does not apply to CH in the absence of a hematologic disorder.

Question: Are you aware of any screening programs for clonal hematopoiesis?

Dr. Viny: Currently at Memorial Sloan Kettering, patients who undergo MSK-IMPACT testing of their solid tumor have a germ line control from blood that is also sequenced. These samples are screened for CH mutations. In fact, there are two recent papers showing one key issue with tumor sequencing and CH: A blood sample is necessary to resolve the compartment of the CH mutation (that is, not in the solid tumor). The papers are JAMA Oncol. 2018 Jun 5. doi: 10.1001/jamaoncol.2018.2297 and Clin Cancer Res. 2018 Jun 4. doi: 10.1158/1078-0432.CCR-18-1201.

Question: Will patients with CH in screened samples be notified of the results?

Dr. Viny: Yes. The patients are being referred to the Memorial Sloan Kettering clonal hematopoiesis clinic run by Dr. Levine and Kelly Bolton, MD.

Question: Once you screen and detect CH, how should these patients be followed?

Dr. Viny: First, what are the risks these patients face? Extensive work by Siddhartha Jaiswal, MD, PhD, shows that there is an increased risk of cardiovascular disease and an increased risk for leukemia. So with regards to the latter, following with serial complete blood counts seems sufficient, with a bone marrow biopsy at the detection of any cytopenias. With regard to cardiovascular risk, I consider CH akin to an unmodifiable cardiac risk factor. Patients should be counseled to exercise, and depending on any other cardiac risk factors, interventions such as blood pressure control, lipid control, and daily aspirin use should be addressed accordingly.

Question: Is this BRCA1 all over again?

Dr. Viny: Perhaps. With BRCA1, we now have a few decades of follow-up to better understand the risks and even intervene with preventive interventions. Clonal hematopoiesis needs the follow-up and research to support clinical action.

Question: Could you please refer your readers to your favorite review on clonal hematopoiesis?

Dr. Viny: An outstanding review of the mechanisms and molecular consequences of clonal hematopoiesis is in Cell Stem Cell (2018 Feb 1;22[2]:157-70).

Question: Are there any effects of previous radiation on the development of CH?

Dr. Viny: Let’s start by saying that CH in the absence of prior cancer is probably a different entity. Radiation, tobacco use, and increased age all increase the risk for detection of a CH somatic mutation.

Question: What are the clinical implications of CH?

Dr. Viny: While I think it is still too soon to say if these are the only clinical implications, both increased risk of hematologic malignancy and increased risk of cardiovascular disease are the best studied and described to date. Here’s an excellent article on the cardiovascular risk: N Engl J Med. 2017 Jul 13;377(2):111-21. Of interest, it seems that the increased risk, while being relatively low, does not plateau over time.

Question: What do you think about TET2 mutations being among the most frequent mutations in CH, but IDH being relatively rare?

Dr. Viny: Great question. Both are affecting demethylation and epigenetic instability. While I don’t think the answer is known, perhaps the IDH mutations have a more dominant effect on hematopoietic output. The majority of the CH data uses blood; maybe the marrow tells a different story.

Question: Can we cure clonal hematopoiesis with vitamin C?

Dr. Viny: You clearly know the recent work by Iannis Aifantis, PhD, showing the effects of vitamin C on TET enzyme activity, published here: Cell. 2017 Sep 7;170(6):1079-95. For CH patients with TET2 mutations, a high-dose vitamin C regimen sounds very exciting. There is also complementary work by Sean Morrison, PhD, published in Nature (2017 Sep 28;549[7673]:476-81).

Question: Is there a limit to the sequencing depth and variant allele fraction needed to identify clonal hematopoiesis? At what point is CH not CH?

Dr. Viny: So this is as much a technical question as it is a biological question. As of now we can reliably detect variant allele fraction in CH to 0.1%, at best. What is detectable and what is clinically relevant are questions that still need to be answered.

Question: There seems to be a lot of good research going on in CH. What are the big knowledge gaps that future studies should be targeting?

Dr. Viny: First, what are the functional and molecular consequences of the varying alleles in CH? Second, are there other clinical risks to CH beyond leukemia and cardiovascular disease? And third, does inflammation cause CH or does CH cause inflammation?

Dr. Viny is with the Memorial Sloan Kettering Cancer Center, New York, where he is a clinical instructor; is on the staff of the leukemia service; and is a clinical researcher in the Ross Levine Lab. Connect with him on Twitter at @TheDoctorIsVin.

There is growing literature around clonal hematopoiesis (CH) but many questions persist about its clinical significance. On June 14, Hematology News hosted a Twitter question-and-answer session with Aaron Viny, MD, who is on the staff of the leukemia service at Memorial Sloan Kettering Cancer Center in New York and is a member of the Hematology News editorial advisory board, to answer questions about CH and interpret the latest research. The following is an edited version of the Q&A session.

Question: Can you get us started by explaining the difference between clonal hematopoiesis (CH) and clonal cytopenia of undetermined significance?

Question: So are there differences in CH depending on the gene mutated?

Dr. Viny: Hard to say. The most common mutations found in CH are DNMT3A, TET2, PPM1D, and ASXL1, as shown in the Cell Stem Cell paper by Catherine C. Coombs, MD, and Ross Levine, MD (2017 Sep 7;21[3]:374-82.e4). So in the setting of patients with acute myeloid leukemia, there are data from several groups showing that persistence of DNMT3A, TET2, and ASXL1 have less recurrence risk, compared with the field. This, of course, does not apply to CH in the absence of a hematologic disorder.

Question: Are you aware of any screening programs for clonal hematopoiesis?

Dr. Viny: Currently at Memorial Sloan Kettering, patients who undergo MSK-IMPACT testing of their solid tumor have a germ line control from blood that is also sequenced. These samples are screened for CH mutations. In fact, there are two recent papers showing one key issue with tumor sequencing and CH: A blood sample is necessary to resolve the compartment of the CH mutation (that is, not in the solid tumor). The papers are JAMA Oncol. 2018 Jun 5. doi: 10.1001/jamaoncol.2018.2297 and Clin Cancer Res. 2018 Jun 4. doi: 10.1158/1078-0432.CCR-18-1201.

Question: Will patients with CH in screened samples be notified of the results?

Dr. Viny: Yes. The patients are being referred to the Memorial Sloan Kettering clonal hematopoiesis clinic run by Dr. Levine and Kelly Bolton, MD.

Question: Once you screen and detect CH, how should these patients be followed?

Dr. Viny: First, what are the risks these patients face? Extensive work by Siddhartha Jaiswal, MD, PhD, shows that there is an increased risk of cardiovascular disease and an increased risk for leukemia. So with regards to the latter, following with serial complete blood counts seems sufficient, with a bone marrow biopsy at the detection of any cytopenias. With regard to cardiovascular risk, I consider CH akin to an unmodifiable cardiac risk factor. Patients should be counseled to exercise, and depending on any other cardiac risk factors, interventions such as blood pressure control, lipid control, and daily aspirin use should be addressed accordingly.

Question: Is this BRCA1 all over again?

Dr. Viny: Perhaps. With BRCA1, we now have a few decades of follow-up to better understand the risks and even intervene with preventive interventions. Clonal hematopoiesis needs the follow-up and research to support clinical action.

Question: Could you please refer your readers to your favorite review on clonal hematopoiesis?

Dr. Viny: An outstanding review of the mechanisms and molecular consequences of clonal hematopoiesis is in Cell Stem Cell (2018 Feb 1;22[2]:157-70).

Question: Are there any effects of previous radiation on the development of CH?

Dr. Viny: Let’s start by saying that CH in the absence of prior cancer is probably a different entity. Radiation, tobacco use, and increased age all increase the risk for detection of a CH somatic mutation.

Question: What are the clinical implications of CH?

Dr. Viny: While I think it is still too soon to say if these are the only clinical implications, both increased risk of hematologic malignancy and increased risk of cardiovascular disease are the best studied and described to date. Here’s an excellent article on the cardiovascular risk: N Engl J Med. 2017 Jul 13;377(2):111-21. Of interest, it seems that the increased risk, while being relatively low, does not plateau over time.

Question: What do you think about TET2 mutations being among the most frequent mutations in CH, but IDH being relatively rare?

Dr. Viny: Great question. Both are affecting demethylation and epigenetic instability. While I don’t think the answer is known, perhaps the IDH mutations have a more dominant effect on hematopoietic output. The majority of the CH data uses blood; maybe the marrow tells a different story.

Question: Can we cure clonal hematopoiesis with vitamin C?

Dr. Viny: You clearly know the recent work by Iannis Aifantis, PhD, showing the effects of vitamin C on TET enzyme activity, published here: Cell. 2017 Sep 7;170(6):1079-95. For CH patients with TET2 mutations, a high-dose vitamin C regimen sounds very exciting. There is also complementary work by Sean Morrison, PhD, published in Nature (2017 Sep 28;549[7673]:476-81).

Question: Is there a limit to the sequencing depth and variant allele fraction needed to identify clonal hematopoiesis? At what point is CH not CH?

Dr. Viny: So this is as much a technical question as it is a biological question. As of now we can reliably detect variant allele fraction in CH to 0.1%, at best. What is detectable and what is clinically relevant are questions that still need to be answered.

Question: There seems to be a lot of good research going on in CH. What are the big knowledge gaps that future studies should be targeting?

Dr. Viny: First, what are the functional and molecular consequences of the varying alleles in CH? Second, are there other clinical risks to CH beyond leukemia and cardiovascular disease? And third, does inflammation cause CH or does CH cause inflammation?

Dr. Viny is with the Memorial Sloan Kettering Cancer Center, New York, where he is a clinical instructor; is on the staff of the leukemia service; and is a clinical researcher in the Ross Levine Lab. Connect with him on Twitter at @TheDoctorIsVin.

STOCKHOLM – A novel compound chimeric antigen receptor (cCAR) T-cell construct directed against two different targets may one day serve as a standalone therapy, as a supplement to chemotherapy, or as a bridge to transplant for patients with refractory acute myeloid leukemia (AML), investigators asserted.

To date, however, only one patient – a man with treatment-refractory AML – has been treated with the cCAR T, which contains two independent complete units, one directed against CD33 to target bulky disease and the other targeted against CLL1 on leukemic stem cells.

Neil Osterweil/MDedge News

SOURCE: Liu F et al. EHA Congress, Abstract S149.

STOCKHOLM – A novel compound chimeric antigen receptor (cCAR) T-cell construct directed against two different targets may one day serve as a standalone therapy, as a supplement to chemotherapy, or as a bridge to transplant for patients with refractory acute myeloid leukemia (AML), investigators asserted.

To date, however, only one patient – a man with treatment-refractory AML – has been treated with the cCAR T, which contains two independent complete units, one directed against CD33 to target bulky disease and the other targeted against CLL1 on leukemic stem cells.

Neil Osterweil/MDedge News

SOURCE: Liu F et al. EHA Congress, Abstract S149.

STOCKHOLM – A novel compound chimeric antigen receptor (cCAR) T-cell construct directed against two different targets may one day serve as a standalone therapy, as a supplement to chemotherapy, or as a bridge to transplant for patients with refractory acute myeloid leukemia (AML), investigators asserted.

To date, however, only one patient – a man with treatment-refractory AML – has been treated with the cCAR T, which contains two independent complete units, one directed against CD33 to target bulky disease and the other targeted against CLL1 on leukemic stem cells.

Neil Osterweil/MDedge News

SOURCE: Liu F et al. EHA Congress, Abstract S149.

The 23rd Congress of the European Hematology Association

STOCKHOLM—Phase 3 results suggest the FLT3 inhibitor quizartinib can prolong overall survival (OS) in patients with relapsed/refractory, FLT3-ITD acute myeloid leukemia (AML).

In the QuANTUM-R study, patients who received single-agent quizartinib had a significantly longer median OS than patients who received salvage chemotherapy.

There was a trend toward improved event-free survival (EFS) with quizartinib as well.

“QuANTUM-R represents the first study that shows a significant improvement in overall survival for a single agent—a FLT3 inhibitor or any other targeted agent—in this population of FLT3-mutated AML patients with refractory or relapsed disease . . .,” said study investigator Jorge Cortes, MD, of MD Anderson Cancer Center in Houston, Texas.

Dr Cortes presented results from QuANTUM-R at the 23rd Congress of the European Hematology Association (EHA). The research was selected as the best late-breaking abstract (LB2600).

The study was funded by Daiichi Sankyo, Inc., and Dr Cortes is a consultant for the company.

Patients and treatment

QuANTUM-R enrolled adults with FLT3-ITD AML (at least 3% FLT3-ITD allelic ratio) who had refractory disease or had relapsed within 6 months of their first complete remission. They had received at least 1 cycle of an induction regimen containing standard-dose anthracycline or mitoxantrone.

Patients were randomized to receive once-daily treatment with quizartinib (n=245) or a salvage chemotherapy regimen (n=122)—low-dose cytarabine (LoDAC, n=29); combination mitoxantrone, etoposide, and cytarabine (MEC, n=40); or combination fludarabine, cytarabine, and idarubicin (FLAG-IDA, n=53).

Responders could proceed to hematopoietic stem cell transplant (HSCT), and those in the quizartinib arm could resume quizartinib after HSCT.

Baseline characteristics were similar between the treatment arms. The median age was 55 (range, 19-81) for patients receiving quizartinib and 58 (range, 18-78) for those receiving chemotherapy.

Thirty-three percent of the quizartinib arm had refractory disease, and 67% had relapsed disease. Thirty-four percent of the chemotherapy arm had refractory disease, and 66% had relapsed disease.

The percentage of patients with a prior allogeneic HSCT was 25% in the quizartinib arm and 23% in the chemotherapy arm. Most patients in both arms had intermediate-risk cytogenetics—78% of the quizartinib arm and 66% of the chemotherapy arm.

In all, 241 patients received quizartinib, and 94 received salvage chemotherapy—LoDAC (n=22), MEC (n=25), and FLAG-IDA (n=47). Of the 28 patients in the chemotherapy group who were not treated, most withdrew consent.

The median treatment duration was 4 cycles (range, 1-3) in the quizartinib arm and 1 cycle (range, 1-2) for patients who received LoDAC, MEC, and FLAG-IDA.

The most common reason for discontinuation of chemotherapy was lack of response/progression (n=49), followed by death (n=6). Twenty-four patients completed salvage chemotherapy.

In the quizarinib arm, the most common reasons for treatment discontinuation were HSCT (n=79), relapse (n=60), or lack of response/progression (n=47).

Thirty-two percent of quizartinib-treated patients and 12% of the chemotherapy group went on to HSCT.

Results

The median follow-up was 23.5 months. The efficacy results include all randomized patients, and the safety results include only those who received their assigned treatment.

The study’s primary endpoint was OS. The median OS was 6.2 months in the quizartinib arm and 4.7 months in the chemotherapy arm (hazard ratio=0.76, P=0.0177). The 1-year OS rate was 27% and 20%, respectively.

The median EFS was 6.0 weeks in the quizartinib arm and 3.7 weeks in the chemotherapy arm (hazard ratio=0.90, P=0.1071). Dr Cortes noted that patients who did not receive treatment were censored on day 1, and partial responses were counted as failures in the EFS analysis.

The overall response rate was 69% in the quizartinib arm and 30% in the chemotherapy arm.

The composite complete response (CR) rate was 48% in the quizartinib arm and 27% in the chemotherapy arm. This includes the CR rate (4% and 1%, respectively), the rate of CR with incomplete platelet recovery (4% and 0%, respectively), and the rate of CR with incomplete hematologic recovery (40% and 26%, respectively). The rate of partial response was 21% and 3%, respectively.

Dr Cortes said rates of treatment-emergent adverse events (TEAEs) were similar between the treatment arms.

Grade 3 or higher hematologic TEAEs occurring in at least 5% of patients (in the quizartinib and chemotherapy groups, respectively) included thrombocytopenia (35% and 34%), anemia (30% and 29%), neutropenia (32% and 25%), febrile neutropenia (31% and 21%), and leukopenia (17% and 16%).

Grade 3 or higher nonhematologic TEAEs occurring in at least 5% of patients (in the quizartinib and chemotherapy groups, respectively) included fatigue (8% and 1%), hypokalemia (12% and 9%), sepsis/septic shock (16% and 18%), dyspnea (5% for both), hypophosphatemia (5% for both), and pneumonia (12% and 9%).

Three percent of patients in the quizartinib arm had grade 3 QTcF prolongation, but there were no grade 4 cases. Two patients discontinued quizartinib due to QTcF prolongation.

“The safety of this drug has remained constant across over 1600 patients that have been treated with quizartinib across a variety of studies,” Dr Cortes said.

He added that QuANTUM-R results open up the possibility that quizartinib could be used in other settings. Researchers are already testing standard chemotherapy with and without quizartinib in a phase 3 trial of patients with newly diagnosed, FLT-ITD AML (QuANTUM-First).

The 23rd Congress of the European Hematology Association

STOCKHOLM—Phase 3 results suggest the FLT3 inhibitor quizartinib can prolong overall survival (OS) in patients with relapsed/refractory, FLT3-ITD acute myeloid leukemia (AML).

In the QuANTUM-R study, patients who received single-agent quizartinib had a significantly longer median OS than patients who received salvage chemotherapy.

There was a trend toward improved event-free survival (EFS) with quizartinib as well.

“QuANTUM-R represents the first study that shows a significant improvement in overall survival for a single agent—a FLT3 inhibitor or any other targeted agent—in this population of FLT3-mutated AML patients with refractory or relapsed disease . . .,” said study investigator Jorge Cortes, MD, of MD Anderson Cancer Center in Houston, Texas.

Dr Cortes presented results from QuANTUM-R at the 23rd Congress of the European Hematology Association (EHA). The research was selected as the best late-breaking abstract (LB2600).

The study was funded by Daiichi Sankyo, Inc., and Dr Cortes is a consultant for the company.

Patients and treatment

QuANTUM-R enrolled adults with FLT3-ITD AML (at least 3% FLT3-ITD allelic ratio) who had refractory disease or had relapsed within 6 months of their first complete remission. They had received at least 1 cycle of an induction regimen containing standard-dose anthracycline or mitoxantrone.

Patients were randomized to receive once-daily treatment with quizartinib (n=245) or a salvage chemotherapy regimen (n=122)—low-dose cytarabine (LoDAC, n=29); combination mitoxantrone, etoposide, and cytarabine (MEC, n=40); or combination fludarabine, cytarabine, and idarubicin (FLAG-IDA, n=53).

Responders could proceed to hematopoietic stem cell transplant (HSCT), and those in the quizartinib arm could resume quizartinib after HSCT.

Baseline characteristics were similar between the treatment arms. The median age was 55 (range, 19-81) for patients receiving quizartinib and 58 (range, 18-78) for those receiving chemotherapy.

Thirty-three percent of the quizartinib arm had refractory disease, and 67% had relapsed disease. Thirty-four percent of the chemotherapy arm had refractory disease, and 66% had relapsed disease.

The percentage of patients with a prior allogeneic HSCT was 25% in the quizartinib arm and 23% in the chemotherapy arm. Most patients in both arms had intermediate-risk cytogenetics—78% of the quizartinib arm and 66% of the chemotherapy arm.

In all, 241 patients received quizartinib, and 94 received salvage chemotherapy—LoDAC (n=22), MEC (n=25), and FLAG-IDA (n=47). Of the 28 patients in the chemotherapy group who were not treated, most withdrew consent.

The median treatment duration was 4 cycles (range, 1-3) in the quizartinib arm and 1 cycle (range, 1-2) for patients who received LoDAC, MEC, and FLAG-IDA.

The most common reason for discontinuation of chemotherapy was lack of response/progression (n=49), followed by death (n=6). Twenty-four patients completed salvage chemotherapy.

In the quizarinib arm, the most common reasons for treatment discontinuation were HSCT (n=79), relapse (n=60), or lack of response/progression (n=47).

Thirty-two percent of quizartinib-treated patients and 12% of the chemotherapy group went on to HSCT.

Results

The median follow-up was 23.5 months. The efficacy results include all randomized patients, and the safety results include only those who received their assigned treatment.

The study’s primary endpoint was OS. The median OS was 6.2 months in the quizartinib arm and 4.7 months in the chemotherapy arm (hazard ratio=0.76, P=0.0177). The 1-year OS rate was 27% and 20%, respectively.

The median EFS was 6.0 weeks in the quizartinib arm and 3.7 weeks in the chemotherapy arm (hazard ratio=0.90, P=0.1071). Dr Cortes noted that patients who did not receive treatment were censored on day 1, and partial responses were counted as failures in the EFS analysis.

The overall response rate was 69% in the quizartinib arm and 30% in the chemotherapy arm.

The composite complete response (CR) rate was 48% in the quizartinib arm and 27% in the chemotherapy arm. This includes the CR rate (4% and 1%, respectively), the rate of CR with incomplete platelet recovery (4% and 0%, respectively), and the rate of CR with incomplete hematologic recovery (40% and 26%, respectively). The rate of partial response was 21% and 3%, respectively.

Dr Cortes said rates of treatment-emergent adverse events (TEAEs) were similar between the treatment arms.

Grade 3 or higher hematologic TEAEs occurring in at least 5% of patients (in the quizartinib and chemotherapy groups, respectively) included thrombocytopenia (35% and 34%), anemia (30% and 29%), neutropenia (32% and 25%), febrile neutropenia (31% and 21%), and leukopenia (17% and 16%).

Grade 3 or higher nonhematologic TEAEs occurring in at least 5% of patients (in the quizartinib and chemotherapy groups, respectively) included fatigue (8% and 1%), hypokalemia (12% and 9%), sepsis/septic shock (16% and 18%), dyspnea (5% for both), hypophosphatemia (5% for both), and pneumonia (12% and 9%).

Three percent of patients in the quizartinib arm had grade 3 QTcF prolongation, but there were no grade 4 cases. Two patients discontinued quizartinib due to QTcF prolongation.

“The safety of this drug has remained constant across over 1600 patients that have been treated with quizartinib across a variety of studies,” Dr Cortes said.

He added that QuANTUM-R results open up the possibility that quizartinib could be used in other settings. Researchers are already testing standard chemotherapy with and without quizartinib in a phase 3 trial of patients with newly diagnosed, FLT-ITD AML (QuANTUM-First).

The 23rd Congress of the European Hematology Association

STOCKHOLM—Phase 3 results suggest the FLT3 inhibitor quizartinib can prolong overall survival (OS) in patients with relapsed/refractory, FLT3-ITD acute myeloid leukemia (AML).

In the QuANTUM-R study, patients who received single-agent quizartinib had a significantly longer median OS than patients who received salvage chemotherapy.

There was a trend toward improved event-free survival (EFS) with quizartinib as well.

“QuANTUM-R represents the first study that shows a significant improvement in overall survival for a single agent—a FLT3 inhibitor or any other targeted agent—in this population of FLT3-mutated AML patients with refractory or relapsed disease . . .,” said study investigator Jorge Cortes, MD, of MD Anderson Cancer Center in Houston, Texas.

Dr Cortes presented results from QuANTUM-R at the 23rd Congress of the European Hematology Association (EHA). The research was selected as the best late-breaking abstract (LB2600).

The study was funded by Daiichi Sankyo, Inc., and Dr Cortes is a consultant for the company.

Patients and treatment

QuANTUM-R enrolled adults with FLT3-ITD AML (at least 3% FLT3-ITD allelic ratio) who had refractory disease or had relapsed within 6 months of their first complete remission. They had received at least 1 cycle of an induction regimen containing standard-dose anthracycline or mitoxantrone.

Patients were randomized to receive once-daily treatment with quizartinib (n=245) or a salvage chemotherapy regimen (n=122)—low-dose cytarabine (LoDAC, n=29); combination mitoxantrone, etoposide, and cytarabine (MEC, n=40); or combination fludarabine, cytarabine, and idarubicin (FLAG-IDA, n=53).

Responders could proceed to hematopoietic stem cell transplant (HSCT), and those in the quizartinib arm could resume quizartinib after HSCT.

Baseline characteristics were similar between the treatment arms. The median age was 55 (range, 19-81) for patients receiving quizartinib and 58 (range, 18-78) for those receiving chemotherapy.

Thirty-three percent of the quizartinib arm had refractory disease, and 67% had relapsed disease. Thirty-four percent of the chemotherapy arm had refractory disease, and 66% had relapsed disease.

The percentage of patients with a prior allogeneic HSCT was 25% in the quizartinib arm and 23% in the chemotherapy arm. Most patients in both arms had intermediate-risk cytogenetics—78% of the quizartinib arm and 66% of the chemotherapy arm.

In all, 241 patients received quizartinib, and 94 received salvage chemotherapy—LoDAC (n=22), MEC (n=25), and FLAG-IDA (n=47). Of the 28 patients in the chemotherapy group who were not treated, most withdrew consent.

The median treatment duration was 4 cycles (range, 1-3) in the quizartinib arm and 1 cycle (range, 1-2) for patients who received LoDAC, MEC, and FLAG-IDA.

The most common reason for discontinuation of chemotherapy was lack of response/progression (n=49), followed by death (n=6). Twenty-four patients completed salvage chemotherapy.

In the quizarinib arm, the most common reasons for treatment discontinuation were HSCT (n=79), relapse (n=60), or lack of response/progression (n=47).

Thirty-two percent of quizartinib-treated patients and 12% of the chemotherapy group went on to HSCT.

Results

The median follow-up was 23.5 months. The efficacy results include all randomized patients, and the safety results include only those who received their assigned treatment.

The study’s primary endpoint was OS. The median OS was 6.2 months in the quizartinib arm and 4.7 months in the chemotherapy arm (hazard ratio=0.76, P=0.0177). The 1-year OS rate was 27% and 20%, respectively.

The median EFS was 6.0 weeks in the quizartinib arm and 3.7 weeks in the chemotherapy arm (hazard ratio=0.90, P=0.1071). Dr Cortes noted that patients who did not receive treatment were censored on day 1, and partial responses were counted as failures in the EFS analysis.

The overall response rate was 69% in the quizartinib arm and 30% in the chemotherapy arm.

The composite complete response (CR) rate was 48% in the quizartinib arm and 27% in the chemotherapy arm. This includes the CR rate (4% and 1%, respectively), the rate of CR with incomplete platelet recovery (4% and 0%, respectively), and the rate of CR with incomplete hematologic recovery (40% and 26%, respectively). The rate of partial response was 21% and 3%, respectively.

Dr Cortes said rates of treatment-emergent adverse events (TEAEs) were similar between the treatment arms.

Grade 3 or higher hematologic TEAEs occurring in at least 5% of patients (in the quizartinib and chemotherapy groups, respectively) included thrombocytopenia (35% and 34%), anemia (30% and 29%), neutropenia (32% and 25%), febrile neutropenia (31% and 21%), and leukopenia (17% and 16%).

Grade 3 or higher nonhematologic TEAEs occurring in at least 5% of patients (in the quizartinib and chemotherapy groups, respectively) included fatigue (8% and 1%), hypokalemia (12% and 9%), sepsis/septic shock (16% and 18%), dyspnea (5% for both), hypophosphatemia (5% for both), and pneumonia (12% and 9%).

Three percent of patients in the quizartinib arm had grade 3 QTcF prolongation, but there were no grade 4 cases. Two patients discontinued quizartinib due to QTcF prolongation.

“The safety of this drug has remained constant across over 1600 patients that have been treated with quizartinib across a variety of studies,” Dr Cortes said.

He added that QuANTUM-R results open up the possibility that quizartinib could be used in other settings. Researchers are already testing standard chemotherapy with and without quizartinib in a phase 3 trial of patients with newly diagnosed, FLT-ITD AML (QuANTUM-First).