AML

Attendees at ASH 2014

Photo courtesy of ASH

SAN FRANCISCO—Results regarding daunorubicin escalation in induction for patients with acute myeloid leukemia (AML) have varied among different studies.

And a 90 mg/m² dose has been shown to be more effective than 45. Now, results of the UK NCRI AML17 trial have added yet another dimension to the discussion—the use of 60 mg/m² compared to 90.

Alan K. Burnett, MD, of Cardiff University in the UK, presented the data as abstract 7 at the 2014 ASH Annual Meeting.

He explained that ECOG E1900 had demonstrated superior remission and overall survival for a 90-mg dose of daunorubicin compared to a 45-mg dose in adults younger than 60.

The HOVON trial showed superior remission but no difference in overall survival for the higher dose of daunorubicin in patients older than 60.

The Korean trial demonstrated superior remission and survival rates for the 90-mg dose in patients younger than 60.

And in the GOELAMS trial, investigators found no difference between a 90-mg and a 60-mg dose level.

So the UK AML Study Group undertook to clarify the issue by comparing 90 mg to 60 mg in induction.

The investigators randomized 1206 patients younger than 60 with de novo or secondary AML or high-risk myelodysplastic syndromes (MDS) to receive 90 or 60 mg of daunorubicin on days 1, 3, and 5 of their first induction course, followed by 50 mg/m² on days 1, 3, and 5 in course 2.

All patients received ara-C during courses 1 and 2. Patients had to have LVEF of 45% or greater to be included in the trial.

The median follow-up was 29 months. Patient characteristics were comparable between the 2 groups.

The median age was 53 in both groups (range, 16-72 years), and slightly more than half of patients were male. Eighty-five percent and 84% had de novo AML in the 60-mg and 90-mg arms, respectively. Ten percent in each group had secondary AML. And 5% and 6%, respectively, had high-risk MDS.

Eleven percent in the 60-mg arm had favorable cytogenetics, compared with 9% in the 90-mg arm. Eighteen percent in each arm had mutant FLT3-ITD, and 40% in each arm were poor risk.

The investigators found no significant difference in response between the two arms—84% in the 60-mg arm and 81% in the 90-mg arm.

However, they observed a trend for increased 30-day mortality in the 90-mg arm and a significant difference in the 60-day mortality rate, which was 5% in the 60-mg arm and 10% in the 90-mg arm (P=0.001).

Twenty-nine people died by day 60 in the 60-mg arm compared with 58 in the 90-mg arm.

The main reasons for 60-day mortality in the 60-mg and 90-mg dose groups, respectively, included infection (11 vs 25 deaths), hemorrhage (3 vs 5 deaths), infection plus hemorrhage (3 vs 1 death), and resistant disease (2 vs 14 deaths), among other causes.

At 24 months, overall survival between the 2 groups was comparable, at 60% in the 60-mg arm and 59% in the 90-mg arm.

The cumulative incidence of relapse at 24 months from complete response was 41% in the 60-mg arm and 37% in the 90-mg arm.

One hundred ninety-seven patients in the 60-mg arm and 169 patients in the 90-mg arm went on to receive a stem cell transplant.

When survival was censored at transplant, there was also no difference between the arms, at 60% for the 90-mg group and 61% for the 60-mg group.

The investigators conducted subgroup analyses and found no significant benefit for 90 mg/m² in any subgroup. Dr Burnett noted, however, that there could be a potential late benefit for FLT3-ITD mutated patients who receive a 90-mg dose.

FLT3 mutated patients had a non-significant survival benefit (HR 0.74 [0.47-1.17] P=0.2) with a 90-mg dose.  However, survival was significantly worse for FLT3 wild type patients receiving 90 mg (HR 1.31 [1.03-1.67] P=0.03).

Otherwise, the group found that there is no evidence to suggest that 90 mg is superior to 60 mg.

Attendees at ASH 2014

Photo courtesy of ASH

SAN FRANCISCO—Results regarding daunorubicin escalation in induction for patients with acute myeloid leukemia (AML) have varied among different studies.

And a 90 mg/m² dose has been shown to be more effective than 45. Now, results of the UK NCRI AML17 trial have added yet another dimension to the discussion—the use of 60 mg/m² compared to 90.

Alan K. Burnett, MD, of Cardiff University in the UK, presented the data as abstract 7 at the 2014 ASH Annual Meeting.

He explained that ECOG E1900 had demonstrated superior remission and overall survival for a 90-mg dose of daunorubicin compared to a 45-mg dose in adults younger than 60.

The HOVON trial showed superior remission but no difference in overall survival for the higher dose of daunorubicin in patients older than 60.

The Korean trial demonstrated superior remission and survival rates for the 90-mg dose in patients younger than 60.

And in the GOELAMS trial, investigators found no difference between a 90-mg and a 60-mg dose level.

So the UK AML Study Group undertook to clarify the issue by comparing 90 mg to 60 mg in induction.

The investigators randomized 1206 patients younger than 60 with de novo or secondary AML or high-risk myelodysplastic syndromes (MDS) to receive 90 or 60 mg of daunorubicin on days 1, 3, and 5 of their first induction course, followed by 50 mg/m² on days 1, 3, and 5 in course 2.

All patients received ara-C during courses 1 and 2. Patients had to have LVEF of 45% or greater to be included in the trial.

The median follow-up was 29 months. Patient characteristics were comparable between the 2 groups.

The median age was 53 in both groups (range, 16-72 years), and slightly more than half of patients were male. Eighty-five percent and 84% had de novo AML in the 60-mg and 90-mg arms, respectively. Ten percent in each group had secondary AML. And 5% and 6%, respectively, had high-risk MDS.

Eleven percent in the 60-mg arm had favorable cytogenetics, compared with 9% in the 90-mg arm. Eighteen percent in each arm had mutant FLT3-ITD, and 40% in each arm were poor risk.

The investigators found no significant difference in response between the two arms—84% in the 60-mg arm and 81% in the 90-mg arm.

However, they observed a trend for increased 30-day mortality in the 90-mg arm and a significant difference in the 60-day mortality rate, which was 5% in the 60-mg arm and 10% in the 90-mg arm (P=0.001).

Twenty-nine people died by day 60 in the 60-mg arm compared with 58 in the 90-mg arm.

The main reasons for 60-day mortality in the 60-mg and 90-mg dose groups, respectively, included infection (11 vs 25 deaths), hemorrhage (3 vs 5 deaths), infection plus hemorrhage (3 vs 1 death), and resistant disease (2 vs 14 deaths), among other causes.

At 24 months, overall survival between the 2 groups was comparable, at 60% in the 60-mg arm and 59% in the 90-mg arm.

The cumulative incidence of relapse at 24 months from complete response was 41% in the 60-mg arm and 37% in the 90-mg arm.

One hundred ninety-seven patients in the 60-mg arm and 169 patients in the 90-mg arm went on to receive a stem cell transplant.

When survival was censored at transplant, there was also no difference between the arms, at 60% for the 90-mg group and 61% for the 60-mg group.

The investigators conducted subgroup analyses and found no significant benefit for 90 mg/m² in any subgroup. Dr Burnett noted, however, that there could be a potential late benefit for FLT3-ITD mutated patients who receive a 90-mg dose.

FLT3 mutated patients had a non-significant survival benefit (HR 0.74 [0.47-1.17] P=0.2) with a 90-mg dose.  However, survival was significantly worse for FLT3 wild type patients receiving 90 mg (HR 1.31 [1.03-1.67] P=0.03).

Otherwise, the group found that there is no evidence to suggest that 90 mg is superior to 60 mg.

Attendees at ASH 2014

Photo courtesy of ASH

SAN FRANCISCO—Results regarding daunorubicin escalation in induction for patients with acute myeloid leukemia (AML) have varied among different studies.

And a 90 mg/m² dose has been shown to be more effective than 45. Now, results of the UK NCRI AML17 trial have added yet another dimension to the discussion—the use of 60 mg/m² compared to 90.

Alan K. Burnett, MD, of Cardiff University in the UK, presented the data as abstract 7 at the 2014 ASH Annual Meeting.

He explained that ECOG E1900 had demonstrated superior remission and overall survival for a 90-mg dose of daunorubicin compared to a 45-mg dose in adults younger than 60.

The HOVON trial showed superior remission but no difference in overall survival for the higher dose of daunorubicin in patients older than 60.

The Korean trial demonstrated superior remission and survival rates for the 90-mg dose in patients younger than 60.

And in the GOELAMS trial, investigators found no difference between a 90-mg and a 60-mg dose level.

So the UK AML Study Group undertook to clarify the issue by comparing 90 mg to 60 mg in induction.

The investigators randomized 1206 patients younger than 60 with de novo or secondary AML or high-risk myelodysplastic syndromes (MDS) to receive 90 or 60 mg of daunorubicin on days 1, 3, and 5 of their first induction course, followed by 50 mg/m² on days 1, 3, and 5 in course 2.

All patients received ara-C during courses 1 and 2. Patients had to have LVEF of 45% or greater to be included in the trial.

The median follow-up was 29 months. Patient characteristics were comparable between the 2 groups.

The median age was 53 in both groups (range, 16-72 years), and slightly more than half of patients were male. Eighty-five percent and 84% had de novo AML in the 60-mg and 90-mg arms, respectively. Ten percent in each group had secondary AML. And 5% and 6%, respectively, had high-risk MDS.

Eleven percent in the 60-mg arm had favorable cytogenetics, compared with 9% in the 90-mg arm. Eighteen percent in each arm had mutant FLT3-ITD, and 40% in each arm were poor risk.

The investigators found no significant difference in response between the two arms—84% in the 60-mg arm and 81% in the 90-mg arm.

However, they observed a trend for increased 30-day mortality in the 90-mg arm and a significant difference in the 60-day mortality rate, which was 5% in the 60-mg arm and 10% in the 90-mg arm (P=0.001).

Twenty-nine people died by day 60 in the 60-mg arm compared with 58 in the 90-mg arm.

The main reasons for 60-day mortality in the 60-mg and 90-mg dose groups, respectively, included infection (11 vs 25 deaths), hemorrhage (3 vs 5 deaths), infection plus hemorrhage (3 vs 1 death), and resistant disease (2 vs 14 deaths), among other causes.

At 24 months, overall survival between the 2 groups was comparable, at 60% in the 60-mg arm and 59% in the 90-mg arm.

The cumulative incidence of relapse at 24 months from complete response was 41% in the 60-mg arm and 37% in the 90-mg arm.

One hundred ninety-seven patients in the 60-mg arm and 169 patients in the 90-mg arm went on to receive a stem cell transplant.

When survival was censored at transplant, there was also no difference between the arms, at 60% for the 90-mg group and 61% for the 60-mg group.

The investigators conducted subgroup analyses and found no significant benefit for 90 mg/m² in any subgroup. Dr Burnett noted, however, that there could be a potential late benefit for FLT3-ITD mutated patients who receive a 90-mg dose.

FLT3 mutated patients had a non-significant survival benefit (HR 0.74 [0.47-1.17] P=0.2) with a 90-mg dose.  However, survival was significantly worse for FLT3 wild type patients receiving 90 mg (HR 1.31 [1.03-1.67] P=0.03).

Otherwise, the group found that there is no evidence to suggest that 90 mg is superior to 60 mg.

Pills

Credit: FDA

SAN FRANCISCO—A BCL2 inhibitor that previously proved active against chronic lymphocytic leukemia has shown activity in certain patients with acute myelogenous leukemia (AML) as well.

This phase 2 trial was the first use of the inhibitor, ABT-199 (or venetoclax), in patients with relapsed or refractory AML.

Five of 32 patients treated with ABT-199 achieved a complete response (CR) or CR with incomplete blood count recovery (CRi), and several more had stable disease.

The drug appeared to be particularly active in patients with IDH mutations.

Marina Konopleva, MD, PhD, of the University of Texas MD Anderson Cancer Center in Houston, presented these results at the 2014 ASH Annual Meeting (abstract 118). The research was funded by AbbVie, Inc., the company developing ABT-199.

The trial was launched on the basis of preclinical studies showing that ABT-199 could kill AML cell lines, patients’ AML cells, and patient-derived AML cells implanted in mice.

The researchers enrolled 32 AML patients, 30 of whom had relapsed or refractory disease. Patients had a median age of 71 (range, 19 to 84), and half were male.

The overall response rate was 15.5%, with 1 patient achieving a CR and 4 patients achieving a CRi. The researchers noted that 3 of the patients who had a CR/CRi had IDH mutations. Two of these patients also achieved minimal residual disease negativity.

The team said these results suggest single-agent ABT-199 can have considerable clinical activity in patients with relapsed or refractory AML, and patients with mutations in IDH genes may be particularly sensitive to the drug.

The researchers also found the median bone marrow blast count in evaluable patients decreased 36% after treatment with ABT-199. And 6 patients (19%) had at least a 50% reduction in bone marrow blasts.

Common adverse events following treatment (occurring in at least 25% of patients) included nausea, diarrhea, fatigue, neutropenia, and vomiting. Grade 3 and 4 adverse events (occurring in 3 or more patients) included febrile neutropenia, anemia, and pneumonia.

No patients died as a result of treatment-related adverse events.

Furthermore, the maximum-tolerated dose was not reached, leaving open the possibility of higher doses in further trials. The next step is to carry out trials combining ABT-199 with other agents. These trials are currently opening at several sites.

AbbVie said ABT-199 will be studied in combination with common AML treatments, and the company is developing ABT-199 for, and evaluating the drug in, several hematologic malignancies.

Pills

Credit: FDA

SAN FRANCISCO—A BCL2 inhibitor that previously proved active against chronic lymphocytic leukemia has shown activity in certain patients with acute myelogenous leukemia (AML) as well.

This phase 2 trial was the first use of the inhibitor, ABT-199 (or venetoclax), in patients with relapsed or refractory AML.

Five of 32 patients treated with ABT-199 achieved a complete response (CR) or CR with incomplete blood count recovery (CRi), and several more had stable disease.

The drug appeared to be particularly active in patients with IDH mutations.

Marina Konopleva, MD, PhD, of the University of Texas MD Anderson Cancer Center in Houston, presented these results at the 2014 ASH Annual Meeting (abstract 118). The research was funded by AbbVie, Inc., the company developing ABT-199.

The trial was launched on the basis of preclinical studies showing that ABT-199 could kill AML cell lines, patients’ AML cells, and patient-derived AML cells implanted in mice.

The researchers enrolled 32 AML patients, 30 of whom had relapsed or refractory disease. Patients had a median age of 71 (range, 19 to 84), and half were male.

The overall response rate was 15.5%, with 1 patient achieving a CR and 4 patients achieving a CRi. The researchers noted that 3 of the patients who had a CR/CRi had IDH mutations. Two of these patients also achieved minimal residual disease negativity.

The team said these results suggest single-agent ABT-199 can have considerable clinical activity in patients with relapsed or refractory AML, and patients with mutations in IDH genes may be particularly sensitive to the drug.

The researchers also found the median bone marrow blast count in evaluable patients decreased 36% after treatment with ABT-199. And 6 patients (19%) had at least a 50% reduction in bone marrow blasts.

Common adverse events following treatment (occurring in at least 25% of patients) included nausea, diarrhea, fatigue, neutropenia, and vomiting. Grade 3 and 4 adverse events (occurring in 3 or more patients) included febrile neutropenia, anemia, and pneumonia.

No patients died as a result of treatment-related adverse events.

Furthermore, the maximum-tolerated dose was not reached, leaving open the possibility of higher doses in further trials. The next step is to carry out trials combining ABT-199 with other agents. These trials are currently opening at several sites.

AbbVie said ABT-199 will be studied in combination with common AML treatments, and the company is developing ABT-199 for, and evaluating the drug in, several hematologic malignancies.

Pills

Credit: FDA

SAN FRANCISCO—A BCL2 inhibitor that previously proved active against chronic lymphocytic leukemia has shown activity in certain patients with acute myelogenous leukemia (AML) as well.

This phase 2 trial was the first use of the inhibitor, ABT-199 (or venetoclax), in patients with relapsed or refractory AML.

Five of 32 patients treated with ABT-199 achieved a complete response (CR) or CR with incomplete blood count recovery (CRi), and several more had stable disease.

The drug appeared to be particularly active in patients with IDH mutations.

Marina Konopleva, MD, PhD, of the University of Texas MD Anderson Cancer Center in Houston, presented these results at the 2014 ASH Annual Meeting (abstract 118). The research was funded by AbbVie, Inc., the company developing ABT-199.

The trial was launched on the basis of preclinical studies showing that ABT-199 could kill AML cell lines, patients’ AML cells, and patient-derived AML cells implanted in mice.

The researchers enrolled 32 AML patients, 30 of whom had relapsed or refractory disease. Patients had a median age of 71 (range, 19 to 84), and half were male.

The overall response rate was 15.5%, with 1 patient achieving a CR and 4 patients achieving a CRi. The researchers noted that 3 of the patients who had a CR/CRi had IDH mutations. Two of these patients also achieved minimal residual disease negativity.

The team said these results suggest single-agent ABT-199 can have considerable clinical activity in patients with relapsed or refractory AML, and patients with mutations in IDH genes may be particularly sensitive to the drug.

The researchers also found the median bone marrow blast count in evaluable patients decreased 36% after treatment with ABT-199. And 6 patients (19%) had at least a 50% reduction in bone marrow blasts.

Common adverse events following treatment (occurring in at least 25% of patients) included nausea, diarrhea, fatigue, neutropenia, and vomiting. Grade 3 and 4 adverse events (occurring in 3 or more patients) included febrile neutropenia, anemia, and pneumonia.

No patients died as a result of treatment-related adverse events.

Furthermore, the maximum-tolerated dose was not reached, leaving open the possibility of higher doses in further trials. The next step is to carry out trials combining ABT-199 with other agents. These trials are currently opening at several sites.

AbbVie said ABT-199 will be studied in combination with common AML treatments, and the company is developing ABT-199 for, and evaluating the drug in, several hematologic malignancies.

Chronic myeloid leukemia cells

PHILADELPHIA—New research suggests that stiffness in the extracellular matrix (ECM) can predict how leukemias will respond to therapy.

Using a 3D model, investigators demonstrated that ECM stiffness can affect treatment response in both chronic and acute myeloid leukemia.

The researchers believe that correcting for the matrix effect could give hematologists a new tool for personalizing leukemia treatment.

The team presented this research at the 2014 ASCB/IFCB meeting (poster 429).

Jae-Won Shin, PhD, and David Mooney, PhD, both of Harvard University, knew that myeloid leukemia subtypes are defined by distinct genetic mutations and the activation of known signaling pathways.

But the investigators wanted to see if changes in matrix stiffness played a part in cancer cell proliferation and if myeloid leukemia subtypes could be sorted out by their responses.

The researchers built a 3D hydrogel system with tunable stiffness and attempted to evaluate how relative stiffness of the surrounding ECM affected the resistance of human myeloid leukemias to chemotherapeutic drugs.

They found, for example, that chronic myeloid leukemias (CMLs) grown in their viscous 3D gel system were more resistant to the tyrosine kinase inhibitor imatinib than those cultured in a rigid matrix.

Using this and other data from their variable ECM system, the team screened libraries of small-molecule drugs, identifying a subset of drugs they say are more likely to be effective against CML, regardless of the surrounding matrix.

By correcting for the matrix effect, Drs Shin and Mooney believe their novel approach to drug screening could more precisely tailor chemotherapy to a patient’s individual malignancy.

The investigators’ 3D hydrogel system allowed them to vary the stiffness of the matrix and uncover different growth patterns, which they used to profile different leukemia subtypes.

They also looked at a cellular signaling pathway, protein kinase B (AKT), known to be involved in mechanotransduction and therefore sensitive to stiffness in different leukemia subtypes.

They discovered that CML cells in the 3D hydrogel were resistant to an AKT inhibitor, while acute myeloid leukemia cells grown in the same conditions were responsive to the drug, supporting their idea that a tunable matrix system could be a way to sort out leukemia subtypes by drug resistance.

Chronic myeloid leukemia cells

PHILADELPHIA—New research suggests that stiffness in the extracellular matrix (ECM) can predict how leukemias will respond to therapy.

Using a 3D model, investigators demonstrated that ECM stiffness can affect treatment response in both chronic and acute myeloid leukemia.

The researchers believe that correcting for the matrix effect could give hematologists a new tool for personalizing leukemia treatment.

The team presented this research at the 2014 ASCB/IFCB meeting (poster 429).

Jae-Won Shin, PhD, and David Mooney, PhD, both of Harvard University, knew that myeloid leukemia subtypes are defined by distinct genetic mutations and the activation of known signaling pathways.

But the investigators wanted to see if changes in matrix stiffness played a part in cancer cell proliferation and if myeloid leukemia subtypes could be sorted out by their responses.

The researchers built a 3D hydrogel system with tunable stiffness and attempted to evaluate how relative stiffness of the surrounding ECM affected the resistance of human myeloid leukemias to chemotherapeutic drugs.

They found, for example, that chronic myeloid leukemias (CMLs) grown in their viscous 3D gel system were more resistant to the tyrosine kinase inhibitor imatinib than those cultured in a rigid matrix.

Using this and other data from their variable ECM system, the team screened libraries of small-molecule drugs, identifying a subset of drugs they say are more likely to be effective against CML, regardless of the surrounding matrix.

By correcting for the matrix effect, Drs Shin and Mooney believe their novel approach to drug screening could more precisely tailor chemotherapy to a patient’s individual malignancy.

The investigators’ 3D hydrogel system allowed them to vary the stiffness of the matrix and uncover different growth patterns, which they used to profile different leukemia subtypes.

They also looked at a cellular signaling pathway, protein kinase B (AKT), known to be involved in mechanotransduction and therefore sensitive to stiffness in different leukemia subtypes.

They discovered that CML cells in the 3D hydrogel were resistant to an AKT inhibitor, while acute myeloid leukemia cells grown in the same conditions were responsive to the drug, supporting their idea that a tunable matrix system could be a way to sort out leukemia subtypes by drug resistance.

Chronic myeloid leukemia cells

PHILADELPHIA—New research suggests that stiffness in the extracellular matrix (ECM) can predict how leukemias will respond to therapy.

Using a 3D model, investigators demonstrated that ECM stiffness can affect treatment response in both chronic and acute myeloid leukemia.

The researchers believe that correcting for the matrix effect could give hematologists a new tool for personalizing leukemia treatment.

The team presented this research at the 2014 ASCB/IFCB meeting (poster 429).

Jae-Won Shin, PhD, and David Mooney, PhD, both of Harvard University, knew that myeloid leukemia subtypes are defined by distinct genetic mutations and the activation of known signaling pathways.

But the investigators wanted to see if changes in matrix stiffness played a part in cancer cell proliferation and if myeloid leukemia subtypes could be sorted out by their responses.

The researchers built a 3D hydrogel system with tunable stiffness and attempted to evaluate how relative stiffness of the surrounding ECM affected the resistance of human myeloid leukemias to chemotherapeutic drugs.

They found, for example, that chronic myeloid leukemias (CMLs) grown in their viscous 3D gel system were more resistant to the tyrosine kinase inhibitor imatinib than those cultured in a rigid matrix.

Using this and other data from their variable ECM system, the team screened libraries of small-molecule drugs, identifying a subset of drugs they say are more likely to be effective against CML, regardless of the surrounding matrix.

By correcting for the matrix effect, Drs Shin and Mooney believe their novel approach to drug screening could more precisely tailor chemotherapy to a patient’s individual malignancy.

The investigators’ 3D hydrogel system allowed them to vary the stiffness of the matrix and uncover different growth patterns, which they used to profile different leukemia subtypes.

They also looked at a cellular signaling pathway, protein kinase B (AKT), known to be involved in mechanotransduction and therefore sensitive to stiffness in different leukemia subtypes.

They discovered that CML cells in the 3D hydrogel were resistant to an AKT inhibitor, while acute myeloid leukemia cells grown in the same conditions were responsive to the drug, supporting their idea that a tunable matrix system could be a way to sort out leukemia subtypes by drug resistance.

SAN FRANCISCO – Adding a kinase inhibitor to a standard regimen for acute myeloid leukemia can prolong event-free and relapse-free survival in young adult patients, but the effect on overall survival is still unclear, investigators reported.

In a randomized controlled trial, 3-year event-free survival (EFS), the primary endpoint, was 40% among patients treated with chemotherapy and sorafenib (Nexavar), compared with 22% for patients treated with chemotherapy and a placebo (P = .013). The median EFS was 21 months and 9 months, respectively, reported Dr. Christoph Röllig of University Hospital in Dresden, Germany.

Relapse-free survival (RFS) at 3 years was 56% in the sorafenib-treated group, compared with 38% in the placebo group (P = .017). The median RFS was not reached in the sorafenib group, vs. 23 months in the placebo group, Dr. Röllig reported at the annual meeting of the American Society of Hematology.

“These data constitute the first randomized evidence that actually kinase inhibitors work in AML. What we judge is that, according to evidence-based medicine principles, a comparatory trial would be desirable in order to establish sorafenib in AML treatment,” he said at a briefing prior to his presentation of the data in a plenary session.

Dr. Röllig and colleagues in 25 centers enrolled patients from 18 to 60 years with newly diagnosed AML. Of the 276 enrolled, 267 went on to receive study treatment: 134 were assigned to sorafenib and 133 to placebo. The study drug was given along a chemotherapy regimen consisting of two cycles of induction with daunorubicin and cytarabine followed by three cycles of high-dose cytarabine consolidation. Patients who did not have a response after the first cycle of daunorubicin induction underwent a second induction attempt with cytarabine and mitoxantrone.

The assigned study medication was given on days 10-19 of induction cycles one and two, from day 8 of each consolidation cycle until 3 days before the start of the next consolidation cycle, and as maintenance for 12 months after the end of consolidation.

As noted before, EFS in an intention-to-treat analysis censored for stem-cell therapy favored the sorafenib-treated patients, as did RFS. In addition, there was evidence to suggest a benefit trend toward prolonged RFS and overall survival with sorafenib among patients positive for the FLT3-ITD mutation, which has been shown to be sensitive to kinase inhibitors.

Patients in the sorafenib arm had significantly more episodes of fever, bleeding events, and the hand-foot syndrome, but there were no significant differences in other adverse events, Dr. Röllig said.

In an interview, he said that the investigators chose sorafenib because of its good track record and its efficacy against multiple kinases. His center is also involved in clinical trials exploring whether a different kinase inhibitor, quizartinib, has similar or better efficacy against AML.

The study was supported by Bayer. Dr. Röllig reported having no relevant disclosures.

SAN FRANCISCO – Adding a kinase inhibitor to a standard regimen for acute myeloid leukemia can prolong event-free and relapse-free survival in young adult patients, but the effect on overall survival is still unclear, investigators reported.

In a randomized controlled trial, 3-year event-free survival (EFS), the primary endpoint, was 40% among patients treated with chemotherapy and sorafenib (Nexavar), compared with 22% for patients treated with chemotherapy and a placebo (P = .013). The median EFS was 21 months and 9 months, respectively, reported Dr. Christoph Röllig of University Hospital in Dresden, Germany.

Relapse-free survival (RFS) at 3 years was 56% in the sorafenib-treated group, compared with 38% in the placebo group (P = .017). The median RFS was not reached in the sorafenib group, vs. 23 months in the placebo group, Dr. Röllig reported at the annual meeting of the American Society of Hematology.

“These data constitute the first randomized evidence that actually kinase inhibitors work in AML. What we judge is that, according to evidence-based medicine principles, a comparatory trial would be desirable in order to establish sorafenib in AML treatment,” he said at a briefing prior to his presentation of the data in a plenary session.

Dr. Röllig and colleagues in 25 centers enrolled patients from 18 to 60 years with newly diagnosed AML. Of the 276 enrolled, 267 went on to receive study treatment: 134 were assigned to sorafenib and 133 to placebo. The study drug was given along a chemotherapy regimen consisting of two cycles of induction with daunorubicin and cytarabine followed by three cycles of high-dose cytarabine consolidation. Patients who did not have a response after the first cycle of daunorubicin induction underwent a second induction attempt with cytarabine and mitoxantrone.

The assigned study medication was given on days 10-19 of induction cycles one and two, from day 8 of each consolidation cycle until 3 days before the start of the next consolidation cycle, and as maintenance for 12 months after the end of consolidation.

As noted before, EFS in an intention-to-treat analysis censored for stem-cell therapy favored the sorafenib-treated patients, as did RFS. In addition, there was evidence to suggest a benefit trend toward prolonged RFS and overall survival with sorafenib among patients positive for the FLT3-ITD mutation, which has been shown to be sensitive to kinase inhibitors.

Patients in the sorafenib arm had significantly more episodes of fever, bleeding events, and the hand-foot syndrome, but there were no significant differences in other adverse events, Dr. Röllig said.

In an interview, he said that the investigators chose sorafenib because of its good track record and its efficacy against multiple kinases. His center is also involved in clinical trials exploring whether a different kinase inhibitor, quizartinib, has similar or better efficacy against AML.

The study was supported by Bayer. Dr. Röllig reported having no relevant disclosures.

SAN FRANCISCO – Adding a kinase inhibitor to a standard regimen for acute myeloid leukemia can prolong event-free and relapse-free survival in young adult patients, but the effect on overall survival is still unclear, investigators reported.

In a randomized controlled trial, 3-year event-free survival (EFS), the primary endpoint, was 40% among patients treated with chemotherapy and sorafenib (Nexavar), compared with 22% for patients treated with chemotherapy and a placebo (P = .013). The median EFS was 21 months and 9 months, respectively, reported Dr. Christoph Röllig of University Hospital in Dresden, Germany.

Relapse-free survival (RFS) at 3 years was 56% in the sorafenib-treated group, compared with 38% in the placebo group (P = .017). The median RFS was not reached in the sorafenib group, vs. 23 months in the placebo group, Dr. Röllig reported at the annual meeting of the American Society of Hematology.

“These data constitute the first randomized evidence that actually kinase inhibitors work in AML. What we judge is that, according to evidence-based medicine principles, a comparatory trial would be desirable in order to establish sorafenib in AML treatment,” he said at a briefing prior to his presentation of the data in a plenary session.

Dr. Röllig and colleagues in 25 centers enrolled patients from 18 to 60 years with newly diagnosed AML. Of the 276 enrolled, 267 went on to receive study treatment: 134 were assigned to sorafenib and 133 to placebo. The study drug was given along a chemotherapy regimen consisting of two cycles of induction with daunorubicin and cytarabine followed by three cycles of high-dose cytarabine consolidation. Patients who did not have a response after the first cycle of daunorubicin induction underwent a second induction attempt with cytarabine and mitoxantrone.

The assigned study medication was given on days 10-19 of induction cycles one and two, from day 8 of each consolidation cycle until 3 days before the start of the next consolidation cycle, and as maintenance for 12 months after the end of consolidation.

As noted before, EFS in an intention-to-treat analysis censored for stem-cell therapy favored the sorafenib-treated patients, as did RFS. In addition, there was evidence to suggest a benefit trend toward prolonged RFS and overall survival with sorafenib among patients positive for the FLT3-ITD mutation, which has been shown to be sensitive to kinase inhibitors.

Patients in the sorafenib arm had significantly more episodes of fever, bleeding events, and the hand-foot syndrome, but there were no significant differences in other adverse events, Dr. Röllig said.

In an interview, he said that the investigators chose sorafenib because of its good track record and its efficacy against multiple kinases. His center is also involved in clinical trials exploring whether a different kinase inhibitor, quizartinib, has similar or better efficacy against AML.

The study was supported by Bayer. Dr. Röllig reported having no relevant disclosures.

Prescription medications

Credit: CDC

Tamoxifen, a drug used to treat breast cancer, may be effective against myeloproliferative neoplasms (MPNs) and acute myeloid leukemia (AML) as well, according to research published in Cell Stem Cell.

The study showed that estrogens regulate the survival, proliferation, and self-renewal of stem cells that give rise to MPNs and AML.

Tamoxifen, which targets estrogen receptors, prevented JAK2^V617F-induced MPNs in mice and enhanced the effects of chemotherapy against MLL-AF9-induced AML.

“In this study, we demonstrate that tamoxifen has specific effects on certain cells in the bone marrow: the hematopoietic stem cells and their immediate descendants, known as multipotent progenitors,” explained study author Abel Sánchez-Aguilera, PhD, of Centro Nacional de Investigaciones Cardiovasculares (CNIC) in Madrid.

The researchers found that, unlike in breast cancer, where tamoxifen blocks the action of estrogens, in blood cells, the drug acts by imitating the function of the hormone.

Tamoxifen induced apoptosis in short-term hematopoietic stem cells (HSCs) and multipotent progenitors. But in quiescent, long-term HSCs, the drug prompted proliferation and partial loss of function, which was reversible.

Tamoxifen also prevented polycythemia vera-like MPN from developing in mice with HSCs expressing JAK2^V617F. The drug prevented MPN-associated neutrophilia and thrombocytosis; alleviated the early increase in red cell counts, hemoglobin, and hematocrit; decreased bone marrow megakaryocytes; and reduced MPN-associated splenomegaly.

Tamoxifen worked by restoring normal levels of apoptosis in mutant cells. It also prompted apoptosis of human JAK2^V617F+ hematopoietic stem and progenitor cells (HSPCs) in a xenograft model.

In these models, tamoxifen caused little alteration in the rest of the blood cells, which were maintained at normal levels even after prolonged treatment with the drug.

“Our results suggest that tamoxifen, at a similar dose used for the treatment of other diseases, might be useful to treat myeloproliferative neoplasms at various stages, without being toxic to normal blood cells,” said study author Simón Méndez-Ferrer, PhD, also of CNIC.

In addition, tamoxifen enhanced the effects of conventional chemotherapy on cancerous cells in mice with MLL-AF9-induced AML.

Tamoxifen- and vehicle-treated mice had similar numbers of MLL-AF9+ cells and HSPCs shortly after chemotherapy. But tamoxifen delayed the reappearance of circulating leukemic cells after chemotherapy.

Tamoxifen-treated mice had fewer leukemic cells in the bone marrow, spleen, and blood, although they ultimately died of their disease.

Nevertheless, the researchers concluded that tamoxifen could be a feasible treatment option for patients with MPNs or AML. And the fact that tamoxifen is already approved for clinical use increases the chances of these results leading to a clinical trial.

Prescription medications

Credit: CDC

Tamoxifen, a drug used to treat breast cancer, may be effective against myeloproliferative neoplasms (MPNs) and acute myeloid leukemia (AML) as well, according to research published in Cell Stem Cell.

The study showed that estrogens regulate the survival, proliferation, and self-renewal of stem cells that give rise to MPNs and AML.

Tamoxifen, which targets estrogen receptors, prevented JAK2^V617F-induced MPNs in mice and enhanced the effects of chemotherapy against MLL-AF9-induced AML.

“In this study, we demonstrate that tamoxifen has specific effects on certain cells in the bone marrow: the hematopoietic stem cells and their immediate descendants, known as multipotent progenitors,” explained study author Abel Sánchez-Aguilera, PhD, of Centro Nacional de Investigaciones Cardiovasculares (CNIC) in Madrid.

The researchers found that, unlike in breast cancer, where tamoxifen blocks the action of estrogens, in blood cells, the drug acts by imitating the function of the hormone.

Tamoxifen induced apoptosis in short-term hematopoietic stem cells (HSCs) and multipotent progenitors. But in quiescent, long-term HSCs, the drug prompted proliferation and partial loss of function, which was reversible.

Tamoxifen also prevented polycythemia vera-like MPN from developing in mice with HSCs expressing JAK2^V617F. The drug prevented MPN-associated neutrophilia and thrombocytosis; alleviated the early increase in red cell counts, hemoglobin, and hematocrit; decreased bone marrow megakaryocytes; and reduced MPN-associated splenomegaly.

Tamoxifen worked by restoring normal levels of apoptosis in mutant cells. It also prompted apoptosis of human JAK2^V617F+ hematopoietic stem and progenitor cells (HSPCs) in a xenograft model.

In these models, tamoxifen caused little alteration in the rest of the blood cells, which were maintained at normal levels even after prolonged treatment with the drug.

“Our results suggest that tamoxifen, at a similar dose used for the treatment of other diseases, might be useful to treat myeloproliferative neoplasms at various stages, without being toxic to normal blood cells,” said study author Simón Méndez-Ferrer, PhD, also of CNIC.

In addition, tamoxifen enhanced the effects of conventional chemotherapy on cancerous cells in mice with MLL-AF9-induced AML.

Tamoxifen- and vehicle-treated mice had similar numbers of MLL-AF9+ cells and HSPCs shortly after chemotherapy. But tamoxifen delayed the reappearance of circulating leukemic cells after chemotherapy.

Tamoxifen-treated mice had fewer leukemic cells in the bone marrow, spleen, and blood, although they ultimately died of their disease.

Nevertheless, the researchers concluded that tamoxifen could be a feasible treatment option for patients with MPNs or AML. And the fact that tamoxifen is already approved for clinical use increases the chances of these results leading to a clinical trial.

Prescription medications

Credit: CDC

Tamoxifen, a drug used to treat breast cancer, may be effective against myeloproliferative neoplasms (MPNs) and acute myeloid leukemia (AML) as well, according to research published in Cell Stem Cell.

The study showed that estrogens regulate the survival, proliferation, and self-renewal of stem cells that give rise to MPNs and AML.

Tamoxifen, which targets estrogen receptors, prevented JAK2^V617F-induced MPNs in mice and enhanced the effects of chemotherapy against MLL-AF9-induced AML.

“In this study, we demonstrate that tamoxifen has specific effects on certain cells in the bone marrow: the hematopoietic stem cells and their immediate descendants, known as multipotent progenitors,” explained study author Abel Sánchez-Aguilera, PhD, of Centro Nacional de Investigaciones Cardiovasculares (CNIC) in Madrid.

The researchers found that, unlike in breast cancer, where tamoxifen blocks the action of estrogens, in blood cells, the drug acts by imitating the function of the hormone.

Tamoxifen induced apoptosis in short-term hematopoietic stem cells (HSCs) and multipotent progenitors. But in quiescent, long-term HSCs, the drug prompted proliferation and partial loss of function, which was reversible.

Tamoxifen also prevented polycythemia vera-like MPN from developing in mice with HSCs expressing JAK2^V617F. The drug prevented MPN-associated neutrophilia and thrombocytosis; alleviated the early increase in red cell counts, hemoglobin, and hematocrit; decreased bone marrow megakaryocytes; and reduced MPN-associated splenomegaly.

Tamoxifen worked by restoring normal levels of apoptosis in mutant cells. It also prompted apoptosis of human JAK2^V617F+ hematopoietic stem and progenitor cells (HSPCs) in a xenograft model.

In these models, tamoxifen caused little alteration in the rest of the blood cells, which were maintained at normal levels even after prolonged treatment with the drug.

“Our results suggest that tamoxifen, at a similar dose used for the treatment of other diseases, might be useful to treat myeloproliferative neoplasms at various stages, without being toxic to normal blood cells,” said study author Simón Méndez-Ferrer, PhD, also of CNIC.

In addition, tamoxifen enhanced the effects of conventional chemotherapy on cancerous cells in mice with MLL-AF9-induced AML.

Tamoxifen- and vehicle-treated mice had similar numbers of MLL-AF9+ cells and HSPCs shortly after chemotherapy. But tamoxifen delayed the reappearance of circulating leukemic cells after chemotherapy.

Tamoxifen-treated mice had fewer leukemic cells in the bone marrow, spleen, and blood, although they ultimately died of their disease.

Nevertheless, the researchers concluded that tamoxifen could be a feasible treatment option for patients with MPNs or AML. And the fact that tamoxifen is already approved for clinical use increases the chances of these results leading to a clinical trial.

The US Food and Drug Administration (FDA) has granted orphan drug designation for Actimab-A, an alpha radiolabeled antibody, to treat patients over the age of 60 who are newly diagnosed with acute myeloid leukemia (AML).

Actimab-A consists of the CD33 antibody lintuzumab linked to the actinium-225 payload. The product is currently under investigation in a multicenter, phase 1/2 trial of elderly AML patients.

The company developing Actimab-A, Actinium Pharmaceuticals, Inc., recently announced positive interim data from this trial.

Nine patients were evaluable. They had a median age of 76 (range, 73-81) and intermediate- or poor-risk cytogenetics.

The median overall survival was 5.4 months (range, 2.2-24 months), but survival was better for the 7 patients who had secondary AML. These patients had a median overall survival of 9.1 months from study entry (range, 2.3-24 months).

Two secondary AML patients lived longer than 12 months, and the longest surviving patient lived more than 24 months.

Two dosing levels of Actimab-A have been evaluated to date (0.5 or 1.0 μCi/kg/fraction), and the study is ongoing at higher doses until the maximum tolerated dose is reached.

Actinium expects additional data from this trial to be available in 2015.

“The FDA’s decision to grant orphan drug status for Actimab-A is a significant milestone for the company and recognizes the need for innovative new approaches to treat AML,” said Kaushik J. Dave, PhD, President and CEO of Actinium.

“The designation will provide Actinium access to various development benefits and financial incentives from the agency, including an exemption from prescription drug user fees for Actimab-A for this indication and, if the drug receives marketing approval, it will enjoy 7 years of market exclusivity in the United States.”

The US Food and Drug Administration (FDA) has granted orphan drug designation for Actimab-A, an alpha radiolabeled antibody, to treat patients over the age of 60 who are newly diagnosed with acute myeloid leukemia (AML).

Actimab-A consists of the CD33 antibody lintuzumab linked to the actinium-225 payload. The product is currently under investigation in a multicenter, phase 1/2 trial of elderly AML patients.

The company developing Actimab-A, Actinium Pharmaceuticals, Inc., recently announced positive interim data from this trial.

Nine patients were evaluable. They had a median age of 76 (range, 73-81) and intermediate- or poor-risk cytogenetics.

The median overall survival was 5.4 months (range, 2.2-24 months), but survival was better for the 7 patients who had secondary AML. These patients had a median overall survival of 9.1 months from study entry (range, 2.3-24 months).

Two secondary AML patients lived longer than 12 months, and the longest surviving patient lived more than 24 months.

Two dosing levels of Actimab-A have been evaluated to date (0.5 or 1.0 μCi/kg/fraction), and the study is ongoing at higher doses until the maximum tolerated dose is reached.

Actinium expects additional data from this trial to be available in 2015.

“The FDA’s decision to grant orphan drug status for Actimab-A is a significant milestone for the company and recognizes the need for innovative new approaches to treat AML,” said Kaushik J. Dave, PhD, President and CEO of Actinium.

“The designation will provide Actinium access to various development benefits and financial incentives from the agency, including an exemption from prescription drug user fees for Actimab-A for this indication and, if the drug receives marketing approval, it will enjoy 7 years of market exclusivity in the United States.”

The US Food and Drug Administration (FDA) has granted orphan drug designation for Actimab-A, an alpha radiolabeled antibody, to treat patients over the age of 60 who are newly diagnosed with acute myeloid leukemia (AML).

Actimab-A consists of the CD33 antibody lintuzumab linked to the actinium-225 payload. The product is currently under investigation in a multicenter, phase 1/2 trial of elderly AML patients.

The company developing Actimab-A, Actinium Pharmaceuticals, Inc., recently announced positive interim data from this trial.

Nine patients were evaluable. They had a median age of 76 (range, 73-81) and intermediate- or poor-risk cytogenetics.

The median overall survival was 5.4 months (range, 2.2-24 months), but survival was better for the 7 patients who had secondary AML. These patients had a median overall survival of 9.1 months from study entry (range, 2.3-24 months).

Two secondary AML patients lived longer than 12 months, and the longest surviving patient lived more than 24 months.

Two dosing levels of Actimab-A have been evaluated to date (0.5 or 1.0 μCi/kg/fraction), and the study is ongoing at higher doses until the maximum tolerated dose is reached.

Actinium expects additional data from this trial to be available in 2015.

“The FDA’s decision to grant orphan drug status for Actimab-A is a significant milestone for the company and recognizes the need for innovative new approaches to treat AML,” said Kaushik J. Dave, PhD, President and CEO of Actinium.

“The designation will provide Actinium access to various development benefits and financial incentives from the agency, including an exemption from prescription drug user fees for Actimab-A for this indication and, if the drug receives marketing approval, it will enjoy 7 years of market exclusivity in the United States.”

AML cells in the bone marrow

Inhibiting the enzyme 5-lipoxygenase (5-LO) can eradicate cancer stem cell-like cells (CSCs) in acute myeloid leukemia (AML), according to a preclinical study

published in Cancer Research.

Previous research suggested the enzyme is needed to maintain CSCs in chronic myeloid leukemia.

So investigators theorized that 5-LO could be a therapeutic target for AML, as CSCs are thought to cause the spread and relapse of this disease.

To test that theory, the team evaluated the effects of 5-LO inhibition in a PML/RARα-positive model of AML. As a model of CSCs, they used Sca-1⁺/lin⁻ murine hematopoietic stem and progenitor cells (HSPCs), which were retrovirally transduced with PML/RARα.

The researchers targeted 5-LO genetically and pharmacologically. And they found that 5-LO inhibition interfered with the aberrant stem cell capacity of PML/RARα-expressing HSPCs.

Inhibiting 5-LO also inhibited Wnt signaling, which has been shown to be critical for CSC maintenance.

Additional investigation revealed that inhibition of Wnt signaling and CSCs was due to the generation of a catalytically inactive form of 5-LO, which hindered nuclear translocation of β-catenin.

Considering these results together, as well as evidence that CSCs mediate AML relapse, the investigators concluded that eradicating CSCs via 5-LO inhibition may offer a new treatment approach for AML.

“These results form the basis for a possible use of the 5-lipoxygenase inhibitors as stem cell therapy for a sustainable cure for acute myeloid leukemia,” said Martin Ruthardt, MD, of Goethe University in Frankfurt, Germany. “But this must firstly be studied further in preclinical and clinical studies in humans.”

“We are now in the process of examining the molecular mechanism in more detail in order to find out how the inhibitors precisely work on the leukemia stem cells,” added Thorsten Jürgen Maier, MD, PhD, of Goethe University and Aarhus University in Denmark. “We very much hope that our results will be of benefit for leukemia patients.”

AML cells in the bone marrow

Inhibiting the enzyme 5-lipoxygenase (5-LO) can eradicate cancer stem cell-like cells (CSCs) in acute myeloid leukemia (AML), according to a preclinical study

published in Cancer Research.

Previous research suggested the enzyme is needed to maintain CSCs in chronic myeloid leukemia.

So investigators theorized that 5-LO could be a therapeutic target for AML, as CSCs are thought to cause the spread and relapse of this disease.

To test that theory, the team evaluated the effects of 5-LO inhibition in a PML/RARα-positive model of AML. As a model of CSCs, they used Sca-1⁺/lin⁻ murine hematopoietic stem and progenitor cells (HSPCs), which were retrovirally transduced with PML/RARα.

The researchers targeted 5-LO genetically and pharmacologically. And they found that 5-LO inhibition interfered with the aberrant stem cell capacity of PML/RARα-expressing HSPCs.

Inhibiting 5-LO also inhibited Wnt signaling, which has been shown to be critical for CSC maintenance.

Additional investigation revealed that inhibition of Wnt signaling and CSCs was due to the generation of a catalytically inactive form of 5-LO, which hindered nuclear translocation of β-catenin.

Considering these results together, as well as evidence that CSCs mediate AML relapse, the investigators concluded that eradicating CSCs via 5-LO inhibition may offer a new treatment approach for AML.

“These results form the basis for a possible use of the 5-lipoxygenase inhibitors as stem cell therapy for a sustainable cure for acute myeloid leukemia,” said Martin Ruthardt, MD, of Goethe University in Frankfurt, Germany. “But this must firstly be studied further in preclinical and clinical studies in humans.”

“We are now in the process of examining the molecular mechanism in more detail in order to find out how the inhibitors precisely work on the leukemia stem cells,” added Thorsten Jürgen Maier, MD, PhD, of Goethe University and Aarhus University in Denmark. “We very much hope that our results will be of benefit for leukemia patients.”

AML cells in the bone marrow

Inhibiting the enzyme 5-lipoxygenase (5-LO) can eradicate cancer stem cell-like cells (CSCs) in acute myeloid leukemia (AML), according to a preclinical study

published in Cancer Research.

Previous research suggested the enzyme is needed to maintain CSCs in chronic myeloid leukemia.

So investigators theorized that 5-LO could be a therapeutic target for AML, as CSCs are thought to cause the spread and relapse of this disease.

To test that theory, the team evaluated the effects of 5-LO inhibition in a PML/RARα-positive model of AML. As a model of CSCs, they used Sca-1⁺/lin⁻ murine hematopoietic stem and progenitor cells (HSPCs), which were retrovirally transduced with PML/RARα.

The researchers targeted 5-LO genetically and pharmacologically. And they found that 5-LO inhibition interfered with the aberrant stem cell capacity of PML/RARα-expressing HSPCs.

Inhibiting 5-LO also inhibited Wnt signaling, which has been shown to be critical for CSC maintenance.

Additional investigation revealed that inhibition of Wnt signaling and CSCs was due to the generation of a catalytically inactive form of 5-LO, which hindered nuclear translocation of β-catenin.

Considering these results together, as well as evidence that CSCs mediate AML relapse, the investigators concluded that eradicating CSCs via 5-LO inhibition may offer a new treatment approach for AML.

“These results form the basis for a possible use of the 5-lipoxygenase inhibitors as stem cell therapy for a sustainable cure for acute myeloid leukemia,” said Martin Ruthardt, MD, of Goethe University in Frankfurt, Germany. “But this must firstly be studied further in preclinical and clinical studies in humans.”

“We are now in the process of examining the molecular mechanism in more detail in order to find out how the inhibitors precisely work on the leukemia stem cells,” added Thorsten Jürgen Maier, MD, PhD, of Goethe University and Aarhus University in Denmark. “We very much hope that our results will be of benefit for leukemia patients.”

Doctor and patient

Credit: NIH

In a phase 2 study, the anticancer quinolone derivative vosaroxin produced responses in poor-risk, elderly patients with previously untreated acute myeloid leukemia (AML), but most patients ultimately died.

Twenty-nine percent of patients achieved a complete response (CR) following treatment with vosaroxin.

However, 84% of patients discontinued treatment, most due to treatment failure. And 91% of patients died, most from disease progression.

Still, study investigators said single-agent vosaroxin shows promise as a treatment option for this group of patients, who are unlikely to benefit from standard induction chemotherapy.

“There remains an acute unmet medical need for new treatment options in AML, including patients 60 years of age and older who are unlikely to benefit from standard induction chemotherapy,” said Farhad Ravandi, MD, of the University of Texas MD Anderson Cancer Center.

“Vosaroxin is active and well-tolerated in this population, both as a single agent, as seen in [this] study, and in combination with decitabine, as seen in an ongoing MD Anderson Cancer Center-sponsored study.”

Dr Ravandi and his colleagues reported results of the phase 2 trial, called REVEAL-1, in the British Journal of Haematology. The study was sponsored by Sunesis Pharmaceuticals, the company developing vosaroxin.

The investigators evaluated vosaroxin in 113 patients aged 60 and older who had previously untreated AML with an unfavorable prognosis.

The patients’ median age was 75 years, and most (82%) had 2 or more risk factors, which included being 70 or older, having antecedent hematologic disease, having an ECOG performance status of 2, and having intermediate/unfavorable cytogenetics.

Patients received vosaroxin in sequential cohorts. In group A, they received 72 mg/m² on days 1, 8, and 15. In group B, they received 72 mg/m² on days 1 and 8. And in group C, they received 72 mg/m² or 90 mg/m² on days 1 and 4.

The primary efficacy endpoint was the combined CR rate and the rate of CR with incomplete platelet recovery (CRp). CR and CR/CRp rates were 29% and 32%, respectively. Responses occurred in all categories of risk factors, including in patients with 2 or more risk factors.

Ninety-five patients (84%) discontinued treatment due to treatment failure (n=50), death (n=21), unacceptable adverse events (n=6), relapse (n=5), their physician’s decision (n=5) or other reasons (n=8).

The all-cause mortality rate was 12% at 30 days and 31% at 60 days. The median overall survival (OS) was 7.0 months, and the 1-year OS rate was 34%.

Common grade 3/4 hematologic adverse events (occurring in 20% of patients or more) included thrombocytopenia (59%), febrile neutropenia (50%), anemia (49%), and neutropenia (29%).

Common grade 3/4 nonhematologic adverse events included sepsis (39%), pneumonia (30%), hypokalemia (25%), and oral mucositis/stomatitis (22%).

Ninety-one patients (81%) had one or more serious adverse event. The most common were pneumonia (24%), febrile neutropenia (21%), and oral mucositis/stomatitis (10%).

Of the 113 patients treated, 103 died. Most deaths (78%) were due to progressive disease.

Patients in group C (72 mg/m²) had the most favorable balance of safety and efficacy. They had faster hematologic recovery (a median of 27 days) than the other groups and the lowest incidence of aggregate sepsis (24%) and 30-day (7%) and 60-day (17%) all-cause mortality.

At this dose and schedule, CR and CR/CRp rates were 31% and 35%, respectively. The median OS was 7.7 months, and the 1-year OS rate was 38%.

“Publication of these data in the British Journal of Haematology further support our goal of establishing vosaroxin as a new standard of care in AML,” said Adam Craig, chief medical officer of Sunesis.

“Given ongoing demographic shifts in the US and other major territories, the challenge of treating AML in older adults will continue to grow, underscoring a need for new treatment options. We look forward to building on these data through further investigator-sponsored studies and, with the outcome of VALOR in relapsed or refractory AML, progressing towards initial regulatory approval.”

Based on results of the phase 3 VALOR trial, which were recently announced, Sunesis has filed a marketing authorization application with the European Medicines Agency and plans to meet with the US Food and Drug Administration to determine the appropriate regulatory path forward for vosaroxin in the treatment of relapsed or refractory AML.

Doctor and patient

Credit: NIH

In a phase 2 study, the anticancer quinolone derivative vosaroxin produced responses in poor-risk, elderly patients with previously untreated acute myeloid leukemia (AML), but most patients ultimately died.

Twenty-nine percent of patients achieved a complete response (CR) following treatment with vosaroxin.

However, 84% of patients discontinued treatment, most due to treatment failure. And 91% of patients died, most from disease progression.

Still, study investigators said single-agent vosaroxin shows promise as a treatment option for this group of patients, who are unlikely to benefit from standard induction chemotherapy.

“There remains an acute unmet medical need for new treatment options in AML, including patients 60 years of age and older who are unlikely to benefit from standard induction chemotherapy,” said Farhad Ravandi, MD, of the University of Texas MD Anderson Cancer Center.

“Vosaroxin is active and well-tolerated in this population, both as a single agent, as seen in [this] study, and in combination with decitabine, as seen in an ongoing MD Anderson Cancer Center-sponsored study.”

Dr Ravandi and his colleagues reported results of the phase 2 trial, called REVEAL-1, in the British Journal of Haematology. The study was sponsored by Sunesis Pharmaceuticals, the company developing vosaroxin.

The investigators evaluated vosaroxin in 113 patients aged 60 and older who had previously untreated AML with an unfavorable prognosis.

The patients’ median age was 75 years, and most (82%) had 2 or more risk factors, which included being 70 or older, having antecedent hematologic disease, having an ECOG performance status of 2, and having intermediate/unfavorable cytogenetics.

Patients received vosaroxin in sequential cohorts. In group A, they received 72 mg/m² on days 1, 8, and 15. In group B, they received 72 mg/m² on days 1 and 8. And in group C, they received 72 mg/m² or 90 mg/m² on days 1 and 4.

The primary efficacy endpoint was the combined CR rate and the rate of CR with incomplete platelet recovery (CRp). CR and CR/CRp rates were 29% and 32%, respectively. Responses occurred in all categories of risk factors, including in patients with 2 or more risk factors.

Ninety-five patients (84%) discontinued treatment due to treatment failure (n=50), death (n=21), unacceptable adverse events (n=6), relapse (n=5), their physician’s decision (n=5) or other reasons (n=8).

The all-cause mortality rate was 12% at 30 days and 31% at 60 days. The median overall survival (OS) was 7.0 months, and the 1-year OS rate was 34%.

Common grade 3/4 hematologic adverse events (occurring in 20% of patients or more) included thrombocytopenia (59%), febrile neutropenia (50%), anemia (49%), and neutropenia (29%).

Common grade 3/4 nonhematologic adverse events included sepsis (39%), pneumonia (30%), hypokalemia (25%), and oral mucositis/stomatitis (22%).

Ninety-one patients (81%) had one or more serious adverse event. The most common were pneumonia (24%), febrile neutropenia (21%), and oral mucositis/stomatitis (10%).

Of the 113 patients treated, 103 died. Most deaths (78%) were due to progressive disease.

Patients in group C (72 mg/m²) had the most favorable balance of safety and efficacy. They had faster hematologic recovery (a median of 27 days) than the other groups and the lowest incidence of aggregate sepsis (24%) and 30-day (7%) and 60-day (17%) all-cause mortality.

At this dose and schedule, CR and CR/CRp rates were 31% and 35%, respectively. The median OS was 7.7 months, and the 1-year OS rate was 38%.

“Publication of these data in the British Journal of Haematology further support our goal of establishing vosaroxin as a new standard of care in AML,” said Adam Craig, chief medical officer of Sunesis.

“Given ongoing demographic shifts in the US and other major territories, the challenge of treating AML in older adults will continue to grow, underscoring a need for new treatment options. We look forward to building on these data through further investigator-sponsored studies and, with the outcome of VALOR in relapsed or refractory AML, progressing towards initial regulatory approval.”

Based on results of the phase 3 VALOR trial, which were recently announced, Sunesis has filed a marketing authorization application with the European Medicines Agency and plans to meet with the US Food and Drug Administration to determine the appropriate regulatory path forward for vosaroxin in the treatment of relapsed or refractory AML.

Doctor and patient

Credit: NIH

In a phase 2 study, the anticancer quinolone derivative vosaroxin produced responses in poor-risk, elderly patients with previously untreated acute myeloid leukemia (AML), but most patients ultimately died.

Twenty-nine percent of patients achieved a complete response (CR) following treatment with vosaroxin.

However, 84% of patients discontinued treatment, most due to treatment failure. And 91% of patients died, most from disease progression.

Still, study investigators said single-agent vosaroxin shows promise as a treatment option for this group of patients, who are unlikely to benefit from standard induction chemotherapy.

“There remains an acute unmet medical need for new treatment options in AML, including patients 60 years of age and older who are unlikely to benefit from standard induction chemotherapy,” said Farhad Ravandi, MD, of the University of Texas MD Anderson Cancer Center.

“Vosaroxin is active and well-tolerated in this population, both as a single agent, as seen in [this] study, and in combination with decitabine, as seen in an ongoing MD Anderson Cancer Center-sponsored study.”

Dr Ravandi and his colleagues reported results of the phase 2 trial, called REVEAL-1, in the British Journal of Haematology. The study was sponsored by Sunesis Pharmaceuticals, the company developing vosaroxin.

The investigators evaluated vosaroxin in 113 patients aged 60 and older who had previously untreated AML with an unfavorable prognosis.

The patients’ median age was 75 years, and most (82%) had 2 or more risk factors, which included being 70 or older, having antecedent hematologic disease, having an ECOG performance status of 2, and having intermediate/unfavorable cytogenetics.

Patients received vosaroxin in sequential cohorts. In group A, they received 72 mg/m² on days 1, 8, and 15. In group B, they received 72 mg/m² on days 1 and 8. And in group C, they received 72 mg/m² or 90 mg/m² on days 1 and 4.

The primary efficacy endpoint was the combined CR rate and the rate of CR with incomplete platelet recovery (CRp). CR and CR/CRp rates were 29% and 32%, respectively. Responses occurred in all categories of risk factors, including in patients with 2 or more risk factors.

Ninety-five patients (84%) discontinued treatment due to treatment failure (n=50), death (n=21), unacceptable adverse events (n=6), relapse (n=5), their physician’s decision (n=5) or other reasons (n=8).

The all-cause mortality rate was 12% at 30 days and 31% at 60 days. The median overall survival (OS) was 7.0 months, and the 1-year OS rate was 34%.

Common grade 3/4 hematologic adverse events (occurring in 20% of patients or more) included thrombocytopenia (59%), febrile neutropenia (50%), anemia (49%), and neutropenia (29%).

Common grade 3/4 nonhematologic adverse events included sepsis (39%), pneumonia (30%), hypokalemia (25%), and oral mucositis/stomatitis (22%).

Ninety-one patients (81%) had one or more serious adverse event. The most common were pneumonia (24%), febrile neutropenia (21%), and oral mucositis/stomatitis (10%).

Of the 113 patients treated, 103 died. Most deaths (78%) were due to progressive disease.

Patients in group C (72 mg/m²) had the most favorable balance of safety and efficacy. They had faster hematologic recovery (a median of 27 days) than the other groups and the lowest incidence of aggregate sepsis (24%) and 30-day (7%) and 60-day (17%) all-cause mortality.

At this dose and schedule, CR and CR/CRp rates were 31% and 35%, respectively. The median OS was 7.7 months, and the 1-year OS rate was 38%.

“Publication of these data in the British Journal of Haematology further support our goal of establishing vosaroxin as a new standard of care in AML,” said Adam Craig, chief medical officer of Sunesis.

“Given ongoing demographic shifts in the US and other major territories, the challenge of treating AML in older adults will continue to grow, underscoring a need for new treatment options. We look forward to building on these data through further investigator-sponsored studies and, with the outcome of VALOR in relapsed or refractory AML, progressing towards initial regulatory approval.”

Based on results of the phase 3 VALOR trial, which were recently announced, Sunesis has filed a marketing authorization application with the European Medicines Agency and plans to meet with the US Food and Drug Administration to determine the appropriate regulatory path forward for vosaroxin in the treatment of relapsed or refractory AML.

AML cells

Credit: Lance Liotta

The US Food and Drug Administration (FDA) has granted orphan drug designation for the Axl inhibitor BGB324 to treat acute myeloid leukemia (AML).

BGB324 is a highly selective small molecule inhibitor of the Axl receptor tyrosine kinase. It blocks the epithelial-mesenchymal transition, a key driver in drug resistance and metastasis.

BerGenBio, the company developing BGB324, has estimated that more than 50% of AML patients have elevated levels of Axl.

And a study published in Blood last year showed that Axl inhibition by BGB324 prompts antileukemic activity in FLT3-mutated and FLT3-wild-type AML.

Earlier this month, BerGenBio said the first patient had been dosed in its multicenter phase 1b trial of BGB324 in patients with AML.

The primary goal of this 2-part trial is to investigate the safety and tolerability of BGB324 as a single agent and in combination with cytarabine. Secondary endpoints include clinical response and assessment of novel biomarkers.

The study will be conducted at 6 sites in Norway, Germany, and the US. BerGenBio expects data from this trial to be available in 2015.

The FDA’s orphan designation will provide BerGenBio with access to various development incentives for BGB324.

This includes tax credits for qualified clinical testing, exemption from prescription drug user fees for BGB324 in AML, and 7 years of market exclusivity in the US upon FDA approval.

AML cells

Credit: Lance Liotta

The US Food and Drug Administration (FDA) has granted orphan drug designation for the Axl inhibitor BGB324 to treat acute myeloid leukemia (AML).

BGB324 is a highly selective small molecule inhibitor of the Axl receptor tyrosine kinase. It blocks the epithelial-mesenchymal transition, a key driver in drug resistance and metastasis.

BerGenBio, the company developing BGB324, has estimated that more than 50% of AML patients have elevated levels of Axl.

And a study published in Blood last year showed that Axl inhibition by BGB324 prompts antileukemic activity in FLT3-mutated and FLT3-wild-type AML.

Earlier this month, BerGenBio said the first patient had been dosed in its multicenter phase 1b trial of BGB324 in patients with AML.

The primary goal of this 2-part trial is to investigate the safety and tolerability of BGB324 as a single agent and in combination with cytarabine. Secondary endpoints include clinical response and assessment of novel biomarkers.

The study will be conducted at 6 sites in Norway, Germany, and the US. BerGenBio expects data from this trial to be available in 2015.

The FDA’s orphan designation will provide BerGenBio with access to various development incentives for BGB324.

This includes tax credits for qualified clinical testing, exemption from prescription drug user fees for BGB324 in AML, and 7 years of market exclusivity in the US upon FDA approval.

AML cells

Credit: Lance Liotta

The US Food and Drug Administration (FDA) has granted orphan drug designation for the Axl inhibitor BGB324 to treat acute myeloid leukemia (AML).

BGB324 is a highly selective small molecule inhibitor of the Axl receptor tyrosine kinase. It blocks the epithelial-mesenchymal transition, a key driver in drug resistance and metastasis.

BerGenBio, the company developing BGB324, has estimated that more than 50% of AML patients have elevated levels of Axl.

And a study published in Blood last year showed that Axl inhibition by BGB324 prompts antileukemic activity in FLT3-mutated and FLT3-wild-type AML.

Earlier this month, BerGenBio said the first patient had been dosed in its multicenter phase 1b trial of BGB324 in patients with AML.

The primary goal of this 2-part trial is to investigate the safety and tolerability of BGB324 as a single agent and in combination with cytarabine. Secondary endpoints include clinical response and assessment of novel biomarkers.

The study will be conducted at 6 sites in Norway, Germany, and the US. BerGenBio expects data from this trial to be available in 2015.

The FDA’s orphan designation will provide BerGenBio with access to various development incentives for BGB324.

This includes tax credits for qualified clinical testing, exemption from prescription drug user fees for BGB324 in AML, and 7 years of market exclusivity in the US upon FDA approval.

Daniel Pollyea, MD

Credit: University of Colorado

BARCELONA—An agent that inhibits isocitrate dehydrogenase (IDH) 1 shows the potential to transform therapy for certain patients with acute myeloid leukemia (AML), according to a speaker at the 26th EORTC-NCI-AACR Symposium on Molecular Targets and Cancer Therapeutics.

The drug, known as AG-120, demonstrated clinical activity and was considered to be well-tolerated in a phase 1 study of patients with advanced, IDH1 mutant-positive AML.

Daniel Pollyea, MD, of the University of Colorado School of Medicine in Aurora, presented data on AG-120 at the symposium as abstract LBA1. The research was sponsored by Agios Pharmaceuticals, makers of AG-120.

“This is the first study in humans of an inhibitor of mutant IDH1 and the first demonstration of clinical activity of AG-120 in AML patients whose cancers have the IDH1 mutation,” Dr Pollyea said. “Although the data are early, we are encouraged to see evidence of clinical activity, as the primary objectives of phase 1 studies are to determine safety and tolerability.”

Dr Pollyea noted that mutations in IDH1 lead to a cascade of metabolic events that contribute to malignancy. Mutant IDH1 produces an excess amount of 2-hydroxyglutarate (2-HG), which prevents cells from maturing into normal, functioning cells, and this leads to malignancy.

In this study, the researchers found that AG-120 reduced 2-HG levels in diseased cells to normal levels, allowing them to mature into normal cells.

The trial included 17 patients with relapsed and/or refractory AML, who had received a median of 2 prior treatments. Patients were scheduled to

receive AG-120 in 1 of 4 dose groups: 100 mg twice a day, 300 mg once a day, 500 mg once a day, and 800 mg once a day over continuous 28-day cycles.

Fourteen patients were evaluable for response, and 7 responded. Four patients achieved a complete response, 2 had a complete response in the marrow, and 1 had a partial response.

Responses occurred at all the dose levels tested. In the 4 patients who achieved a complete response, there was early evidence of durability, ranging from 15 days to 5 months. All responding patients remain on AG-120, and 1 patient with stable disease remains on the drug.

“AML is a devastating disease that has historically been very difficult to treat, and these findings suggest that AG-120 has the potential to transform therapy for patients with IDH1-mutant positive AML,” Dr Pollyea said.

He and his colleagues also found that AG-120 was generally well-tolerated. The majority of adverse events were grade 1 and 2. The most common of these were nausea, fatigue, and dyspnea.

Eight patients experienced serious adverse events, but these were primarily related to disease progression.

One patient experienced a dose-limiting toxicity of asymptomatic grade 3 QT prolongation at the highest dose tested to date, which improved to grade 1 with dose reduction. This patient is in complete remission and remains on AG-120.

The maximum-tolerated dose of AG-120 has not been reached.

There were 6 patient deaths, all unrelated to AG-120. Five deaths occurred after patients discontinued treatment due to progressive disease, and 1 patient died due to disease-related intracranial hemorrhage while on treatment.

Dr Pollyea and his colleagues are continuing this study with the aim of fully understanding the safety of the drug, determining the maximum-tolerated dose, and assessing its efficacy in treating AML and myelodysplastic syndromes.

Daniel Pollyea, MD

Credit: University of Colorado

BARCELONA—An agent that inhibits isocitrate dehydrogenase (IDH) 1 shows the potential to transform therapy for certain patients with acute myeloid leukemia (AML), according to a speaker at the 26th EORTC-NCI-AACR Symposium on Molecular Targets and Cancer Therapeutics.

The drug, known as AG-120, demonstrated clinical activity and was considered to be well-tolerated in a phase 1 study of patients with advanced, IDH1 mutant-positive AML.

Daniel Pollyea, MD, of the University of Colorado School of Medicine in Aurora, presented data on AG-120 at the symposium as abstract LBA1. The research was sponsored by Agios Pharmaceuticals, makers of AG-120.

“This is the first study in humans of an inhibitor of mutant IDH1 and the first demonstration of clinical activity of AG-120 in AML patients whose cancers have the IDH1 mutation,” Dr Pollyea said. “Although the data are early, we are encouraged to see evidence of clinical activity, as the primary objectives of phase 1 studies are to determine safety and tolerability.”

Dr Pollyea noted that mutations in IDH1 lead to a cascade of metabolic events that contribute to malignancy. Mutant IDH1 produces an excess amount of 2-hydroxyglutarate (2-HG), which prevents cells from maturing into normal, functioning cells, and this leads to malignancy.

In this study, the researchers found that AG-120 reduced 2-HG levels in diseased cells to normal levels, allowing them to mature into normal cells.

The trial included 17 patients with relapsed and/or refractory AML, who had received a median of 2 prior treatments. Patients were scheduled to

receive AG-120 in 1 of 4 dose groups: 100 mg twice a day, 300 mg once a day, 500 mg once a day, and 800 mg once a day over continuous 28-day cycles.

Fourteen patients were evaluable for response, and 7 responded. Four patients achieved a complete response, 2 had a complete response in the marrow, and 1 had a partial response.

Responses occurred at all the dose levels tested. In the 4 patients who achieved a complete response, there was early evidence of durability, ranging from 15 days to 5 months. All responding patients remain on AG-120, and 1 patient with stable disease remains on the drug.

“AML is a devastating disease that has historically been very difficult to treat, and these findings suggest that AG-120 has the potential to transform therapy for patients with IDH1-mutant positive AML,” Dr Pollyea said.

He and his colleagues also found that AG-120 was generally well-tolerated. The majority of adverse events were grade 1 and 2. The most common of these were nausea, fatigue, and dyspnea.

Eight patients experienced serious adverse events, but these were primarily related to disease progression.

One patient experienced a dose-limiting toxicity of asymptomatic grade 3 QT prolongation at the highest dose tested to date, which improved to grade 1 with dose reduction. This patient is in complete remission and remains on AG-120.

The maximum-tolerated dose of AG-120 has not been reached.

There were 6 patient deaths, all unrelated to AG-120. Five deaths occurred after patients discontinued treatment due to progressive disease, and 1 patient died due to disease-related intracranial hemorrhage while on treatment.

Dr Pollyea and his colleagues are continuing this study with the aim of fully understanding the safety of the drug, determining the maximum-tolerated dose, and assessing its efficacy in treating AML and myelodysplastic syndromes.

Daniel Pollyea, MD

Credit: University of Colorado

BARCELONA—An agent that inhibits isocitrate dehydrogenase (IDH) 1 shows the potential to transform therapy for certain patients with acute myeloid leukemia (AML), according to a speaker at the 26th EORTC-NCI-AACR Symposium on Molecular Targets and Cancer Therapeutics.

The drug, known as AG-120, demonstrated clinical activity and was considered to be well-tolerated in a phase 1 study of patients with advanced, IDH1 mutant-positive AML.

Daniel Pollyea, MD, of the University of Colorado School of Medicine in Aurora, presented data on AG-120 at the symposium as abstract LBA1. The research was sponsored by Agios Pharmaceuticals, makers of AG-120.

“This is the first study in humans of an inhibitor of mutant IDH1 and the first demonstration of clinical activity of AG-120 in AML patients whose cancers have the IDH1 mutation,” Dr Pollyea said. “Although the data are early, we are encouraged to see evidence of clinical activity, as the primary objectives of phase 1 studies are to determine safety and tolerability.”

Dr Pollyea noted that mutations in IDH1 lead to a cascade of metabolic events that contribute to malignancy. Mutant IDH1 produces an excess amount of 2-hydroxyglutarate (2-HG), which prevents cells from maturing into normal, functioning cells, and this leads to malignancy.

In this study, the researchers found that AG-120 reduced 2-HG levels in diseased cells to normal levels, allowing them to mature into normal cells.

The trial included 17 patients with relapsed and/or refractory AML, who had received a median of 2 prior treatments. Patients were scheduled to

receive AG-120 in 1 of 4 dose groups: 100 mg twice a day, 300 mg once a day, 500 mg once a day, and 800 mg once a day over continuous 28-day cycles.

Fourteen patients were evaluable for response, and 7 responded. Four patients achieved a complete response, 2 had a complete response in the marrow, and 1 had a partial response.

Responses occurred at all the dose levels tested. In the 4 patients who achieved a complete response, there was early evidence of durability, ranging from 15 days to 5 months. All responding patients remain on AG-120, and 1 patient with stable disease remains on the drug.

“AML is a devastating disease that has historically been very difficult to treat, and these findings suggest that AG-120 has the potential to transform therapy for patients with IDH1-mutant positive AML,” Dr Pollyea said.

He and his colleagues also found that AG-120 was generally well-tolerated. The majority of adverse events were grade 1 and 2. The most common of these were nausea, fatigue, and dyspnea.

Eight patients experienced serious adverse events, but these were primarily related to disease progression.

One patient experienced a dose-limiting toxicity of asymptomatic grade 3 QT prolongation at the highest dose tested to date, which improved to grade 1 with dose reduction. This patient is in complete remission and remains on AG-120.

The maximum-tolerated dose of AG-120 has not been reached.

There were 6 patient deaths, all unrelated to AG-120. Five deaths occurred after patients discontinued treatment due to progressive disease, and 1 patient died due to disease-related intracranial hemorrhage while on treatment.

Dr Pollyea and his colleagues are continuing this study with the aim of fully understanding the safety of the drug, determining the maximum-tolerated dose, and assessing its efficacy in treating AML and myelodysplastic syndromes.