EHA Congress 2016

COPENHAGEN – In a classic case of clinical sibling rivalry, results of the POLLUX trial support the benefits of adding daratumumab to lenalidomide and dexamethasone in patients with relapsed/refractory multiple myeloma, echoing results reported a few days earlier by investigators in the twin (and archly named) CASTOR trial

Among 569 patients with relapsed/refractory multiple myeloma, the addition of the anti-CD38 monoclonal antibody daratumumab (Darzalex) to lenalidomide (Revlimid) and dexamethasone was associated with a 63% reduction in the risk of disease progress or death, compared with len-dex alone, reported Dr. Meletios A Dimopoulos of the National and Kapodistrian University of Athens.

With daratumumab and len-dex, “there is the highest-ever response rate seen in relapsed or refractory myeloma; 93% of the patients achieved at least a partial response, and more importantly, 43% of the patients achieved a complete response,” he said at a briefing prior to his presentation of the data at the annual congress of the European Hematology Association.

“The addition of daratumumab to lenalidomide and dexamethasone induces deep and durable responses. Data indicate that we can achieve minimal residual disease negativity status in a significant number of patients,” he added.

The trial was halted on May 20, 2016, after a preplanned interim analysis showed a significant improvement in the primary endpoint of a progression-free survival, compared with len-dex alone.

Dizygotic twins

Like their mythologic namesakes, who were twin sons from different fathers, the CASTOR and POLLUX trials differed somewhat in the patient populations treated and in trial design. The CASTOR trial is looking at the addition of daratumumab to bortezomib (Velcade) and dexamethasone, and excludes patients resistant to bortezomib. The POLLUX trial includes bortezomib-resistant patients, but excludes lenalidomide-resistant patients.

In addition, in CASTOR, patients were treated with the assigned regimen for a specified number of courses, followed by daratumumab maintenance, whereas patients in both arms in POLLUX continued on their assigned therapy until disease progression or unacceptable toxicity occurred.

POLLUX was a multicenter, randomized, open-label phase III trial in patients with relapsed/refractory multiple myeloma following one or more prior lines of therapy. They were randomized on a 1:1 basis to either len-dex (283 patients) or len-dex plus intravenous daratumumab at a dose of 16 mg/kg once a week during treatment cycles 1 and 2, every 2 weeks during cycles 3-6, and once only on day 1 of subsequent cycles.

After a median follow-up of 13.5 months, the median progression-free survival for patients treated with len-dex alone was 18.4 months, but the median was not yet reached among patients treated with daratumumab. The difference translated into a hazard ratio for progression-free survival with daratumumab of 0.37 (P less than .0001).

In addition, the antibody was associated with a significantly better overall response rate (93% for daratumumab vs. 76% for len-dex only; P less than .0001), as well as better rates of complete responses (43% vs. 19%, respectively; P less than .0001), and very good partial responses or better (76% vs. 44%, P less than .0001).

The combination was generally well tolerated, with adverse events consistent with the known safety profile of len-dex. Infusion reactions with daratumumab were generally mild, and tended to occur during the first infusion, Dr. Dimopoulos said.

Dr. Anton Hagenbeek, professor of hematology at the University of Amsterdam (the Netherlands), who moderated the briefing, commented that the progression-free survival curves with daratumumab appeared to plateau, and asked whether any patients in the trial could be considered to have been “cured.”

Dr. Dimopoulos replied that “although we believe that in the relapsed setting of myeloma, it is unlikely to achieve the cure rate, we are optimistic that there will be a sizable number of patients that will remain without progression for many months. Already from single-agent daratumumab where this patient population is far more heavily pretreated, there are patients who are without progression for several years.”

Dr. Dimopoulos has previously disclosed honoraria from Janssen, maker of daratumumab. Dr. Hagenbeek disclosed serving on an advisory board for Takeda, maker of bortezomib.

COPENHAGEN – In a classic case of clinical sibling rivalry, results of the POLLUX trial support the benefits of adding daratumumab to lenalidomide and dexamethasone in patients with relapsed/refractory multiple myeloma, echoing results reported a few days earlier by investigators in the twin (and archly named) CASTOR trial

Among 569 patients with relapsed/refractory multiple myeloma, the addition of the anti-CD38 monoclonal antibody daratumumab (Darzalex) to lenalidomide (Revlimid) and dexamethasone was associated with a 63% reduction in the risk of disease progress or death, compared with len-dex alone, reported Dr. Meletios A Dimopoulos of the National and Kapodistrian University of Athens.

With daratumumab and len-dex, “there is the highest-ever response rate seen in relapsed or refractory myeloma; 93% of the patients achieved at least a partial response, and more importantly, 43% of the patients achieved a complete response,” he said at a briefing prior to his presentation of the data at the annual congress of the European Hematology Association.

“The addition of daratumumab to lenalidomide and dexamethasone induces deep and durable responses. Data indicate that we can achieve minimal residual disease negativity status in a significant number of patients,” he added.

The trial was halted on May 20, 2016, after a preplanned interim analysis showed a significant improvement in the primary endpoint of a progression-free survival, compared with len-dex alone.

Dizygotic twins

Like their mythologic namesakes, who were twin sons from different fathers, the CASTOR and POLLUX trials differed somewhat in the patient populations treated and in trial design. The CASTOR trial is looking at the addition of daratumumab to bortezomib (Velcade) and dexamethasone, and excludes patients resistant to bortezomib. The POLLUX trial includes bortezomib-resistant patients, but excludes lenalidomide-resistant patients.

In addition, in CASTOR, patients were treated with the assigned regimen for a specified number of courses, followed by daratumumab maintenance, whereas patients in both arms in POLLUX continued on their assigned therapy until disease progression or unacceptable toxicity occurred.

POLLUX was a multicenter, randomized, open-label phase III trial in patients with relapsed/refractory multiple myeloma following one or more prior lines of therapy. They were randomized on a 1:1 basis to either len-dex (283 patients) or len-dex plus intravenous daratumumab at a dose of 16 mg/kg once a week during treatment cycles 1 and 2, every 2 weeks during cycles 3-6, and once only on day 1 of subsequent cycles.

After a median follow-up of 13.5 months, the median progression-free survival for patients treated with len-dex alone was 18.4 months, but the median was not yet reached among patients treated with daratumumab. The difference translated into a hazard ratio for progression-free survival with daratumumab of 0.37 (P less than .0001).

In addition, the antibody was associated with a significantly better overall response rate (93% for daratumumab vs. 76% for len-dex only; P less than .0001), as well as better rates of complete responses (43% vs. 19%, respectively; P less than .0001), and very good partial responses or better (76% vs. 44%, P less than .0001).

The combination was generally well tolerated, with adverse events consistent with the known safety profile of len-dex. Infusion reactions with daratumumab were generally mild, and tended to occur during the first infusion, Dr. Dimopoulos said.

Dr. Anton Hagenbeek, professor of hematology at the University of Amsterdam (the Netherlands), who moderated the briefing, commented that the progression-free survival curves with daratumumab appeared to plateau, and asked whether any patients in the trial could be considered to have been “cured.”

Dr. Dimopoulos replied that “although we believe that in the relapsed setting of myeloma, it is unlikely to achieve the cure rate, we are optimistic that there will be a sizable number of patients that will remain without progression for many months. Already from single-agent daratumumab where this patient population is far more heavily pretreated, there are patients who are without progression for several years.”

Dr. Dimopoulos has previously disclosed honoraria from Janssen, maker of daratumumab. Dr. Hagenbeek disclosed serving on an advisory board for Takeda, maker of bortezomib.

COPENHAGEN – In a classic case of clinical sibling rivalry, results of the POLLUX trial support the benefits of adding daratumumab to lenalidomide and dexamethasone in patients with relapsed/refractory multiple myeloma, echoing results reported a few days earlier by investigators in the twin (and archly named) CASTOR trial

Among 569 patients with relapsed/refractory multiple myeloma, the addition of the anti-CD38 monoclonal antibody daratumumab (Darzalex) to lenalidomide (Revlimid) and dexamethasone was associated with a 63% reduction in the risk of disease progress or death, compared with len-dex alone, reported Dr. Meletios A Dimopoulos of the National and Kapodistrian University of Athens.

With daratumumab and len-dex, “there is the highest-ever response rate seen in relapsed or refractory myeloma; 93% of the patients achieved at least a partial response, and more importantly, 43% of the patients achieved a complete response,” he said at a briefing prior to his presentation of the data at the annual congress of the European Hematology Association.

“The addition of daratumumab to lenalidomide and dexamethasone induces deep and durable responses. Data indicate that we can achieve minimal residual disease negativity status in a significant number of patients,” he added.

The trial was halted on May 20, 2016, after a preplanned interim analysis showed a significant improvement in the primary endpoint of a progression-free survival, compared with len-dex alone.

Dizygotic twins

Like their mythologic namesakes, who were twin sons from different fathers, the CASTOR and POLLUX trials differed somewhat in the patient populations treated and in trial design. The CASTOR trial is looking at the addition of daratumumab to bortezomib (Velcade) and dexamethasone, and excludes patients resistant to bortezomib. The POLLUX trial includes bortezomib-resistant patients, but excludes lenalidomide-resistant patients.

In addition, in CASTOR, patients were treated with the assigned regimen for a specified number of courses, followed by daratumumab maintenance, whereas patients in both arms in POLLUX continued on their assigned therapy until disease progression or unacceptable toxicity occurred.

POLLUX was a multicenter, randomized, open-label phase III trial in patients with relapsed/refractory multiple myeloma following one or more prior lines of therapy. They were randomized on a 1:1 basis to either len-dex (283 patients) or len-dex plus intravenous daratumumab at a dose of 16 mg/kg once a week during treatment cycles 1 and 2, every 2 weeks during cycles 3-6, and once only on day 1 of subsequent cycles.

After a median follow-up of 13.5 months, the median progression-free survival for patients treated with len-dex alone was 18.4 months, but the median was not yet reached among patients treated with daratumumab. The difference translated into a hazard ratio for progression-free survival with daratumumab of 0.37 (P less than .0001).

In addition, the antibody was associated with a significantly better overall response rate (93% for daratumumab vs. 76% for len-dex only; P less than .0001), as well as better rates of complete responses (43% vs. 19%, respectively; P less than .0001), and very good partial responses or better (76% vs. 44%, P less than .0001).

The combination was generally well tolerated, with adverse events consistent with the known safety profile of len-dex. Infusion reactions with daratumumab were generally mild, and tended to occur during the first infusion, Dr. Dimopoulos said.

Dr. Anton Hagenbeek, professor of hematology at the University of Amsterdam (the Netherlands), who moderated the briefing, commented that the progression-free survival curves with daratumumab appeared to plateau, and asked whether any patients in the trial could be considered to have been “cured.”

Dr. Dimopoulos replied that “although we believe that in the relapsed setting of myeloma, it is unlikely to achieve the cure rate, we are optimistic that there will be a sizable number of patients that will remain without progression for many months. Already from single-agent daratumumab where this patient population is far more heavily pretreated, there are patients who are without progression for several years.”

Dr. Dimopoulos has previously disclosed honoraria from Janssen, maker of daratumumab. Dr. Hagenbeek disclosed serving on an advisory board for Takeda, maker of bortezomib.

Meletios A. Dimopoulos, MD

COPENHAGEN—The combination of daratumumab, lenalidomide, and dexamethasone (DRd) could become a new standard of care for patients with relapsed or refractory multiple myeloma (MM), according to a speaker at the 21st Congress of the European Hematology Association.

In the phase 3 POLLUX study, DRd conferred the highest response rate reported to date in the treatment of relapsed/refractory MM.

DRd also significantly improved progression free survival (PFS) when compared to treatment with lenalidomide and dexamethasone (Rd).

In addition, the safety profile of DRd was manageable and consistent with results observed in previous studies, according to Meletios A. Dimopoulos, MD, of the National and Kapodistrian University of Athens in Greece.

Dr Dimopoulos presented these results at the congress as abstract LB2238. The POLLUX study was funded by Janssen Research & Development, LLC.

Treatment and patients

POLLUX was a randomized, double-blind study that enrolled 569 patients with relapsed or refractory MM. Patients had received 1 or more prior lines of therapy and had progressive disease.

The patients were randomized to receive DRd (n=286) or Rd (n=283). All patients received lenalidomide at 25 mg on days 1-21 of each cycle until disease progression. They also received dexamethasone at 40 mg weekly until disease progression.

Patients in the daratumumab arm also received daratumumab at 16 mg/kg once a week in cycles 1-2, every other week in cycles 3-6, and once every 4 weeks until disease progression.

Dr Dimopoulos noted that patient and disease features were equally distributed between the treatment arms. The median age was 65 in both arms (overall range, 34-89). About half of patients in each arm had ISS stage I disease, and patients were, roughly, a median of 4 years from diagnosis.

In both arms, patients had a median of 1 prior lines of therapy (overall range, 1-11). Roughly 60% of patients in both arms had received a prior transplant, 86% had received a proteasome inhibitor, 55% had received an immunomodulatory agent, 18% had prior lenalidomide, and 44% had received a proteasome inhibitor and an immunomodulatory agent.

Roughly 28% of patients in each arm were refractory to a proteasome inhibitor, and nearly 30% were refractory to their last line of therapy.

Results

At a median follow-up of 13.5 months, about 35% of patients had discontinued treatment—23% in the DRd arm and 47% in the Rd arm.

Reasons for discontinuation included disease progression (14% and 34%, respectively), adverse events (7% and 8%, respectively), non-compliance with study drug (0.4% and 2%, respectively), withdrawal by patient (0.4% and 2%, respectively), physician decision (1% and 0.7%, respectively), and death (0.7% and 0.4%, respectively).

The study’s primary endpoint was PFS. The median PFS has not been reached in the DRd arm and was 18.4 months in the Rd arm. The 12-month PFS was 83% and 60%, respectively, and the 18-month PFS was 78% and 52%, respectively.

“There is an unprecedented improvement of progression-free survival in favor of daratumumab with lenalidomide and dexamethasone, with a hazard ratio of 0.37 [95% CI, 0.27-0.52; P<0.0001], which corresponds to a 63% reduction in the risk of progressive disease or death in favor of DRd,” Dr Dimopoulos said.

He also pointed out that the improvement in PFS for the DRd arm was seen across all patient subgroups, regardless of age, ISS stage, prior treatment, and type of MM.

Furthermore, response rates were significantly higher in the DRd arm than in the Rd arm. The overall response rates were 93% and 76%, respectively (P<0.0001). And the complete response rates were 43% and 19%, respectively (P<0.0001).

“This trial was associated with the highest response ever reported—so far, at least—in the treatment of relapsed/refractory myeloma,” Dr Dimopoulos noted.

The median duration of response was not reached in the DRd arm and was 17.4 months in the Rd arm.

In addition, there was an overall survival advantage with DRd. The 18-month overall survival was 86% in the DRd arm and 76% in the Rd arm. The hazard ratio was 0.64 (95% CI, 0.40-1.01; P=0.0534).

As for safety, the most common hematologic adverse events (in the DRd and Rd arms, respectively) were neutropenia (59% and 43%), anemia (31% and 35%), thrombocytopenia (27% for both), lymphopenia (6% and 5%), and febrile neutropenia (6% and 3%).

The most common non-hematologic adverse events (in the DRd and Rd arms, respectively) were diarrhea (43% and 25%), fatigue (35% and 28%), upper respiratory tract infection (32% and 21%), constipation (29% and 25%), cough (29% and 13%), muscle spasms (26% and 19%), and pneumonia (14% and 13%).

“DRd has a manageable safety profile consistent with the known safety profile of daratumumab or Rd alone,” Dr Dimopoulos said. “And we believe the combination of daratumumab with lenalidomide and dexamethasone potentially represents a new standard of care for myeloma patients after 1 or more prior lines of therapy.”

Meletios A. Dimopoulos, MD

COPENHAGEN—The combination of daratumumab, lenalidomide, and dexamethasone (DRd) could become a new standard of care for patients with relapsed or refractory multiple myeloma (MM), according to a speaker at the 21st Congress of the European Hematology Association.

In the phase 3 POLLUX study, DRd conferred the highest response rate reported to date in the treatment of relapsed/refractory MM.

DRd also significantly improved progression free survival (PFS) when compared to treatment with lenalidomide and dexamethasone (Rd).

In addition, the safety profile of DRd was manageable and consistent with results observed in previous studies, according to Meletios A. Dimopoulos, MD, of the National and Kapodistrian University of Athens in Greece.

Dr Dimopoulos presented these results at the congress as abstract LB2238. The POLLUX study was funded by Janssen Research & Development, LLC.

Treatment and patients

POLLUX was a randomized, double-blind study that enrolled 569 patients with relapsed or refractory MM. Patients had received 1 or more prior lines of therapy and had progressive disease.

The patients were randomized to receive DRd (n=286) or Rd (n=283). All patients received lenalidomide at 25 mg on days 1-21 of each cycle until disease progression. They also received dexamethasone at 40 mg weekly until disease progression.

Patients in the daratumumab arm also received daratumumab at 16 mg/kg once a week in cycles 1-2, every other week in cycles 3-6, and once every 4 weeks until disease progression.

Dr Dimopoulos noted that patient and disease features were equally distributed between the treatment arms. The median age was 65 in both arms (overall range, 34-89). About half of patients in each arm had ISS stage I disease, and patients were, roughly, a median of 4 years from diagnosis.

In both arms, patients had a median of 1 prior lines of therapy (overall range, 1-11). Roughly 60% of patients in both arms had received a prior transplant, 86% had received a proteasome inhibitor, 55% had received an immunomodulatory agent, 18% had prior lenalidomide, and 44% had received a proteasome inhibitor and an immunomodulatory agent.

Roughly 28% of patients in each arm were refractory to a proteasome inhibitor, and nearly 30% were refractory to their last line of therapy.

Results

At a median follow-up of 13.5 months, about 35% of patients had discontinued treatment—23% in the DRd arm and 47% in the Rd arm.

Reasons for discontinuation included disease progression (14% and 34%, respectively), adverse events (7% and 8%, respectively), non-compliance with study drug (0.4% and 2%, respectively), withdrawal by patient (0.4% and 2%, respectively), physician decision (1% and 0.7%, respectively), and death (0.7% and 0.4%, respectively).

The study’s primary endpoint was PFS. The median PFS has not been reached in the DRd arm and was 18.4 months in the Rd arm. The 12-month PFS was 83% and 60%, respectively, and the 18-month PFS was 78% and 52%, respectively.

“There is an unprecedented improvement of progression-free survival in favor of daratumumab with lenalidomide and dexamethasone, with a hazard ratio of 0.37 [95% CI, 0.27-0.52; P<0.0001], which corresponds to a 63% reduction in the risk of progressive disease or death in favor of DRd,” Dr Dimopoulos said.

He also pointed out that the improvement in PFS for the DRd arm was seen across all patient subgroups, regardless of age, ISS stage, prior treatment, and type of MM.

Furthermore, response rates were significantly higher in the DRd arm than in the Rd arm. The overall response rates were 93% and 76%, respectively (P<0.0001). And the complete response rates were 43% and 19%, respectively (P<0.0001).

“This trial was associated with the highest response ever reported—so far, at least—in the treatment of relapsed/refractory myeloma,” Dr Dimopoulos noted.

The median duration of response was not reached in the DRd arm and was 17.4 months in the Rd arm.

In addition, there was an overall survival advantage with DRd. The 18-month overall survival was 86% in the DRd arm and 76% in the Rd arm. The hazard ratio was 0.64 (95% CI, 0.40-1.01; P=0.0534).

As for safety, the most common hematologic adverse events (in the DRd and Rd arms, respectively) were neutropenia (59% and 43%), anemia (31% and 35%), thrombocytopenia (27% for both), lymphopenia (6% and 5%), and febrile neutropenia (6% and 3%).

The most common non-hematologic adverse events (in the DRd and Rd arms, respectively) were diarrhea (43% and 25%), fatigue (35% and 28%), upper respiratory tract infection (32% and 21%), constipation (29% and 25%), cough (29% and 13%), muscle spasms (26% and 19%), and pneumonia (14% and 13%).

“DRd has a manageable safety profile consistent with the known safety profile of daratumumab or Rd alone,” Dr Dimopoulos said. “And we believe the combination of daratumumab with lenalidomide and dexamethasone potentially represents a new standard of care for myeloma patients after 1 or more prior lines of therapy.”

Meletios A. Dimopoulos, MD

COPENHAGEN—The combination of daratumumab, lenalidomide, and dexamethasone (DRd) could become a new standard of care for patients with relapsed or refractory multiple myeloma (MM), according to a speaker at the 21st Congress of the European Hematology Association.

In the phase 3 POLLUX study, DRd conferred the highest response rate reported to date in the treatment of relapsed/refractory MM.

DRd also significantly improved progression free survival (PFS) when compared to treatment with lenalidomide and dexamethasone (Rd).

In addition, the safety profile of DRd was manageable and consistent with results observed in previous studies, according to Meletios A. Dimopoulos, MD, of the National and Kapodistrian University of Athens in Greece.

Dr Dimopoulos presented these results at the congress as abstract LB2238. The POLLUX study was funded by Janssen Research & Development, LLC.

Treatment and patients

POLLUX was a randomized, double-blind study that enrolled 569 patients with relapsed or refractory MM. Patients had received 1 or more prior lines of therapy and had progressive disease.

The patients were randomized to receive DRd (n=286) or Rd (n=283). All patients received lenalidomide at 25 mg on days 1-21 of each cycle until disease progression. They also received dexamethasone at 40 mg weekly until disease progression.

Patients in the daratumumab arm also received daratumumab at 16 mg/kg once a week in cycles 1-2, every other week in cycles 3-6, and once every 4 weeks until disease progression.

Dr Dimopoulos noted that patient and disease features were equally distributed between the treatment arms. The median age was 65 in both arms (overall range, 34-89). About half of patients in each arm had ISS stage I disease, and patients were, roughly, a median of 4 years from diagnosis.

In both arms, patients had a median of 1 prior lines of therapy (overall range, 1-11). Roughly 60% of patients in both arms had received a prior transplant, 86% had received a proteasome inhibitor, 55% had received an immunomodulatory agent, 18% had prior lenalidomide, and 44% had received a proteasome inhibitor and an immunomodulatory agent.

Roughly 28% of patients in each arm were refractory to a proteasome inhibitor, and nearly 30% were refractory to their last line of therapy.

Results

At a median follow-up of 13.5 months, about 35% of patients had discontinued treatment—23% in the DRd arm and 47% in the Rd arm.

Reasons for discontinuation included disease progression (14% and 34%, respectively), adverse events (7% and 8%, respectively), non-compliance with study drug (0.4% and 2%, respectively), withdrawal by patient (0.4% and 2%, respectively), physician decision (1% and 0.7%, respectively), and death (0.7% and 0.4%, respectively).

The study’s primary endpoint was PFS. The median PFS has not been reached in the DRd arm and was 18.4 months in the Rd arm. The 12-month PFS was 83% and 60%, respectively, and the 18-month PFS was 78% and 52%, respectively.

“There is an unprecedented improvement of progression-free survival in favor of daratumumab with lenalidomide and dexamethasone, with a hazard ratio of 0.37 [95% CI, 0.27-0.52; P<0.0001], which corresponds to a 63% reduction in the risk of progressive disease or death in favor of DRd,” Dr Dimopoulos said.

He also pointed out that the improvement in PFS for the DRd arm was seen across all patient subgroups, regardless of age, ISS stage, prior treatment, and type of MM.

Furthermore, response rates were significantly higher in the DRd arm than in the Rd arm. The overall response rates were 93% and 76%, respectively (P<0.0001). And the complete response rates were 43% and 19%, respectively (P<0.0001).

“This trial was associated with the highest response ever reported—so far, at least—in the treatment of relapsed/refractory myeloma,” Dr Dimopoulos noted.

The median duration of response was not reached in the DRd arm and was 17.4 months in the Rd arm.

In addition, there was an overall survival advantage with DRd. The 18-month overall survival was 86% in the DRd arm and 76% in the Rd arm. The hazard ratio was 0.64 (95% CI, 0.40-1.01; P=0.0534).

As for safety, the most common hematologic adverse events (in the DRd and Rd arms, respectively) were neutropenia (59% and 43%), anemia (31% and 35%), thrombocytopenia (27% for both), lymphopenia (6% and 5%), and febrile neutropenia (6% and 3%).

The most common non-hematologic adverse events (in the DRd and Rd arms, respectively) were diarrhea (43% and 25%), fatigue (35% and 28%), upper respiratory tract infection (32% and 21%), constipation (29% and 25%), cough (29% and 13%), muscle spasms (26% and 19%), and pneumonia (14% and 13%).

“DRd has a manageable safety profile consistent with the known safety profile of daratumumab or Rd alone,” Dr Dimopoulos said. “And we believe the combination of daratumumab with lenalidomide and dexamethasone potentially represents a new standard of care for myeloma patients after 1 or more prior lines of therapy.”

Hagop M. Kantarjian, MD
Photo courtesy of MDACC

In multiple categories, the antibody-drug conjuagate inotuzumab ozogamicin achieved significantly better results than the standard of care in the treatment of adults with acute lymphoblastic leukemia (ALL). 

Patients in the inotuzumab arm experienced a higher rate of complete remissions, a greater frequency of achieving minimal residual disease negativity, and longer progression-free survival and overall survival. 

However, veno-occlusive liver disease occurred more frequently in the inotuzumab-treated patients. 

Inotuzumab ozogamicin, an anti-CD22 antibody conjugated to calicheamicin, received breakthrough designation for ALL from the US Food and Drug Administration last October.

For this phase 3 trial, called INO-VATE, investigators randomized 326 patients to receive inotuzumab or the investigator’s choice of standard therapy. The first 218 patients, 109 in each arm, were included in the intent-to-treat analysis of complete remission.

Hagop M. Kantarjian, MD, of MD Anderson Cancer Center in Houston, Texas, presented the findings at the European Hematology Association meeting as abstract LB2233*. The study was simultaneously published in NEJM. Data cited here are based on the published paper.

Patients had to be 18 years of age or older and had to have relapsed or refractory disease with 5% or more blasts in the bone marrow. They had to be CD22-positive and could be either Philadelphia chromosome positive or negative. Patients had to be scheduled for their first or second salvage therapy. 

No cross-over between the groups was allowed.

The primary endpoints were complete remission including complete remission with incomplete hematologic recovery, and overall survival.

Treatments

Patients in the inotuzumab arm received the drug intravenously at a starting dose of 1.8 mg/m² per cycle for up to 6 cycles. Once a patient achieved complete remission or remission with incomplete hematologic recovery, the dose per cycle was reduced to 1.5 mg/m².

Patients in the standard therapy arm could receive one of three regimens: FLAG (fludarabine, cytarabine, and granulocyte colony-stimulating factor), cytarabine plus mitoxantrone, or high-dose cytarabine. These regimens were chosen because they are commonly used for the treatment of relapsed or refractory ALL.

Patient characteristics

Patients in both arms were a median age of 47, range 18 – 79. And a little more than a third in each arm were 55 or older. Most patients were white, and about half had an ECOG performance status of 1.

Almost three quarters of the patients in each arm had bone marrow blasts of 50% or more.

Results

Patients in the inotuzumab arm received a median of 3 cycles of therapy and those in the standard therapy arm received a median of 1 cycle. 

More patients in the inotuzumab arm received treatment for 2 or more cycles (73%) compared to the standard therapy arm (22%), a finding the investigators said was expected.

Dose reductions were more common in the inotuzumab arm (12%) compared with the standard therapy arm (3%). 

More inotuzumab-treated patients discontinued therapy due to achieving complete remission (35%) than in the standard arm (15%).

And fewer patients in the inotuzumab arm (10%) discontinued treatment because of resistant disease than in the standard arm (40%).

Efficacy

The rate of complete remission, including incomplete hematologic recovery, was significantly higher in the inotuzumab group (80.7%) than in the standard group (29.4%), P<0.001.

In both groups, patients who achieved complete remission, including those with incomplete hematologic recovery, did so at the end of cycle 1. 

"Standard chemotherapy regimens result in complete remission in 31 to 41 percent of patients who relapse earlier,” Dr Kantarjian noted, “and just 18 to 25 percent in those who relapse later." 

"Patients in the inotuzumab ozogamicin study,” he continued, “had remission rates of 58% higher than previously reported, possibly due to patients being treated later in the disease course."

Among the complete responders, significantly more patients achieved minimal residual disease (MRD) negativity in the inotuzumab arm (78.4%) than in the standard therapy group (28.1%), P<0.001.

The median duration of remission was 4.6 months in the inotuzumab arm and 3.1 months in the standard therapy group, P=0.03.

And more patients treated with inotuzumab (41%) proceeded to stem cell transplant directly after treatment than in the standard therapy group (11%), P<0.001.

"Given that stem cell transplant is considered the only curative treatment option,” Dr Kantarjian said, “the ability of inotuzumab ozogamicin to increase the number of patients able to bridge to transplant is encouraging."

Survival

The intention-to-treat survival analysis included 164 patients in the inotuzumab arm and 162 in the standard therapy arm.

Progression-free survival (PFS) was significantly longer in the inotuzumab arm than in the standard therapy arm, a median of 5.0 months compared to 1.8 months, respectively, P<0.001.

The second primary objective of longer overall survival at the prespecified boundary of P=0.0208 was not met. Median overall survival was 7.7 months in the inotuzumab arm and 6.7 months in the standard therapy group, P=0.04.

Safety

In both treatment groups, the most common hematologic adverse events of any cause occurring during treatment were cytopenias.

Thrombocytopenia of grade 3 or higher was lower in the inotuzumab arm (37%) than in the standard therapy arm (59%).

Febrile neutropenia of grade 3 or higher occurred in 24% of inotuzumab-treated patients compared with 49% of patients in the standard therapy group. 

In the inotuzumab group, the most common non-hematologic adverse events of any grade included nausea (32%), headache (28%), and pyrexia (27%). Grade 3 or higher nausea, headache, and pyrexia occurred in 2%, 1%, and 4%, respectively.

In the standard therapy arm, the most common non-hematologic events of any grade included nausea (47%), pyrexia (43%), and diarrhea (40%). Grade 3 or higher nausea, pyrexia, and diarrhea occurred in 0%, 5%, and 1%, respectively. 

Febrile neutropenia was the most frequently reported serious adverse event, occurring in 12% of the inotuzumab-treated patients and 18% in the standard therapy group.

And liver-related adverse events were more common in the inotuzumab arm. 

The most frequent liver-related adverse event of any grade was increased aspartate aminotransferase level, 20% in the inotuzumab group and 10% in the standard therapy group, hyperbilirubinemia, 15% and 10%, respectively, and increased alanine aminotransferase level, 14% and 11%, respectively. 

Veno-occlusive liver disease (VOD) occurred more frequently with inotuzumab (11%, 15 patients) compared with standard therapy (1%, 1 patient). And cases were reported up to 2 years after randomization. 

Five of the 15 patients developed VOD during or shortly after inotuzumab treatment. No cases of VOD occurred during the administration of standard therapy. 

Seventeen deaths occurred during treatment in the inotuzumab arm and 11 in the standard therapy arm. Four deaths in the inotuzumab group and 2 in the standard therapy group were believed to be treatment-related. 

The study was funded by Pfizer.

*Data in the abstract differ from those published in NEJM.

Hagop M. Kantarjian, MD
Photo courtesy of MDACC

In multiple categories, the antibody-drug conjuagate inotuzumab ozogamicin achieved significantly better results than the standard of care in the treatment of adults with acute lymphoblastic leukemia (ALL). 

Patients in the inotuzumab arm experienced a higher rate of complete remissions, a greater frequency of achieving minimal residual disease negativity, and longer progression-free survival and overall survival. 

However, veno-occlusive liver disease occurred more frequently in the inotuzumab-treated patients. 

Inotuzumab ozogamicin, an anti-CD22 antibody conjugated to calicheamicin, received breakthrough designation for ALL from the US Food and Drug Administration last October.

For this phase 3 trial, called INO-VATE, investigators randomized 326 patients to receive inotuzumab or the investigator’s choice of standard therapy. The first 218 patients, 109 in each arm, were included in the intent-to-treat analysis of complete remission.

Hagop M. Kantarjian, MD, of MD Anderson Cancer Center in Houston, Texas, presented the findings at the European Hematology Association meeting as abstract LB2233*. The study was simultaneously published in NEJM. Data cited here are based on the published paper.

Patients had to be 18 years of age or older and had to have relapsed or refractory disease with 5% or more blasts in the bone marrow. They had to be CD22-positive and could be either Philadelphia chromosome positive or negative. Patients had to be scheduled for their first or second salvage therapy. 

No cross-over between the groups was allowed.

The primary endpoints were complete remission including complete remission with incomplete hematologic recovery, and overall survival.

Treatments

Patients in the inotuzumab arm received the drug intravenously at a starting dose of 1.8 mg/m² per cycle for up to 6 cycles. Once a patient achieved complete remission or remission with incomplete hematologic recovery, the dose per cycle was reduced to 1.5 mg/m².

Patients in the standard therapy arm could receive one of three regimens: FLAG (fludarabine, cytarabine, and granulocyte colony-stimulating factor), cytarabine plus mitoxantrone, or high-dose cytarabine. These regimens were chosen because they are commonly used for the treatment of relapsed or refractory ALL.

Patient characteristics

Patients in both arms were a median age of 47, range 18 – 79. And a little more than a third in each arm were 55 or older. Most patients were white, and about half had an ECOG performance status of 1.

Almost three quarters of the patients in each arm had bone marrow blasts of 50% or more.

Results

Patients in the inotuzumab arm received a median of 3 cycles of therapy and those in the standard therapy arm received a median of 1 cycle. 

More patients in the inotuzumab arm received treatment for 2 or more cycles (73%) compared to the standard therapy arm (22%), a finding the investigators said was expected.

Dose reductions were more common in the inotuzumab arm (12%) compared with the standard therapy arm (3%). 

More inotuzumab-treated patients discontinued therapy due to achieving complete remission (35%) than in the standard arm (15%).

And fewer patients in the inotuzumab arm (10%) discontinued treatment because of resistant disease than in the standard arm (40%).

Efficacy

The rate of complete remission, including incomplete hematologic recovery, was significantly higher in the inotuzumab group (80.7%) than in the standard group (29.4%), P<0.001.

In both groups, patients who achieved complete remission, including those with incomplete hematologic recovery, did so at the end of cycle 1. 

"Standard chemotherapy regimens result in complete remission in 31 to 41 percent of patients who relapse earlier,” Dr Kantarjian noted, “and just 18 to 25 percent in those who relapse later." 

"Patients in the inotuzumab ozogamicin study,” he continued, “had remission rates of 58% higher than previously reported, possibly due to patients being treated later in the disease course."

Among the complete responders, significantly more patients achieved minimal residual disease (MRD) negativity in the inotuzumab arm (78.4%) than in the standard therapy group (28.1%), P<0.001.

The median duration of remission was 4.6 months in the inotuzumab arm and 3.1 months in the standard therapy group, P=0.03.

And more patients treated with inotuzumab (41%) proceeded to stem cell transplant directly after treatment than in the standard therapy group (11%), P<0.001.

"Given that stem cell transplant is considered the only curative treatment option,” Dr Kantarjian said, “the ability of inotuzumab ozogamicin to increase the number of patients able to bridge to transplant is encouraging."

Survival

The intention-to-treat survival analysis included 164 patients in the inotuzumab arm and 162 in the standard therapy arm.

Progression-free survival (PFS) was significantly longer in the inotuzumab arm than in the standard therapy arm, a median of 5.0 months compared to 1.8 months, respectively, P<0.001.

The second primary objective of longer overall survival at the prespecified boundary of P=0.0208 was not met. Median overall survival was 7.7 months in the inotuzumab arm and 6.7 months in the standard therapy group, P=0.04.

Safety

In both treatment groups, the most common hematologic adverse events of any cause occurring during treatment were cytopenias.

Thrombocytopenia of grade 3 or higher was lower in the inotuzumab arm (37%) than in the standard therapy arm (59%).

Febrile neutropenia of grade 3 or higher occurred in 24% of inotuzumab-treated patients compared with 49% of patients in the standard therapy group. 

In the inotuzumab group, the most common non-hematologic adverse events of any grade included nausea (32%), headache (28%), and pyrexia (27%). Grade 3 or higher nausea, headache, and pyrexia occurred in 2%, 1%, and 4%, respectively.

In the standard therapy arm, the most common non-hematologic events of any grade included nausea (47%), pyrexia (43%), and diarrhea (40%). Grade 3 or higher nausea, pyrexia, and diarrhea occurred in 0%, 5%, and 1%, respectively. 

Febrile neutropenia was the most frequently reported serious adverse event, occurring in 12% of the inotuzumab-treated patients and 18% in the standard therapy group.

And liver-related adverse events were more common in the inotuzumab arm. 

The most frequent liver-related adverse event of any grade was increased aspartate aminotransferase level, 20% in the inotuzumab group and 10% in the standard therapy group, hyperbilirubinemia, 15% and 10%, respectively, and increased alanine aminotransferase level, 14% and 11%, respectively. 

Veno-occlusive liver disease (VOD) occurred more frequently with inotuzumab (11%, 15 patients) compared with standard therapy (1%, 1 patient). And cases were reported up to 2 years after randomization. 

Five of the 15 patients developed VOD during or shortly after inotuzumab treatment. No cases of VOD occurred during the administration of standard therapy. 

Seventeen deaths occurred during treatment in the inotuzumab arm and 11 in the standard therapy arm. Four deaths in the inotuzumab group and 2 in the standard therapy group were believed to be treatment-related. 

The study was funded by Pfizer.

*Data in the abstract differ from those published in NEJM.

Hagop M. Kantarjian, MD
Photo courtesy of MDACC

In multiple categories, the antibody-drug conjuagate inotuzumab ozogamicin achieved significantly better results than the standard of care in the treatment of adults with acute lymphoblastic leukemia (ALL). 

Patients in the inotuzumab arm experienced a higher rate of complete remissions, a greater frequency of achieving minimal residual disease negativity, and longer progression-free survival and overall survival. 

However, veno-occlusive liver disease occurred more frequently in the inotuzumab-treated patients. 

Inotuzumab ozogamicin, an anti-CD22 antibody conjugated to calicheamicin, received breakthrough designation for ALL from the US Food and Drug Administration last October.

For this phase 3 trial, called INO-VATE, investigators randomized 326 patients to receive inotuzumab or the investigator’s choice of standard therapy. The first 218 patients, 109 in each arm, were included in the intent-to-treat analysis of complete remission.

Hagop M. Kantarjian, MD, of MD Anderson Cancer Center in Houston, Texas, presented the findings at the European Hematology Association meeting as abstract LB2233*. The study was simultaneously published in NEJM. Data cited here are based on the published paper.

Patients had to be 18 years of age or older and had to have relapsed or refractory disease with 5% or more blasts in the bone marrow. They had to be CD22-positive and could be either Philadelphia chromosome positive or negative. Patients had to be scheduled for their first or second salvage therapy. 

No cross-over between the groups was allowed.

The primary endpoints were complete remission including complete remission with incomplete hematologic recovery, and overall survival.

Treatments

Patients in the inotuzumab arm received the drug intravenously at a starting dose of 1.8 mg/m² per cycle for up to 6 cycles. Once a patient achieved complete remission or remission with incomplete hematologic recovery, the dose per cycle was reduced to 1.5 mg/m².

Patients in the standard therapy arm could receive one of three regimens: FLAG (fludarabine, cytarabine, and granulocyte colony-stimulating factor), cytarabine plus mitoxantrone, or high-dose cytarabine. These regimens were chosen because they are commonly used for the treatment of relapsed or refractory ALL.

Patient characteristics

Patients in both arms were a median age of 47, range 18 – 79. And a little more than a third in each arm were 55 or older. Most patients were white, and about half had an ECOG performance status of 1.

Almost three quarters of the patients in each arm had bone marrow blasts of 50% or more.

Results

Patients in the inotuzumab arm received a median of 3 cycles of therapy and those in the standard therapy arm received a median of 1 cycle. 

More patients in the inotuzumab arm received treatment for 2 or more cycles (73%) compared to the standard therapy arm (22%), a finding the investigators said was expected.

Dose reductions were more common in the inotuzumab arm (12%) compared with the standard therapy arm (3%). 

More inotuzumab-treated patients discontinued therapy due to achieving complete remission (35%) than in the standard arm (15%).

And fewer patients in the inotuzumab arm (10%) discontinued treatment because of resistant disease than in the standard arm (40%).

Efficacy

The rate of complete remission, including incomplete hematologic recovery, was significantly higher in the inotuzumab group (80.7%) than in the standard group (29.4%), P<0.001.

In both groups, patients who achieved complete remission, including those with incomplete hematologic recovery, did so at the end of cycle 1. 

"Standard chemotherapy regimens result in complete remission in 31 to 41 percent of patients who relapse earlier,” Dr Kantarjian noted, “and just 18 to 25 percent in those who relapse later." 

"Patients in the inotuzumab ozogamicin study,” he continued, “had remission rates of 58% higher than previously reported, possibly due to patients being treated later in the disease course."

Among the complete responders, significantly more patients achieved minimal residual disease (MRD) negativity in the inotuzumab arm (78.4%) than in the standard therapy group (28.1%), P<0.001.

The median duration of remission was 4.6 months in the inotuzumab arm and 3.1 months in the standard therapy group, P=0.03.

And more patients treated with inotuzumab (41%) proceeded to stem cell transplant directly after treatment than in the standard therapy group (11%), P<0.001.

"Given that stem cell transplant is considered the only curative treatment option,” Dr Kantarjian said, “the ability of inotuzumab ozogamicin to increase the number of patients able to bridge to transplant is encouraging."

Survival

The intention-to-treat survival analysis included 164 patients in the inotuzumab arm and 162 in the standard therapy arm.

Progression-free survival (PFS) was significantly longer in the inotuzumab arm than in the standard therapy arm, a median of 5.0 months compared to 1.8 months, respectively, P<0.001.

The second primary objective of longer overall survival at the prespecified boundary of P=0.0208 was not met. Median overall survival was 7.7 months in the inotuzumab arm and 6.7 months in the standard therapy group, P=0.04.

Safety

In both treatment groups, the most common hematologic adverse events of any cause occurring during treatment were cytopenias.

Thrombocytopenia of grade 3 or higher was lower in the inotuzumab arm (37%) than in the standard therapy arm (59%).

Febrile neutropenia of grade 3 or higher occurred in 24% of inotuzumab-treated patients compared with 49% of patients in the standard therapy group. 

In the inotuzumab group, the most common non-hematologic adverse events of any grade included nausea (32%), headache (28%), and pyrexia (27%). Grade 3 or higher nausea, headache, and pyrexia occurred in 2%, 1%, and 4%, respectively.

In the standard therapy arm, the most common non-hematologic events of any grade included nausea (47%), pyrexia (43%), and diarrhea (40%). Grade 3 or higher nausea, pyrexia, and diarrhea occurred in 0%, 5%, and 1%, respectively. 

Febrile neutropenia was the most frequently reported serious adverse event, occurring in 12% of the inotuzumab-treated patients and 18% in the standard therapy group.

And liver-related adverse events were more common in the inotuzumab arm. 

The most frequent liver-related adverse event of any grade was increased aspartate aminotransferase level, 20% in the inotuzumab group and 10% in the standard therapy group, hyperbilirubinemia, 15% and 10%, respectively, and increased alanine aminotransferase level, 14% and 11%, respectively. 

Veno-occlusive liver disease (VOD) occurred more frequently with inotuzumab (11%, 15 patients) compared with standard therapy (1%, 1 patient). And cases were reported up to 2 years after randomization. 

Five of the 15 patients developed VOD during or shortly after inotuzumab treatment. No cases of VOD occurred during the administration of standard therapy. 

Seventeen deaths occurred during treatment in the inotuzumab arm and 11 in the standard therapy arm. Four deaths in the inotuzumab group and 2 in the standard therapy group were believed to be treatment-related. 

The study was funded by Pfizer.

*Data in the abstract differ from those published in NEJM.

Copenhagen – Among older adults with acute myeloid leukemia, the combination of a drug-antibody conjugate and hypomethylating therapy was associated with high complete remission rates.

In a phase I study of 53 patients (median age 75 years) with AML, the combination of vadastuximab talirine and a hypomethylating agent (HMA), either azacitidine or decitabine, was associated in 49 efficacy-evaluable patients with a 71% rate of composite complete remission (CR) and complete remission with incomplete recovery of counts (CRi), reported Dr. Amir Fathi from the Massachusetts General Hospital Cancer Center in Boston.

“This high remission rate in this traditionally high risk group and difficult to treat population is very compelling. Response rates were higher, and were achieved more quickly than would be expected from historical data associated with HMA therapy alone,” he said at a briefing at the annual congress of the European Hematology Association.

Many older patients with AML may not be able to withstand the rigors of cytotoxic chemotherapy, and these patients are often treated with hypomethylating agents or other low-intensity therapies, Dr. Fathi said.

Vadastuximab talirine is an antibody-drug conjugate designed to deliver a cytotoxic agent to myeloid leukemia cells, and in preclinical studies has been shown to enhance the cytotoxic effects of HMAs when given in combination.

Dr. Fathi reported preliminary data on 53 patients enrolled in a phase 1 study of the safety, tolerability, pharmacokinetics, and antileukemic activity of vadastuximab in combination with an HMA.

Neil Osterweil/Frontline Medical News

They enrolled adults with good performance status (Eastern Cooperative Oncology Group 0 or 1) who had CD33-positive AML and had declined intensive chemotherapy. They were given vadastuximab 10 mg/kg in an outpatient intravenous basis every 4 weeks on the fifth day of a 5-day HMA regimen,

Patients who were observed to have a clinical benefit could continue on treatment until relapse or unacceptable toxicity.

Of the 53 patients enrolled, 19 had adverse cytogenetic risk, and 30 had intermediate risk. The majority of patients (48) had not previously been treated for AML, and 5 had received prior low-intensity therapy for the myelodysplastic syndrome.

A total of 49 patients had sufficient data for the efficacy evaluation, and among these patients the composite CR/CRi rate was 71%; the rates of CR/CRi were similar whether the partner HMA was azacitadine or decitabine.

The overall response rate was 76%, with responses seem among higher-risk patients, including remissions in 16 of 22 patients with underlying myelodysplasia, and in 15 of 18 patients with adverse cytogenetics.

In addition, 8 of 19 patients with a CR, and 5 of 15 with a CRi met the definition for minimal residual disease.

Dr. Fathi reported early overall survival results, which he noted were still evolving. The estimated median overall survival for the first 25 patients enrolled in the study was 12.75 months after a median follow-up of 12.58 months.

The median relapse free-survival was 7.7 months. As of last follow-up, 27 patients were alive and remained on study.

The 30-day mortality rate was 2%, and the 60-day rate was 8%.

The most common treatment-related adverse events of any grade occurring in 20% or more of patients were fatigue, thrombocytopenia, nausea, febrile neutropenia, constipation, and anemia

The most common grade 3 or greater treatment-emergent adverse events were febrile neutropenia, thrombocytopenia, neutropenia, anemia, and fatigue.

In an interview, Dr. Fathi said that he has been very encouraged by the results thus far.

“This is a traditionally high-risk patient population. Even with a conventional induction cytotoxic chemotherapy, rates of remission in this population are relatively lower, so if the remission rates pan out in a larger population, I would say it competes and possibly supersedes what you would expect in an older population,” Dr. Fathi said.

Asked whether it might be possible to boost outcomes further with additional therapies, he said that “I’m not sure if there is much more improvement over what we are already seeing; a rate of 70-something percent among older adults with AML is quite good.”

“I like this ‘Trojan-horse’ approach to treating AML,” commented Dr. Anton Hagenbeek, professor of hematology at the Academic Medical Center, University of Amsterdam, who moderated the briefing.

A randomized phase III trial of vadastuximab talirine and HMA therapy is currently enrolling patients.

The study was funded by Seattle Genetics. Dr. Fathi reported no relevant disclosures.

Copenhagen – Among older adults with acute myeloid leukemia, the combination of a drug-antibody conjugate and hypomethylating therapy was associated with high complete remission rates.

In a phase I study of 53 patients (median age 75 years) with AML, the combination of vadastuximab talirine and a hypomethylating agent (HMA), either azacitidine or decitabine, was associated in 49 efficacy-evaluable patients with a 71% rate of composite complete remission (CR) and complete remission with incomplete recovery of counts (CRi), reported Dr. Amir Fathi from the Massachusetts General Hospital Cancer Center in Boston.

“This high remission rate in this traditionally high risk group and difficult to treat population is very compelling. Response rates were higher, and were achieved more quickly than would be expected from historical data associated with HMA therapy alone,” he said at a briefing at the annual congress of the European Hematology Association.

Many older patients with AML may not be able to withstand the rigors of cytotoxic chemotherapy, and these patients are often treated with hypomethylating agents or other low-intensity therapies, Dr. Fathi said.

Vadastuximab talirine is an antibody-drug conjugate designed to deliver a cytotoxic agent to myeloid leukemia cells, and in preclinical studies has been shown to enhance the cytotoxic effects of HMAs when given in combination.

Dr. Fathi reported preliminary data on 53 patients enrolled in a phase 1 study of the safety, tolerability, pharmacokinetics, and antileukemic activity of vadastuximab in combination with an HMA.

Neil Osterweil/Frontline Medical News

They enrolled adults with good performance status (Eastern Cooperative Oncology Group 0 or 1) who had CD33-positive AML and had declined intensive chemotherapy. They were given vadastuximab 10 mg/kg in an outpatient intravenous basis every 4 weeks on the fifth day of a 5-day HMA regimen,

Patients who were observed to have a clinical benefit could continue on treatment until relapse or unacceptable toxicity.

Of the 53 patients enrolled, 19 had adverse cytogenetic risk, and 30 had intermediate risk. The majority of patients (48) had not previously been treated for AML, and 5 had received prior low-intensity therapy for the myelodysplastic syndrome.

A total of 49 patients had sufficient data for the efficacy evaluation, and among these patients the composite CR/CRi rate was 71%; the rates of CR/CRi were similar whether the partner HMA was azacitadine or decitabine.

The overall response rate was 76%, with responses seem among higher-risk patients, including remissions in 16 of 22 patients with underlying myelodysplasia, and in 15 of 18 patients with adverse cytogenetics.

In addition, 8 of 19 patients with a CR, and 5 of 15 with a CRi met the definition for minimal residual disease.

Dr. Fathi reported early overall survival results, which he noted were still evolving. The estimated median overall survival for the first 25 patients enrolled in the study was 12.75 months after a median follow-up of 12.58 months.

The median relapse free-survival was 7.7 months. As of last follow-up, 27 patients were alive and remained on study.

The 30-day mortality rate was 2%, and the 60-day rate was 8%.

The most common treatment-related adverse events of any grade occurring in 20% or more of patients were fatigue, thrombocytopenia, nausea, febrile neutropenia, constipation, and anemia

The most common grade 3 or greater treatment-emergent adverse events were febrile neutropenia, thrombocytopenia, neutropenia, anemia, and fatigue.

In an interview, Dr. Fathi said that he has been very encouraged by the results thus far.

“This is a traditionally high-risk patient population. Even with a conventional induction cytotoxic chemotherapy, rates of remission in this population are relatively lower, so if the remission rates pan out in a larger population, I would say it competes and possibly supersedes what you would expect in an older population,” Dr. Fathi said.

Asked whether it might be possible to boost outcomes further with additional therapies, he said that “I’m not sure if there is much more improvement over what we are already seeing; a rate of 70-something percent among older adults with AML is quite good.”

“I like this ‘Trojan-horse’ approach to treating AML,” commented Dr. Anton Hagenbeek, professor of hematology at the Academic Medical Center, University of Amsterdam, who moderated the briefing.

A randomized phase III trial of vadastuximab talirine and HMA therapy is currently enrolling patients.

The study was funded by Seattle Genetics. Dr. Fathi reported no relevant disclosures.

Copenhagen – Among older adults with acute myeloid leukemia, the combination of a drug-antibody conjugate and hypomethylating therapy was associated with high complete remission rates.

In a phase I study of 53 patients (median age 75 years) with AML, the combination of vadastuximab talirine and a hypomethylating agent (HMA), either azacitidine or decitabine, was associated in 49 efficacy-evaluable patients with a 71% rate of composite complete remission (CR) and complete remission with incomplete recovery of counts (CRi), reported Dr. Amir Fathi from the Massachusetts General Hospital Cancer Center in Boston.

“This high remission rate in this traditionally high risk group and difficult to treat population is very compelling. Response rates were higher, and were achieved more quickly than would be expected from historical data associated with HMA therapy alone,” he said at a briefing at the annual congress of the European Hematology Association.

Many older patients with AML may not be able to withstand the rigors of cytotoxic chemotherapy, and these patients are often treated with hypomethylating agents or other low-intensity therapies, Dr. Fathi said.

Vadastuximab talirine is an antibody-drug conjugate designed to deliver a cytotoxic agent to myeloid leukemia cells, and in preclinical studies has been shown to enhance the cytotoxic effects of HMAs when given in combination.

Dr. Fathi reported preliminary data on 53 patients enrolled in a phase 1 study of the safety, tolerability, pharmacokinetics, and antileukemic activity of vadastuximab in combination with an HMA.

Neil Osterweil/Frontline Medical News

They enrolled adults with good performance status (Eastern Cooperative Oncology Group 0 or 1) who had CD33-positive AML and had declined intensive chemotherapy. They were given vadastuximab 10 mg/kg in an outpatient intravenous basis every 4 weeks on the fifth day of a 5-day HMA regimen,

Patients who were observed to have a clinical benefit could continue on treatment until relapse or unacceptable toxicity.

Of the 53 patients enrolled, 19 had adverse cytogenetic risk, and 30 had intermediate risk. The majority of patients (48) had not previously been treated for AML, and 5 had received prior low-intensity therapy for the myelodysplastic syndrome.

A total of 49 patients had sufficient data for the efficacy evaluation, and among these patients the composite CR/CRi rate was 71%; the rates of CR/CRi were similar whether the partner HMA was azacitadine or decitabine.

The overall response rate was 76%, with responses seem among higher-risk patients, including remissions in 16 of 22 patients with underlying myelodysplasia, and in 15 of 18 patients with adverse cytogenetics.

In addition, 8 of 19 patients with a CR, and 5 of 15 with a CRi met the definition for minimal residual disease.

Dr. Fathi reported early overall survival results, which he noted were still evolving. The estimated median overall survival for the first 25 patients enrolled in the study was 12.75 months after a median follow-up of 12.58 months.

The median relapse free-survival was 7.7 months. As of last follow-up, 27 patients were alive and remained on study.

The 30-day mortality rate was 2%, and the 60-day rate was 8%.

The most common treatment-related adverse events of any grade occurring in 20% or more of patients were fatigue, thrombocytopenia, nausea, febrile neutropenia, constipation, and anemia

The most common grade 3 or greater treatment-emergent adverse events were febrile neutropenia, thrombocytopenia, neutropenia, anemia, and fatigue.

In an interview, Dr. Fathi said that he has been very encouraged by the results thus far.

“This is a traditionally high-risk patient population. Even with a conventional induction cytotoxic chemotherapy, rates of remission in this population are relatively lower, so if the remission rates pan out in a larger population, I would say it competes and possibly supersedes what you would expect in an older population,” Dr. Fathi said.

Asked whether it might be possible to boost outcomes further with additional therapies, he said that “I’m not sure if there is much more improvement over what we are already seeing; a rate of 70-something percent among older adults with AML is quite good.”

“I like this ‘Trojan-horse’ approach to treating AML,” commented Dr. Anton Hagenbeek, professor of hematology at the Academic Medical Center, University of Amsterdam, who moderated the briefing.

A randomized phase III trial of vadastuximab talirine and HMA therapy is currently enrolling patients.

The study was funded by Seattle Genetics. Dr. Fathi reported no relevant disclosures.

Copenhagen – The experimental antibody-drug conjugate inotuzumab ozogamicin was associated with a nearly threefold higher complete remission rate than standard intensive chemotherapy in patients with relapsed/refractory acute lymphoblastic leukemia, investigators reported.

Among 218 patients in a phase III clinical trial, rates of combined complete remissions (CR) and complete remission with incomplete recovery of counts (CRi) were 80.7% for patients randomly assigned to receive the anti-CD22 conjugated antibody inotuzumab ozogamicin, compared with 29.4% for patients assigned to receive a standard intensive chemotherapy regimen chosen by investigators (P less than .001).

In addition, among patients who had complete remissions in both groups, significantly more patients in the inotuzumab ozogamicin group had fewer than .01% marrow blasts, a level below the threshold for minimal residual disease (MRD) (78.4% vs. 28.1%, respectively, P less than .001), reported Dr. Hagop Kantarjian, professor in the department of leukemia at the University of Texas MD Anderson Cancer Center, Houston.

“In my opinion, inotuzumab is well tolerated with appropriate prevention measures, and my hope is that soon in the future, inotuzumab will be used not as a single agent, but in combination with chemotherapy or with other monoclonal antibodies targeting CD19,” he said at the annual congress of the European Hematology Association.

Inotuzumab ozogamicin is an anti-CD22 monoclonal antibody conjugated to calicheamicin, a cytotoxic antibiotic.  CD22 is expressed on the surface of about 90% of B-cell ALL cells.

Dr. Daniel DeAngelo from the Dana-Farber Cancer Institute in Boston reported that in the same cohort of patients, the first 218 of 326 randomized in the INO-VATE trial, , the co-primary endpoint of CR/CRi by independent review was achieved by 80.7% of patients treated with inotuzumab and 33.3% treated with standard of care.The updated data presented at the meeting also are published online in the New England Journal of Medicine 2016 June doi:10.1056/NEJMoa1509277 .

The phase III trial randomized 326 patients with relapsed/refractory CD22-positive ALL due for salvage 1 or 2 therapy to inotuzumab or standard of care, consisting of either the FLAG regimen (fludarabine (Fludara)/cytarabine (Ara-C)/granulocyte colony-stimulating factor), Ara-C plus mitoxantrone (Novantrone), or high-dose Ara-C. The starting dose for inotuzumab was 1.8 mg/m²/cycle and was reduced to 1.5 mg/m²/cycle once a CR or CRi was achieved. Patients were stratified by duration of first remission, salvage 1 or 2, and age.

The first 218 randomized patients were included in the intention-to-treat CR/CRi analysis, which was modified after excluding 13 patients who refused to start treatment, all in the standard-of-care arm.

The patients’ median age was 47 years (ranging up to 79 years), two-thirds were in salvage 1, and more than half had a remission duration of less than 12 months, an adverse prognostic feature.

Dr. Kantarjian reported that in addition to the superior remission rates seen with inotuzumab ozogamicin, patients on the antibody-drug conjugate had significantly longer duration of remissions, at a median of 4.6 months vs. 3.1 months for patients on chemotherapy (P = .003).

An intention-to-treat survival analysis including all 326 patients randomized in the trial showed that progression-free survival was significantly longer in the inotuzumab ozogamicin group, at a median of 5.0 vs. 1.8 months (hazard ratio .45 P less than .001).

Neil Osterweil/Frontline Medical News

Overall survival was slightly better with inotuzumab, at a median of 7.7 months vs. 6.7 months, but this did not meet the study definition of significantly improved overall survival with a pre-specified boundary of P = .014 or lower.

In the safety population, which included 139 patients assigned to inotuzumab and 120 to chemotherapy who had received at least one dose of the assigned regimen before data cutoff, the most frequent grade 3 or higher non-hematologic adverse events with inotuzumab ozogamicin were liver-related. In all, 13% of patients assigned to inotuzumab in the safety population developed veno-occlusive liver disease of any grade, compared with 1% of those assigned to standard of care.

“This drug showed consistently high activity in several studies, so I think it’s very exciting, The real challenge will be how to proceed, how to incorporate it into clinical trials both in pediatrics and adults,” commented Dr. Shai Izraeli, head of the section of functional genomics and childhood leukemia and cancer research at Sheba Medical Center in Ramat Gan, Israel. Dr. Izraeli was co-moderator of the late-breaking abstract session where the data were presented, but was not involved in the study.

He said in an interview that the challenge for investigators will be to develop clinical trials that combine this agent with different immunotherapies from different companies, which would be a logistical nightmare, “but I think we need to do it.”

The study was funded by Pfizer. Dr. Kantarjian disclosed research support from the company. Dr. Izraeli reported having no relevant disclosures.

Copenhagen – The experimental antibody-drug conjugate inotuzumab ozogamicin was associated with a nearly threefold higher complete remission rate than standard intensive chemotherapy in patients with relapsed/refractory acute lymphoblastic leukemia, investigators reported.

Among 218 patients in a phase III clinical trial, rates of combined complete remissions (CR) and complete remission with incomplete recovery of counts (CRi) were 80.7% for patients randomly assigned to receive the anti-CD22 conjugated antibody inotuzumab ozogamicin, compared with 29.4% for patients assigned to receive a standard intensive chemotherapy regimen chosen by investigators (P less than .001).

In addition, among patients who had complete remissions in both groups, significantly more patients in the inotuzumab ozogamicin group had fewer than .01% marrow blasts, a level below the threshold for minimal residual disease (MRD) (78.4% vs. 28.1%, respectively, P less than .001), reported Dr. Hagop Kantarjian, professor in the department of leukemia at the University of Texas MD Anderson Cancer Center, Houston.

“In my opinion, inotuzumab is well tolerated with appropriate prevention measures, and my hope is that soon in the future, inotuzumab will be used not as a single agent, but in combination with chemotherapy or with other monoclonal antibodies targeting CD19,” he said at the annual congress of the European Hematology Association.

Inotuzumab ozogamicin is an anti-CD22 monoclonal antibody conjugated to calicheamicin, a cytotoxic antibiotic.  CD22 is expressed on the surface of about 90% of B-cell ALL cells.

Dr. Daniel DeAngelo from the Dana-Farber Cancer Institute in Boston reported that in the same cohort of patients, the first 218 of 326 randomized in the INO-VATE trial, , the co-primary endpoint of CR/CRi by independent review was achieved by 80.7% of patients treated with inotuzumab and 33.3% treated with standard of care.The updated data presented at the meeting also are published online in the New England Journal of Medicine 2016 June doi:10.1056/NEJMoa1509277 .

The phase III trial randomized 326 patients with relapsed/refractory CD22-positive ALL due for salvage 1 or 2 therapy to inotuzumab or standard of care, consisting of either the FLAG regimen (fludarabine (Fludara)/cytarabine (Ara-C)/granulocyte colony-stimulating factor), Ara-C plus mitoxantrone (Novantrone), or high-dose Ara-C. The starting dose for inotuzumab was 1.8 mg/m²/cycle and was reduced to 1.5 mg/m²/cycle once a CR or CRi was achieved. Patients were stratified by duration of first remission, salvage 1 or 2, and age.

The first 218 randomized patients were included in the intention-to-treat CR/CRi analysis, which was modified after excluding 13 patients who refused to start treatment, all in the standard-of-care arm.

The patients’ median age was 47 years (ranging up to 79 years), two-thirds were in salvage 1, and more than half had a remission duration of less than 12 months, an adverse prognostic feature.

Dr. Kantarjian reported that in addition to the superior remission rates seen with inotuzumab ozogamicin, patients on the antibody-drug conjugate had significantly longer duration of remissions, at a median of 4.6 months vs. 3.1 months for patients on chemotherapy (P = .003).

An intention-to-treat survival analysis including all 326 patients randomized in the trial showed that progression-free survival was significantly longer in the inotuzumab ozogamicin group, at a median of 5.0 vs. 1.8 months (hazard ratio .45 P less than .001).

Neil Osterweil/Frontline Medical News

Overall survival was slightly better with inotuzumab, at a median of 7.7 months vs. 6.7 months, but this did not meet the study definition of significantly improved overall survival with a pre-specified boundary of P = .014 or lower.

In the safety population, which included 139 patients assigned to inotuzumab and 120 to chemotherapy who had received at least one dose of the assigned regimen before data cutoff, the most frequent grade 3 or higher non-hematologic adverse events with inotuzumab ozogamicin were liver-related. In all, 13% of patients assigned to inotuzumab in the safety population developed veno-occlusive liver disease of any grade, compared with 1% of those assigned to standard of care.

“This drug showed consistently high activity in several studies, so I think it’s very exciting, The real challenge will be how to proceed, how to incorporate it into clinical trials both in pediatrics and adults,” commented Dr. Shai Izraeli, head of the section of functional genomics and childhood leukemia and cancer research at Sheba Medical Center in Ramat Gan, Israel. Dr. Izraeli was co-moderator of the late-breaking abstract session where the data were presented, but was not involved in the study.

He said in an interview that the challenge for investigators will be to develop clinical trials that combine this agent with different immunotherapies from different companies, which would be a logistical nightmare, “but I think we need to do it.”

The study was funded by Pfizer. Dr. Kantarjian disclosed research support from the company. Dr. Izraeli reported having no relevant disclosures.

Copenhagen – The experimental antibody-drug conjugate inotuzumab ozogamicin was associated with a nearly threefold higher complete remission rate than standard intensive chemotherapy in patients with relapsed/refractory acute lymphoblastic leukemia, investigators reported.

Among 218 patients in a phase III clinical trial, rates of combined complete remissions (CR) and complete remission with incomplete recovery of counts (CRi) were 80.7% for patients randomly assigned to receive the anti-CD22 conjugated antibody inotuzumab ozogamicin, compared with 29.4% for patients assigned to receive a standard intensive chemotherapy regimen chosen by investigators (P less than .001).

In addition, among patients who had complete remissions in both groups, significantly more patients in the inotuzumab ozogamicin group had fewer than .01% marrow blasts, a level below the threshold for minimal residual disease (MRD) (78.4% vs. 28.1%, respectively, P less than .001), reported Dr. Hagop Kantarjian, professor in the department of leukemia at the University of Texas MD Anderson Cancer Center, Houston.

“In my opinion, inotuzumab is well tolerated with appropriate prevention measures, and my hope is that soon in the future, inotuzumab will be used not as a single agent, but in combination with chemotherapy or with other monoclonal antibodies targeting CD19,” he said at the annual congress of the European Hematology Association.

Inotuzumab ozogamicin is an anti-CD22 monoclonal antibody conjugated to calicheamicin, a cytotoxic antibiotic.  CD22 is expressed on the surface of about 90% of B-cell ALL cells.

Dr. Daniel DeAngelo from the Dana-Farber Cancer Institute in Boston reported that in the same cohort of patients, the first 218 of 326 randomized in the INO-VATE trial, , the co-primary endpoint of CR/CRi by independent review was achieved by 80.7% of patients treated with inotuzumab and 33.3% treated with standard of care.The updated data presented at the meeting also are published online in the New England Journal of Medicine 2016 June doi:10.1056/NEJMoa1509277 .

The phase III trial randomized 326 patients with relapsed/refractory CD22-positive ALL due for salvage 1 or 2 therapy to inotuzumab or standard of care, consisting of either the FLAG regimen (fludarabine (Fludara)/cytarabine (Ara-C)/granulocyte colony-stimulating factor), Ara-C plus mitoxantrone (Novantrone), or high-dose Ara-C. The starting dose for inotuzumab was 1.8 mg/m²/cycle and was reduced to 1.5 mg/m²/cycle once a CR or CRi was achieved. Patients were stratified by duration of first remission, salvage 1 or 2, and age.

The first 218 randomized patients were included in the intention-to-treat CR/CRi analysis, which was modified after excluding 13 patients who refused to start treatment, all in the standard-of-care arm.

The patients’ median age was 47 years (ranging up to 79 years), two-thirds were in salvage 1, and more than half had a remission duration of less than 12 months, an adverse prognostic feature.

Dr. Kantarjian reported that in addition to the superior remission rates seen with inotuzumab ozogamicin, patients on the antibody-drug conjugate had significantly longer duration of remissions, at a median of 4.6 months vs. 3.1 months for patients on chemotherapy (P = .003).

An intention-to-treat survival analysis including all 326 patients randomized in the trial showed that progression-free survival was significantly longer in the inotuzumab ozogamicin group, at a median of 5.0 vs. 1.8 months (hazard ratio .45 P less than .001).

Neil Osterweil/Frontline Medical News

Overall survival was slightly better with inotuzumab, at a median of 7.7 months vs. 6.7 months, but this did not meet the study definition of significantly improved overall survival with a pre-specified boundary of P = .014 or lower.

In the safety population, which included 139 patients assigned to inotuzumab and 120 to chemotherapy who had received at least one dose of the assigned regimen before data cutoff, the most frequent grade 3 or higher non-hematologic adverse events with inotuzumab ozogamicin were liver-related. In all, 13% of patients assigned to inotuzumab in the safety population developed veno-occlusive liver disease of any grade, compared with 1% of those assigned to standard of care.

“This drug showed consistently high activity in several studies, so I think it’s very exciting, The real challenge will be how to proceed, how to incorporate it into clinical trials both in pediatrics and adults,” commented Dr. Shai Izraeli, head of the section of functional genomics and childhood leukemia and cancer research at Sheba Medical Center in Ramat Gan, Israel. Dr. Izraeli was co-moderator of the late-breaking abstract session where the data were presented, but was not involved in the study.

He said in an interview that the challenge for investigators will be to develop clinical trials that combine this agent with different immunotherapies from different companies, which would be a logistical nightmare, “but I think we need to do it.”

The study was funded by Pfizer. Dr. Kantarjian disclosed research support from the company. Dr. Izraeli reported having no relevant disclosures.

Copenhagen – A real-life comparison of major bleeding risk with anticoagulants showed that in-hospital mortality was lower with novel oral agents than with vitamin K antagonists, but the risk varied by bleeding site.

Novel oral anticoagulants (NOACs) such as dabigatran (Pradaxa), rivaroxaban (Xarelto), and apixaban (Eliquis) were associated in randomized phase III clinical trials with lower incidences of major bleeding than vitamin K antagonists (VKA) such as warfarin, and the newer, heavily advertised agents are widely used in clinical practice, noted Dr. Laura Franco of the Stroke Unit at the University of Perugia, Italy.

“But there is [little] information about the management and outcomes of major bleeding with NOACs in real life,” she said at a briefing at the annual congress of the European Hematology Association.

Neil Osterweil/Frontline Medical News

To rectify this situation, Dr. Franco and her colleagues at nine Italian hospitals and the NOAC registry based in Dresden, Germany, looked at 30-day mortality and other outcomes among 874 consecutive patients admitted for a major bleeding episode from September 2013 through May 2016. In all, 220 of the patients were on NOACs, and 654 were on VKAs.

Intracranial bleeds occurred in 44% of all patients, but were significantly less common among patients on NOACs than on VKAs (22% vs, 52%, respectively, odds ratio 0.26, P less than .001), whereas gastrointestinal bleeds, which occurred in 30% of all patients, were more frequent with the newer oral agents than with the older VKAs (46% vs. 30%, OR 2.69, P less than .001).

Deaths within 30 days of emergency department admission were less frequent with NOACs (10% vs. 17%, hazard ratio 0.56, P = .012).

“But when we analyzed the subpopulation of patients with different sites of bleeding, we saw that among intracranial hemorrhage, the rate was equal among NOAC and VKAs patients, 25% in both groups,” Dr. Franco said.

Deaths from gastrointestinal bleeding were numerically lower among patients on NOACs (7% vs. 10%), but this difference was not statistically significant.

“The great advantages of the new oral anticoagulants are the reduced risk in intracranial hemorrhage, so we showed that the lower mortality is not due to an intrinsic capacity to reduce deaths by NOACs as compared to VKAs, but to a different pattern of bleeding sites,” Dr. Franco said.

The study funding source was not disclosed. Dr. Franco did not report relevant disclosures.

Copenhagen – A real-life comparison of major bleeding risk with anticoagulants showed that in-hospital mortality was lower with novel oral agents than with vitamin K antagonists, but the risk varied by bleeding site.

Novel oral anticoagulants (NOACs) such as dabigatran (Pradaxa), rivaroxaban (Xarelto), and apixaban (Eliquis) were associated in randomized phase III clinical trials with lower incidences of major bleeding than vitamin K antagonists (VKA) such as warfarin, and the newer, heavily advertised agents are widely used in clinical practice, noted Dr. Laura Franco of the Stroke Unit at the University of Perugia, Italy.

“But there is [little] information about the management and outcomes of major bleeding with NOACs in real life,” she said at a briefing at the annual congress of the European Hematology Association.

Neil Osterweil/Frontline Medical News

To rectify this situation, Dr. Franco and her colleagues at nine Italian hospitals and the NOAC registry based in Dresden, Germany, looked at 30-day mortality and other outcomes among 874 consecutive patients admitted for a major bleeding episode from September 2013 through May 2016. In all, 220 of the patients were on NOACs, and 654 were on VKAs.

Intracranial bleeds occurred in 44% of all patients, but were significantly less common among patients on NOACs than on VKAs (22% vs, 52%, respectively, odds ratio 0.26, P less than .001), whereas gastrointestinal bleeds, which occurred in 30% of all patients, were more frequent with the newer oral agents than with the older VKAs (46% vs. 30%, OR 2.69, P less than .001).

Deaths within 30 days of emergency department admission were less frequent with NOACs (10% vs. 17%, hazard ratio 0.56, P = .012).

“But when we analyzed the subpopulation of patients with different sites of bleeding, we saw that among intracranial hemorrhage, the rate was equal among NOAC and VKAs patients, 25% in both groups,” Dr. Franco said.

Deaths from gastrointestinal bleeding were numerically lower among patients on NOACs (7% vs. 10%), but this difference was not statistically significant.

“The great advantages of the new oral anticoagulants are the reduced risk in intracranial hemorrhage, so we showed that the lower mortality is not due to an intrinsic capacity to reduce deaths by NOACs as compared to VKAs, but to a different pattern of bleeding sites,” Dr. Franco said.

The study funding source was not disclosed. Dr. Franco did not report relevant disclosures.

Copenhagen – A real-life comparison of major bleeding risk with anticoagulants showed that in-hospital mortality was lower with novel oral agents than with vitamin K antagonists, but the risk varied by bleeding site.

Novel oral anticoagulants (NOACs) such as dabigatran (Pradaxa), rivaroxaban (Xarelto), and apixaban (Eliquis) were associated in randomized phase III clinical trials with lower incidences of major bleeding than vitamin K antagonists (VKA) such as warfarin, and the newer, heavily advertised agents are widely used in clinical practice, noted Dr. Laura Franco of the Stroke Unit at the University of Perugia, Italy.

“But there is [little] information about the management and outcomes of major bleeding with NOACs in real life,” she said at a briefing at the annual congress of the European Hematology Association.

Neil Osterweil/Frontline Medical News

To rectify this situation, Dr. Franco and her colleagues at nine Italian hospitals and the NOAC registry based in Dresden, Germany, looked at 30-day mortality and other outcomes among 874 consecutive patients admitted for a major bleeding episode from September 2013 through May 2016. In all, 220 of the patients were on NOACs, and 654 were on VKAs.

Intracranial bleeds occurred in 44% of all patients, but were significantly less common among patients on NOACs than on VKAs (22% vs, 52%, respectively, odds ratio 0.26, P less than .001), whereas gastrointestinal bleeds, which occurred in 30% of all patients, were more frequent with the newer oral agents than with the older VKAs (46% vs. 30%, OR 2.69, P less than .001).

Deaths within 30 days of emergency department admission were less frequent with NOACs (10% vs. 17%, hazard ratio 0.56, P = .012).

“But when we analyzed the subpopulation of patients with different sites of bleeding, we saw that among intracranial hemorrhage, the rate was equal among NOAC and VKAs patients, 25% in both groups,” Dr. Franco said.

Deaths from gastrointestinal bleeding were numerically lower among patients on NOACs (7% vs. 10%), but this difference was not statistically significant.

“The great advantages of the new oral anticoagulants are the reduced risk in intracranial hemorrhage, so we showed that the lower mortality is not due to an intrinsic capacity to reduce deaths by NOACs as compared to VKAs, but to a different pattern of bleeding sites,” Dr. Franco said.

The study funding source was not disclosed. Dr. Franco did not report relevant disclosures.

Copenhagen – Investigators in Italy have found that a recently identified form of inherited thrombocytopenia related to mutations in the gene ETV6 (ETV6-RT) appears to be largely asymptomatic, but puts patients at significantly increased risk for hematologic malignancies, particularly childhood B-cell acute lymphoblastic leukemia (ALL).

“When we are talking about ETV6-related thrombocytopenia patients, we must pay more attention to this hidden but very dangerous risk of developing blood cancer – so that we can define prognosis and plan a personalized follow-up – [rather] than to bleeding complications, which are rare and usually do not affect the quality of life,” said Dr. Federica Melazzini from the University of Pavia, Italy.

Neil Osterweil/Frontline Medical News

At a briefing at the annual congress of the European Hematology Association, Dr. Melazzini described a prospective study of the clinical and laboratory features of the newly identified disorder, with a focus on its association with hematologic cancers.

They enrolled 130 unrelated consecutive patients with inherited thrombocytopenias (IT) who did not have definitive diagnoses because they did exhibit criteria for any of the known forms of IT.

The investigators used whole exome sequencing or Sanger sequencing to look for mutations in ETV6, and when a mutation was identified, all available relatives of the affected participant (proband) also were evaluated. The authors also included data on five patients from two families known to have ETV6-RT from previous studies.

The participants were evaluated with complete blood counts, platelet sizing, flow cytometry studies of platelet membrane glycoproteins, as well as platelet aggregation, activation, adhesion and spreading. Other evaluations included differentiation of human megakaryocytes, morphological analysis of megakaryocytes, megakaryocytes flow cytometry, and evaluation of pro-platelet formation by megakaryocytes differentiated in vitro.

The investigators identified a total of 20 patients from 7 families bearing 5 different mutations in ETV6. Although these patients had only mild thrombocytopenias and a low bleeding tendency, 4 of the 20 had childhood ALL, supporting the association between ETV6 mutations and early leukemic transformation.

This translated into an incidence rate for hematologic malignancies of nearly 1 in 100 persons per year, compared with 1 in 10,000 per year in the general population, Dr. Melazzini said.

The investigators also noted that one patient developed Janus kinase 2 (JAK2)-positive polycythemia vera at age 37 years, “suggesting that this disease should be added to the list of malignancies to which the ETV6-RT predisposes.”

Dr. Melazzini said that clinicians should suspect ETV6-RT when a patient presents with an autosomal inherited thrombocytopenia without platelet macrocytosis, and should confirm the diagnosis with genetic analysis.

Patients also should be followed with whole blood cell counts and peripheral blood smear evaluations every 6-12 months, she recommended.

Dr Anton Hagenbeek, professor of hematology at the University of Amsterdam, who moderated the briefing but was not involved in the study, asked how clinicians should communicate the increased risk of hematologic malignancies to the patients.

Dr. Melazzini replied that patients need counseling about the risks of developing ALL or of passing on the trait if they plan to have children. Additionally, if patients develop ALL, the family should be cautioned against using a related donor for any allogeneic stem cell transplants, she said.

The study funding source was not disclosed. Dr. Melazzini and Dr. Hagenbeek reported no relevant disclosures.

Copenhagen – Investigators in Italy have found that a recently identified form of inherited thrombocytopenia related to mutations in the gene ETV6 (ETV6-RT) appears to be largely asymptomatic, but puts patients at significantly increased risk for hematologic malignancies, particularly childhood B-cell acute lymphoblastic leukemia (ALL).

“When we are talking about ETV6-related thrombocytopenia patients, we must pay more attention to this hidden but very dangerous risk of developing blood cancer – so that we can define prognosis and plan a personalized follow-up – [rather] than to bleeding complications, which are rare and usually do not affect the quality of life,” said Dr. Federica Melazzini from the University of Pavia, Italy.

Neil Osterweil/Frontline Medical News

At a briefing at the annual congress of the European Hematology Association, Dr. Melazzini described a prospective study of the clinical and laboratory features of the newly identified disorder, with a focus on its association with hematologic cancers.

They enrolled 130 unrelated consecutive patients with inherited thrombocytopenias (IT) who did not have definitive diagnoses because they did exhibit criteria for any of the known forms of IT.

The investigators used whole exome sequencing or Sanger sequencing to look for mutations in ETV6, and when a mutation was identified, all available relatives of the affected participant (proband) also were evaluated. The authors also included data on five patients from two families known to have ETV6-RT from previous studies.

The participants were evaluated with complete blood counts, platelet sizing, flow cytometry studies of platelet membrane glycoproteins, as well as platelet aggregation, activation, adhesion and spreading. Other evaluations included differentiation of human megakaryocytes, morphological analysis of megakaryocytes, megakaryocytes flow cytometry, and evaluation of pro-platelet formation by megakaryocytes differentiated in vitro.

The investigators identified a total of 20 patients from 7 families bearing 5 different mutations in ETV6. Although these patients had only mild thrombocytopenias and a low bleeding tendency, 4 of the 20 had childhood ALL, supporting the association between ETV6 mutations and early leukemic transformation.

This translated into an incidence rate for hematologic malignancies of nearly 1 in 100 persons per year, compared with 1 in 10,000 per year in the general population, Dr. Melazzini said.

The investigators also noted that one patient developed Janus kinase 2 (JAK2)-positive polycythemia vera at age 37 years, “suggesting that this disease should be added to the list of malignancies to which the ETV6-RT predisposes.”

Dr. Melazzini said that clinicians should suspect ETV6-RT when a patient presents with an autosomal inherited thrombocytopenia without platelet macrocytosis, and should confirm the diagnosis with genetic analysis.

Patients also should be followed with whole blood cell counts and peripheral blood smear evaluations every 6-12 months, she recommended.

Dr Anton Hagenbeek, professor of hematology at the University of Amsterdam, who moderated the briefing but was not involved in the study, asked how clinicians should communicate the increased risk of hematologic malignancies to the patients.

Dr. Melazzini replied that patients need counseling about the risks of developing ALL or of passing on the trait if they plan to have children. Additionally, if patients develop ALL, the family should be cautioned against using a related donor for any allogeneic stem cell transplants, she said.

The study funding source was not disclosed. Dr. Melazzini and Dr. Hagenbeek reported no relevant disclosures.

Copenhagen – Investigators in Italy have found that a recently identified form of inherited thrombocytopenia related to mutations in the gene ETV6 (ETV6-RT) appears to be largely asymptomatic, but puts patients at significantly increased risk for hematologic malignancies, particularly childhood B-cell acute lymphoblastic leukemia (ALL).

“When we are talking about ETV6-related thrombocytopenia patients, we must pay more attention to this hidden but very dangerous risk of developing blood cancer – so that we can define prognosis and plan a personalized follow-up – [rather] than to bleeding complications, which are rare and usually do not affect the quality of life,” said Dr. Federica Melazzini from the University of Pavia, Italy.

Neil Osterweil/Frontline Medical News

At a briefing at the annual congress of the European Hematology Association, Dr. Melazzini described a prospective study of the clinical and laboratory features of the newly identified disorder, with a focus on its association with hematologic cancers.

They enrolled 130 unrelated consecutive patients with inherited thrombocytopenias (IT) who did not have definitive diagnoses because they did exhibit criteria for any of the known forms of IT.

The investigators used whole exome sequencing or Sanger sequencing to look for mutations in ETV6, and when a mutation was identified, all available relatives of the affected participant (proband) also were evaluated. The authors also included data on five patients from two families known to have ETV6-RT from previous studies.

The participants were evaluated with complete blood counts, platelet sizing, flow cytometry studies of platelet membrane glycoproteins, as well as platelet aggregation, activation, adhesion and spreading. Other evaluations included differentiation of human megakaryocytes, morphological analysis of megakaryocytes, megakaryocytes flow cytometry, and evaluation of pro-platelet formation by megakaryocytes differentiated in vitro.

The investigators identified a total of 20 patients from 7 families bearing 5 different mutations in ETV6. Although these patients had only mild thrombocytopenias and a low bleeding tendency, 4 of the 20 had childhood ALL, supporting the association between ETV6 mutations and early leukemic transformation.

This translated into an incidence rate for hematologic malignancies of nearly 1 in 100 persons per year, compared with 1 in 10,000 per year in the general population, Dr. Melazzini said.

The investigators also noted that one patient developed Janus kinase 2 (JAK2)-positive polycythemia vera at age 37 years, “suggesting that this disease should be added to the list of malignancies to which the ETV6-RT predisposes.”

Dr. Melazzini said that clinicians should suspect ETV6-RT when a patient presents with an autosomal inherited thrombocytopenia without platelet macrocytosis, and should confirm the diagnosis with genetic analysis.

Patients also should be followed with whole blood cell counts and peripheral blood smear evaluations every 6-12 months, she recommended.

Dr Anton Hagenbeek, professor of hematology at the University of Amsterdam, who moderated the briefing but was not involved in the study, asked how clinicians should communicate the increased risk of hematologic malignancies to the patients.

Dr. Melazzini replied that patients need counseling about the risks of developing ALL or of passing on the trait if they plan to have children. Additionally, if patients develop ALL, the family should be cautioned against using a related donor for any allogeneic stem cell transplants, she said.

The study funding source was not disclosed. Dr. Melazzini and Dr. Hagenbeek reported no relevant disclosures.

Copenhagen – Relapse of acute myeloid leukemia among older adults may be caused by pre-leukemic stem cells lurking after treatment.

Among 107 adults with AML treated in a German multicenter clinical trial, 36% were found to have pre-treatment mutations that persisted after therapy, reported Dr. Klaus Metzeler of the University of Munich.

“Mutation persistence after chemotherapy was way more common in older patients, and importantly, patients with persisting mutations had a significantly higher risk of AML recurrence,” he said at a briefing prior to presentation of the data at the annual congress of the European Hematology Association.

Neil Osterweil/Frontline Medical News

The higher relapse risk associated with persistent mutations remained even after adjustment for patient age, cytogenetics, and other risk factors, he noted.

AML can arise from a clone of pre-leukemic stem cells, and it is known that pre-leukemic clones carry genetic mutations that can later be found in leukemic cells. The investigators hypothesized that pre-leukemic clones persisting after chemotherapy could be related treatment outcomes and survival.

To test this idea, they analyzed samples collected from bone marrow or peripheral blood of 107 adults with AML (median age 53 years, range 20-80 years) both before chemotherapy and during the first remission. The majority of remission samples (92%) were collected within the first 180 days of remission.

The investigators looked for the presence of 68 genes known to be recurrently mutated in myeloid malignancies, and identified any sequence alterations with a variant allele frequency of 2% or greater as either known or possible driver mutations, variants of unknown significance, or known germline polymorphisms.

A total of 426 driver mutations in 42 genes were detected in samples collected at diagnosis. In all, 69 patients (64%) had no mutations following chemotherapy. Among the remaining 38 patients, there were 66 persistent mutations in 15 genes. The most common persistent mutations were in the genes DNMT3A, TET2, SRF2, and ASXL1.

“Those are precisely those mutations that are known to occur in these pre-leukemic clones,” Dr. Metzeler said.

Mutations found in the pre-treatment but not the remission samples included those in NMP1, FLT3, WT1, and NRAS.

As noted, patients with one or more persistent mutations tended to be older than those with no mutations, with a median age of 63 years vs. 48 years (P less than .001). Persistence of one or more driver mutations in remission was associated with both significantly shorter relapse-free survival (median 14.3 months vs. 58.0 months, P = .009) and shorter overall survival (median, 39.6 months vs. more than 72 months; P = .005).

In multivariate analyses controlling for age, European LeukemiaNet genetic risk groups, and remission status (complete remission vs. complete remission with incomplete recovery of counts), any persistent mutations was associated with significantly worse relapse-free survival (hazard ratio, 2.2, P =.02) and overall survival (HR, 3.0, P = .008). 

“It is well known that older AML patients have a poor prognosis, but the reasons for that aren’t fully understood yet. So the hypothesis that would come from our data is that frequent persistence of pre-leukemic clones may be one potential explanation for the higher relapse risk that we found in older patients,” Dr. Metzeler said.

Asked how clinicians might go about targeting the escaped mutations, Dr. Metzeler noted that the incidence of pre-leukemic somatic mutations among healthy 70-year-olds is about 10%.

“So the challenge will be to identify those patients who will actually relapse, and then an option in fit patients would be an allogeneic transplant. We don’t have targeted agents at the moment where we can target these specific mutations, and it would be relatively hard to justify giving those patients additional chemotherapy at this point,” he said.

Neil Osterweil/Frontline Medical News

“What this is showing for the first time is a clue as to why a subset will relapse, and now we know that this group exists with these pre-leukemic clones, we can begin to ask questions about why it is they relapse or don’t relapse. Is it something to do with the immune system in those patients who don’t relapse?” commented EHA president Tony Green, M.D., who was not involved in the study, but attended the briefing. Dr. Green is a professor in the department of hematology at the Cambridge Stem Cell Institute, University of Cambridge, U.K.

The study was funded by European Hematology Association research fellowships. Dr. Metzeler and Dr. Green reported no relevant disclosures.

Copenhagen – Relapse of acute myeloid leukemia among older adults may be caused by pre-leukemic stem cells lurking after treatment.

Among 107 adults with AML treated in a German multicenter clinical trial, 36% were found to have pre-treatment mutations that persisted after therapy, reported Dr. Klaus Metzeler of the University of Munich.

“Mutation persistence after chemotherapy was way more common in older patients, and importantly, patients with persisting mutations had a significantly higher risk of AML recurrence,” he said at a briefing prior to presentation of the data at the annual congress of the European Hematology Association.

Neil Osterweil/Frontline Medical News

The higher relapse risk associated with persistent mutations remained even after adjustment for patient age, cytogenetics, and other risk factors, he noted.

AML can arise from a clone of pre-leukemic stem cells, and it is known that pre-leukemic clones carry genetic mutations that can later be found in leukemic cells. The investigators hypothesized that pre-leukemic clones persisting after chemotherapy could be related treatment outcomes and survival.

To test this idea, they analyzed samples collected from bone marrow or peripheral blood of 107 adults with AML (median age 53 years, range 20-80 years) both before chemotherapy and during the first remission. The majority of remission samples (92%) were collected within the first 180 days of remission.

The investigators looked for the presence of 68 genes known to be recurrently mutated in myeloid malignancies, and identified any sequence alterations with a variant allele frequency of 2% or greater as either known or possible driver mutations, variants of unknown significance, or known germline polymorphisms.

A total of 426 driver mutations in 42 genes were detected in samples collected at diagnosis. In all, 69 patients (64%) had no mutations following chemotherapy. Among the remaining 38 patients, there were 66 persistent mutations in 15 genes. The most common persistent mutations were in the genes DNMT3A, TET2, SRF2, and ASXL1.

“Those are precisely those mutations that are known to occur in these pre-leukemic clones,” Dr. Metzeler said.

Mutations found in the pre-treatment but not the remission samples included those in NMP1, FLT3, WT1, and NRAS.

As noted, patients with one or more persistent mutations tended to be older than those with no mutations, with a median age of 63 years vs. 48 years (P less than .001). Persistence of one or more driver mutations in remission was associated with both significantly shorter relapse-free survival (median 14.3 months vs. 58.0 months, P = .009) and shorter overall survival (median, 39.6 months vs. more than 72 months; P = .005).

In multivariate analyses controlling for age, European LeukemiaNet genetic risk groups, and remission status (complete remission vs. complete remission with incomplete recovery of counts), any persistent mutations was associated with significantly worse relapse-free survival (hazard ratio, 2.2, P =.02) and overall survival (HR, 3.0, P = .008). 

“It is well known that older AML patients have a poor prognosis, but the reasons for that aren’t fully understood yet. So the hypothesis that would come from our data is that frequent persistence of pre-leukemic clones may be one potential explanation for the higher relapse risk that we found in older patients,” Dr. Metzeler said.

Asked how clinicians might go about targeting the escaped mutations, Dr. Metzeler noted that the incidence of pre-leukemic somatic mutations among healthy 70-year-olds is about 10%.

“So the challenge will be to identify those patients who will actually relapse, and then an option in fit patients would be an allogeneic transplant. We don’t have targeted agents at the moment where we can target these specific mutations, and it would be relatively hard to justify giving those patients additional chemotherapy at this point,” he said.

Neil Osterweil/Frontline Medical News

“What this is showing for the first time is a clue as to why a subset will relapse, and now we know that this group exists with these pre-leukemic clones, we can begin to ask questions about why it is they relapse or don’t relapse. Is it something to do with the immune system in those patients who don’t relapse?” commented EHA president Tony Green, M.D., who was not involved in the study, but attended the briefing. Dr. Green is a professor in the department of hematology at the Cambridge Stem Cell Institute, University of Cambridge, U.K.

The study was funded by European Hematology Association research fellowships. Dr. Metzeler and Dr. Green reported no relevant disclosures.

Copenhagen – Relapse of acute myeloid leukemia among older adults may be caused by pre-leukemic stem cells lurking after treatment.

Among 107 adults with AML treated in a German multicenter clinical trial, 36% were found to have pre-treatment mutations that persisted after therapy, reported Dr. Klaus Metzeler of the University of Munich.

“Mutation persistence after chemotherapy was way more common in older patients, and importantly, patients with persisting mutations had a significantly higher risk of AML recurrence,” he said at a briefing prior to presentation of the data at the annual congress of the European Hematology Association.

Neil Osterweil/Frontline Medical News

The higher relapse risk associated with persistent mutations remained even after adjustment for patient age, cytogenetics, and other risk factors, he noted.

AML can arise from a clone of pre-leukemic stem cells, and it is known that pre-leukemic clones carry genetic mutations that can later be found in leukemic cells. The investigators hypothesized that pre-leukemic clones persisting after chemotherapy could be related treatment outcomes and survival.

To test this idea, they analyzed samples collected from bone marrow or peripheral blood of 107 adults with AML (median age 53 years, range 20-80 years) both before chemotherapy and during the first remission. The majority of remission samples (92%) were collected within the first 180 days of remission.

The investigators looked for the presence of 68 genes known to be recurrently mutated in myeloid malignancies, and identified any sequence alterations with a variant allele frequency of 2% or greater as either known or possible driver mutations, variants of unknown significance, or known germline polymorphisms.

A total of 426 driver mutations in 42 genes were detected in samples collected at diagnosis. In all, 69 patients (64%) had no mutations following chemotherapy. Among the remaining 38 patients, there were 66 persistent mutations in 15 genes. The most common persistent mutations were in the genes DNMT3A, TET2, SRF2, and ASXL1.

“Those are precisely those mutations that are known to occur in these pre-leukemic clones,” Dr. Metzeler said.

Mutations found in the pre-treatment but not the remission samples included those in NMP1, FLT3, WT1, and NRAS.

As noted, patients with one or more persistent mutations tended to be older than those with no mutations, with a median age of 63 years vs. 48 years (P less than .001). Persistence of one or more driver mutations in remission was associated with both significantly shorter relapse-free survival (median 14.3 months vs. 58.0 months, P = .009) and shorter overall survival (median, 39.6 months vs. more than 72 months; P = .005).

In multivariate analyses controlling for age, European LeukemiaNet genetic risk groups, and remission status (complete remission vs. complete remission with incomplete recovery of counts), any persistent mutations was associated with significantly worse relapse-free survival (hazard ratio, 2.2, P =.02) and overall survival (HR, 3.0, P = .008). 

“It is well known that older AML patients have a poor prognosis, but the reasons for that aren’t fully understood yet. So the hypothesis that would come from our data is that frequent persistence of pre-leukemic clones may be one potential explanation for the higher relapse risk that we found in older patients,” Dr. Metzeler said.

Asked how clinicians might go about targeting the escaped mutations, Dr. Metzeler noted that the incidence of pre-leukemic somatic mutations among healthy 70-year-olds is about 10%.

“So the challenge will be to identify those patients who will actually relapse, and then an option in fit patients would be an allogeneic transplant. We don’t have targeted agents at the moment where we can target these specific mutations, and it would be relatively hard to justify giving those patients additional chemotherapy at this point,” he said.

Neil Osterweil/Frontline Medical News

“What this is showing for the first time is a clue as to why a subset will relapse, and now we know that this group exists with these pre-leukemic clones, we can begin to ask questions about why it is they relapse or don’t relapse. Is it something to do with the immune system in those patients who don’t relapse?” commented EHA president Tony Green, M.D., who was not involved in the study, but attended the briefing. Dr. Green is a professor in the department of hematology at the Cambridge Stem Cell Institute, University of Cambridge, U.K.

The study was funded by European Hematology Association research fellowships. Dr. Metzeler and Dr. Green reported no relevant disclosures.