CML

Tyrosine kinase inhibitor de-escalation is generally safe and may lead to symptom improvement in patients with chronic myeloid leukemia who respond well to the therapy, according to an interim analysis of the nonrandomized phase 2 DESTINY trial.

The findings imply that some patients are unnecessarily overtreated, as responses were sometimes maintained with lower tyrosine kinase inhibitor (TKI) doses, according to Richard E. Clark, MD, of the University of Liverpool, England, and his colleagues (Lancet Haematol. 2017 May 26;4:e310-16).

Of 174 patients with chronic myeloid leukemia (CML) in first chronic phase who had received TKIs for at least 3 years and who were either in stable molecular response 4 logs below the standard arbitrary baseline (MR4, 125 patients) or stable major molecular response (MMR) but not MR4 (49 patients) for at least 12 months at the time of enrollment, 12 (7%) had molecular recurrence during 12 months of half-dose TKI therapy, and all patients who experienced molecular recurrence regained MMR within 4 months of being back on full-dose TKIs, the researchers noted.

The median time to recovery was 77 days.

The recurrence rate was significantly lower in the MR4 cohort than in the MMR cohort (2% vs. 19%; hazard ratio, 0.12), and time to relapse was significantly longer in the MR4 cohort (median, 8.7 vs. 4.4 months), the investigators said.

Recurrence was not associated with age, sex, weight, performance status, BCR-ABL1 transcript type, or duration of TKI therapy, which was a median of 6.9 years overall, they noted.

During the first 3 months of de-escalation, adverse events associated with treatment, including lethargy, diarrhea, rash, and nausea, all improved.

Adverse events during de-escalation occurred in 16 patients, and included one fatality due to worsening of peripheral arterial occlusive disease, but all were deemed unrelated to the TKI or underlying chronic CML, the investigators noted.

Study subjects were adults with positive BCR-ABL1 transcripts, with either e13a2, e14a2, or e19a2 fusion transcript. They were enrolled between December 2013 and April 2015 from 20 hospitals in the United Kingdom; 148 were receiving imatinib, 16 were receiving nilotinib, and 10 were receiving dasatinib. They received half of their standard dose of imatinib (200 mg daily), dasatinib (50 mg daily), or nilotinib (200 mg twice daily) for 12 months. Recurrence during de-escalation was defined as BCR-ABL1:ABL1 ratio greater than 0.1% on two consecutive measurements.

“Although several studies of TKI cessation have been reported, little is known about the feasibility of treatment de-escalation in patients with stable molecular responses,” the investigators wrote, adding that the current study shows that de-escalation is “clearly safe for patients in stable MR4 or deeper remission” and could be a “reasonable option.”

This “practice-changing view” is reinforced by the finding of general improvement of adverse events in both cohorts, they said.

Also of note, de-escalation in this study was associated with savings of almost half the expected TKI costs, they added.

The findings imply that many patients with stable responses might be able to maintain responses on lower TKI doses, they concluded, adding that studies of more ambitious de-escalation are warranted.

Newcastle University and Bloodwise funded the study. Dr. Clark received other grants from Bloodwise during the study, as well as grants and personal fees from Novartis, Bristol-Myers Squibb, and Pfizer, and personal fees from Ariad/Incyte.

[email protected]

Tyrosine kinase inhibitor de-escalation is generally safe and may lead to symptom improvement in patients with chronic myeloid leukemia who respond well to the therapy, according to an interim analysis of the nonrandomized phase 2 DESTINY trial.

The findings imply that some patients are unnecessarily overtreated, as responses were sometimes maintained with lower tyrosine kinase inhibitor (TKI) doses, according to Richard E. Clark, MD, of the University of Liverpool, England, and his colleagues (Lancet Haematol. 2017 May 26;4:e310-16).

Of 174 patients with chronic myeloid leukemia (CML) in first chronic phase who had received TKIs for at least 3 years and who were either in stable molecular response 4 logs below the standard arbitrary baseline (MR4, 125 patients) or stable major molecular response (MMR) but not MR4 (49 patients) for at least 12 months at the time of enrollment, 12 (7%) had molecular recurrence during 12 months of half-dose TKI therapy, and all patients who experienced molecular recurrence regained MMR within 4 months of being back on full-dose TKIs, the researchers noted.

The median time to recovery was 77 days.

The recurrence rate was significantly lower in the MR4 cohort than in the MMR cohort (2% vs. 19%; hazard ratio, 0.12), and time to relapse was significantly longer in the MR4 cohort (median, 8.7 vs. 4.4 months), the investigators said.

Recurrence was not associated with age, sex, weight, performance status, BCR-ABL1 transcript type, or duration of TKI therapy, which was a median of 6.9 years overall, they noted.

During the first 3 months of de-escalation, adverse events associated with treatment, including lethargy, diarrhea, rash, and nausea, all improved.

Adverse events during de-escalation occurred in 16 patients, and included one fatality due to worsening of peripheral arterial occlusive disease, but all were deemed unrelated to the TKI or underlying chronic CML, the investigators noted.

Study subjects were adults with positive BCR-ABL1 transcripts, with either e13a2, e14a2, or e19a2 fusion transcript. They were enrolled between December 2013 and April 2015 from 20 hospitals in the United Kingdom; 148 were receiving imatinib, 16 were receiving nilotinib, and 10 were receiving dasatinib. They received half of their standard dose of imatinib (200 mg daily), dasatinib (50 mg daily), or nilotinib (200 mg twice daily) for 12 months. Recurrence during de-escalation was defined as BCR-ABL1:ABL1 ratio greater than 0.1% on two consecutive measurements.

“Although several studies of TKI cessation have been reported, little is known about the feasibility of treatment de-escalation in patients with stable molecular responses,” the investigators wrote, adding that the current study shows that de-escalation is “clearly safe for patients in stable MR4 or deeper remission” and could be a “reasonable option.”

This “practice-changing view” is reinforced by the finding of general improvement of adverse events in both cohorts, they said.

Also of note, de-escalation in this study was associated with savings of almost half the expected TKI costs, they added.

The findings imply that many patients with stable responses might be able to maintain responses on lower TKI doses, they concluded, adding that studies of more ambitious de-escalation are warranted.

Newcastle University and Bloodwise funded the study. Dr. Clark received other grants from Bloodwise during the study, as well as grants and personal fees from Novartis, Bristol-Myers Squibb, and Pfizer, and personal fees from Ariad/Incyte.

[email protected]

Tyrosine kinase inhibitor de-escalation is generally safe and may lead to symptom improvement in patients with chronic myeloid leukemia who respond well to the therapy, according to an interim analysis of the nonrandomized phase 2 DESTINY trial.

The findings imply that some patients are unnecessarily overtreated, as responses were sometimes maintained with lower tyrosine kinase inhibitor (TKI) doses, according to Richard E. Clark, MD, of the University of Liverpool, England, and his colleagues (Lancet Haematol. 2017 May 26;4:e310-16).

Of 174 patients with chronic myeloid leukemia (CML) in first chronic phase who had received TKIs for at least 3 years and who were either in stable molecular response 4 logs below the standard arbitrary baseline (MR4, 125 patients) or stable major molecular response (MMR) but not MR4 (49 patients) for at least 12 months at the time of enrollment, 12 (7%) had molecular recurrence during 12 months of half-dose TKI therapy, and all patients who experienced molecular recurrence regained MMR within 4 months of being back on full-dose TKIs, the researchers noted.

The median time to recovery was 77 days.

The recurrence rate was significantly lower in the MR4 cohort than in the MMR cohort (2% vs. 19%; hazard ratio, 0.12), and time to relapse was significantly longer in the MR4 cohort (median, 8.7 vs. 4.4 months), the investigators said.

Recurrence was not associated with age, sex, weight, performance status, BCR-ABL1 transcript type, or duration of TKI therapy, which was a median of 6.9 years overall, they noted.

During the first 3 months of de-escalation, adverse events associated with treatment, including lethargy, diarrhea, rash, and nausea, all improved.

Adverse events during de-escalation occurred in 16 patients, and included one fatality due to worsening of peripheral arterial occlusive disease, but all were deemed unrelated to the TKI or underlying chronic CML, the investigators noted.

Study subjects were adults with positive BCR-ABL1 transcripts, with either e13a2, e14a2, or e19a2 fusion transcript. They were enrolled between December 2013 and April 2015 from 20 hospitals in the United Kingdom; 148 were receiving imatinib, 16 were receiving nilotinib, and 10 were receiving dasatinib. They received half of their standard dose of imatinib (200 mg daily), dasatinib (50 mg daily), or nilotinib (200 mg twice daily) for 12 months. Recurrence during de-escalation was defined as BCR-ABL1:ABL1 ratio greater than 0.1% on two consecutive measurements.

“Although several studies of TKI cessation have been reported, little is known about the feasibility of treatment de-escalation in patients with stable molecular responses,” the investigators wrote, adding that the current study shows that de-escalation is “clearly safe for patients in stable MR4 or deeper remission” and could be a “reasonable option.”

This “practice-changing view” is reinforced by the finding of general improvement of adverse events in both cohorts, they said.

Also of note, de-escalation in this study was associated with savings of almost half the expected TKI costs, they added.

The findings imply that many patients with stable responses might be able to maintain responses on lower TKI doses, they concluded, adding that studies of more ambitious de-escalation are warranted.

Newcastle University and Bloodwise funded the study. Dr. Clark received other grants from Bloodwise during the study, as well as grants and personal fees from Novartis, Bristol-Myers Squibb, and Pfizer, and personal fees from Ariad/Incyte.

[email protected]

Photo by Patrick Pelletier

MADRID—Results of the DESTINY trial suggest that chronic myeloid leukemia (CML) patients may improve their chances of successfully stopping treatment with tyrosine kinase inhibitors (TKIs) by first reducing the dose they receive.

CML patients in deep molecular response (MR4) at study entry had a low rate of recurrence when they first de-escalated their TKI dose—receiving half the standard dose—for a year and then completely stopped receiving TKI treatment for a year.

The 2-year recurrence-free survival (RFS) rate was 77%, which is better than the RFS in any comparable study to date, according to Richard Clark, MD, of the University of Liverpool in Liverpool, UK, and his colleagues.

Dr Clark presented results from DESTINY at the 22nd Congress of the European Hematology Association (EHA) as abstract S423.

DESTINY included 174 CML patients (98 male, 76 female) in stable major molecular response (MMR).

At study entry, patients had received imatinib (n=148), nilotinib (n=16), or dasatinib (n=10) for a median duration of 6.8 years.

For the first 12 months of the study, patients had their TKI dose reduced to half the standard dose. So they received imatinib at 200 mg daily, dasatinib at 50 mg daily, or nilotinib at 200 mg twice daily. After that, patients stopped treatment completely.

After the first 12 months, molecular recurrence was lower in patients with stable MR4 at study entry than in patients who were not in MR4 (but still in MMR)—2.4% (3/125) and 18.4% (9/49), respectively (P<0.001).

During the following 12 months, in which patients had completely stopped TKI treatment, there were 26 recurrences and 4 withdrawals among the remaining 117 patients who were in MR4 at baseline, as well as 20 recurrences and 4 withdrawals among the 36 patients not in MR4.

So the RFS was 77% among patients in MR4 at baseline and 39% among the patients not in MR4 (P<0.001).

The researchers said the probability of RFS was unrelated to patients’ age, gender, performance status, or the prior TKI they received (imatinib vs second-generation TKI).

All patients with recurrence ultimately returned to deep remissions when they resumed their TKI treatment.

“TKI de-escalation is safe for most CML patients with stable and excellent responses to TKI therapy after some years of treatment and is associated with improvement in symptoms,” Dr Clark said.

“Overall, our findings are better than any other studies worldwide and imply that our unique, gradual withdrawal of treatment might be important. We don’t yet understand why our results are so good, but this is a happy problem to have.”

Photo by Patrick Pelletier

MADRID—Results of the DESTINY trial suggest that chronic myeloid leukemia (CML) patients may improve their chances of successfully stopping treatment with tyrosine kinase inhibitors (TKIs) by first reducing the dose they receive.

CML patients in deep molecular response (MR4) at study entry had a low rate of recurrence when they first de-escalated their TKI dose—receiving half the standard dose—for a year and then completely stopped receiving TKI treatment for a year.

The 2-year recurrence-free survival (RFS) rate was 77%, which is better than the RFS in any comparable study to date, according to Richard Clark, MD, of the University of Liverpool in Liverpool, UK, and his colleagues.

Dr Clark presented results from DESTINY at the 22nd Congress of the European Hematology Association (EHA) as abstract S423.

DESTINY included 174 CML patients (98 male, 76 female) in stable major molecular response (MMR).

At study entry, patients had received imatinib (n=148), nilotinib (n=16), or dasatinib (n=10) for a median duration of 6.8 years.

For the first 12 months of the study, patients had their TKI dose reduced to half the standard dose. So they received imatinib at 200 mg daily, dasatinib at 50 mg daily, or nilotinib at 200 mg twice daily. After that, patients stopped treatment completely.

After the first 12 months, molecular recurrence was lower in patients with stable MR4 at study entry than in patients who were not in MR4 (but still in MMR)—2.4% (3/125) and 18.4% (9/49), respectively (P<0.001).

During the following 12 months, in which patients had completely stopped TKI treatment, there were 26 recurrences and 4 withdrawals among the remaining 117 patients who were in MR4 at baseline, as well as 20 recurrences and 4 withdrawals among the 36 patients not in MR4.

So the RFS was 77% among patients in MR4 at baseline and 39% among the patients not in MR4 (P<0.001).

The researchers said the probability of RFS was unrelated to patients’ age, gender, performance status, or the prior TKI they received (imatinib vs second-generation TKI).

All patients with recurrence ultimately returned to deep remissions when they resumed their TKI treatment.

“TKI de-escalation is safe for most CML patients with stable and excellent responses to TKI therapy after some years of treatment and is associated with improvement in symptoms,” Dr Clark said.

“Overall, our findings are better than any other studies worldwide and imply that our unique, gradual withdrawal of treatment might be important. We don’t yet understand why our results are so good, but this is a happy problem to have.”

Photo by Patrick Pelletier

MADRID—Results of the DESTINY trial suggest that chronic myeloid leukemia (CML) patients may improve their chances of successfully stopping treatment with tyrosine kinase inhibitors (TKIs) by first reducing the dose they receive.

CML patients in deep molecular response (MR4) at study entry had a low rate of recurrence when they first de-escalated their TKI dose—receiving half the standard dose—for a year and then completely stopped receiving TKI treatment for a year.

The 2-year recurrence-free survival (RFS) rate was 77%, which is better than the RFS in any comparable study to date, according to Richard Clark, MD, of the University of Liverpool in Liverpool, UK, and his colleagues.

Dr Clark presented results from DESTINY at the 22nd Congress of the European Hematology Association (EHA) as abstract S423.

DESTINY included 174 CML patients (98 male, 76 female) in stable major molecular response (MMR).

At study entry, patients had received imatinib (n=148), nilotinib (n=16), or dasatinib (n=10) for a median duration of 6.8 years.

For the first 12 months of the study, patients had their TKI dose reduced to half the standard dose. So they received imatinib at 200 mg daily, dasatinib at 50 mg daily, or nilotinib at 200 mg twice daily. After that, patients stopped treatment completely.

After the first 12 months, molecular recurrence was lower in patients with stable MR4 at study entry than in patients who were not in MR4 (but still in MMR)—2.4% (3/125) and 18.4% (9/49), respectively (P<0.001).

During the following 12 months, in which patients had completely stopped TKI treatment, there were 26 recurrences and 4 withdrawals among the remaining 117 patients who were in MR4 at baseline, as well as 20 recurrences and 4 withdrawals among the 36 patients not in MR4.

So the RFS was 77% among patients in MR4 at baseline and 39% among the patients not in MR4 (P<0.001).

The researchers said the probability of RFS was unrelated to patients’ age, gender, performance status, or the prior TKI they received (imatinib vs second-generation TKI).

All patients with recurrence ultimately returned to deep remissions when they resumed their TKI treatment.

“TKI de-escalation is safe for most CML patients with stable and excellent responses to TKI therapy after some years of treatment and is associated with improvement in symptoms,” Dr Clark said.

“Overall, our findings are better than any other studies worldwide and imply that our unique, gradual withdrawal of treatment might be important. We don’t yet understand why our results are so good, but this is a happy problem to have.”

Image by Difu Wu

The US Food and Drug Administration (FDA) has accepted for priority review a supplemental new drug application (sNDA) for dasatinib (Sprycel).

Bristol Myers Squibb is seeking approval for dasatinib as a treatment for children with Philadelphia chromosome-positive (Ph+) chronic phase (CP) chronic myeloid leukemia (CML), as well as approval for a powder formulation of dasatinib for oral suspension.

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

The agency’s goal is to take action on a priority review application within 6 months of receiving it, rather than the standard 10 months.

The FDA plans to make a decision on the dasatinib sNDA by November 9, 2017.

The sNDA includes data from CA180-226 (NCT00777036), an ongoing, phase 2 trial of dasatinib in pediatric patients with CP-CML who are resistant to or cannot tolerate imatinib and pediatric patients newly diagnosed with CP-CML.

The trial enrolled patients aged 18 and younger with newly diagnosed CML or Ph+ leukemias resistant to or intolerant of imatinib.

Cohort 1 included 29 CP-CML patients resistant to or intolerant of imatinib. Cohort 2 included patients with accelerated/blast phase CML or Ph+ acute lymphoblastic leukemia. Cohort 3 included 84 patients with newly diagnosed CP-CML.

Data from Cohorts 1 and 3 were recently presented at the 2017 ASCO Annual Meeting.

Three months into treatment with dasatinib, patients with CP-CML who were resistant to or intolerant of imatinib (Cohort 1) had a cumulative major cytogenetic response rate of 55.2%. This response rate increased over time to exceed 90% at 24 months.

Newly diagnosed patients with CP-CML (Cohort 3) received dasatinib orally or as powder for oral suspension once daily. They achieved a cumulative complete cytogenetic response rate of 64% as early as 6 months into treatment. This response rate increased to 94% at 24 months.

The median duration of response was not estimable or not yet reached in each cohort at the time of follow-up.

The estimated progression-free survival at 48 months was greater than 75% for patients in Cohort 1 and greater than 90% for patients in Cohort 3.

The safety profile of dasatinib in this study was deemed comparable to that reported in adults with CP-CML. In this study, there were no reported events of pleural/pericardial effusion, pulmonary edema/hypertension, or pulmonary arterial hypertension related to dasatinib.

Dasatinib first received FDA approval in 2006. The drug is currently approved to treat adults with:

• Newly diagnosed Ph+ CP-CML
• Chronic, accelerated, or blast phase Ph+ CML with resistance or intolerance to prior therapy including imatinib
• Ph+ acute lymphoblastic leukemia with resistance or intolerance to prior therapy.
  

Image by Difu Wu

The US Food and Drug Administration (FDA) has accepted for priority review a supplemental new drug application (sNDA) for dasatinib (Sprycel).

Bristol Myers Squibb is seeking approval for dasatinib as a treatment for children with Philadelphia chromosome-positive (Ph+) chronic phase (CP) chronic myeloid leukemia (CML), as well as approval for a powder formulation of dasatinib for oral suspension.

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

The agency’s goal is to take action on a priority review application within 6 months of receiving it, rather than the standard 10 months.

The FDA plans to make a decision on the dasatinib sNDA by November 9, 2017.

The sNDA includes data from CA180-226 (NCT00777036), an ongoing, phase 2 trial of dasatinib in pediatric patients with CP-CML who are resistant to or cannot tolerate imatinib and pediatric patients newly diagnosed with CP-CML.

The trial enrolled patients aged 18 and younger with newly diagnosed CML or Ph+ leukemias resistant to or intolerant of imatinib.

Cohort 1 included 29 CP-CML patients resistant to or intolerant of imatinib. Cohort 2 included patients with accelerated/blast phase CML or Ph+ acute lymphoblastic leukemia. Cohort 3 included 84 patients with newly diagnosed CP-CML.

Data from Cohorts 1 and 3 were recently presented at the 2017 ASCO Annual Meeting.

Three months into treatment with dasatinib, patients with CP-CML who were resistant to or intolerant of imatinib (Cohort 1) had a cumulative major cytogenetic response rate of 55.2%. This response rate increased over time to exceed 90% at 24 months.

Newly diagnosed patients with CP-CML (Cohort 3) received dasatinib orally or as powder for oral suspension once daily. They achieved a cumulative complete cytogenetic response rate of 64% as early as 6 months into treatment. This response rate increased to 94% at 24 months.

The median duration of response was not estimable or not yet reached in each cohort at the time of follow-up.

The estimated progression-free survival at 48 months was greater than 75% for patients in Cohort 1 and greater than 90% for patients in Cohort 3.

The safety profile of dasatinib in this study was deemed comparable to that reported in adults with CP-CML. In this study, there were no reported events of pleural/pericardial effusion, pulmonary edema/hypertension, or pulmonary arterial hypertension related to dasatinib.

Dasatinib first received FDA approval in 2006. The drug is currently approved to treat adults with:

• Newly diagnosed Ph+ CP-CML
• Chronic, accelerated, or blast phase Ph+ CML with resistance or intolerance to prior therapy including imatinib
• Ph+ acute lymphoblastic leukemia with resistance or intolerance to prior therapy.
  

Image by Difu Wu

The US Food and Drug Administration (FDA) has accepted for priority review a supplemental new drug application (sNDA) for dasatinib (Sprycel).

Bristol Myers Squibb is seeking approval for dasatinib as a treatment for children with Philadelphia chromosome-positive (Ph+) chronic phase (CP) chronic myeloid leukemia (CML), as well as approval for a powder formulation of dasatinib for oral suspension.

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

The agency’s goal is to take action on a priority review application within 6 months of receiving it, rather than the standard 10 months.

The FDA plans to make a decision on the dasatinib sNDA by November 9, 2017.

The sNDA includes data from CA180-226 (NCT00777036), an ongoing, phase 2 trial of dasatinib in pediatric patients with CP-CML who are resistant to or cannot tolerate imatinib and pediatric patients newly diagnosed with CP-CML.

The trial enrolled patients aged 18 and younger with newly diagnosed CML or Ph+ leukemias resistant to or intolerant of imatinib.

Cohort 1 included 29 CP-CML patients resistant to or intolerant of imatinib. Cohort 2 included patients with accelerated/blast phase CML or Ph+ acute lymphoblastic leukemia. Cohort 3 included 84 patients with newly diagnosed CP-CML.

Data from Cohorts 1 and 3 were recently presented at the 2017 ASCO Annual Meeting.

Three months into treatment with dasatinib, patients with CP-CML who were resistant to or intolerant of imatinib (Cohort 1) had a cumulative major cytogenetic response rate of 55.2%. This response rate increased over time to exceed 90% at 24 months.

Newly diagnosed patients with CP-CML (Cohort 3) received dasatinib orally or as powder for oral suspension once daily. They achieved a cumulative complete cytogenetic response rate of 64% as early as 6 months into treatment. This response rate increased to 94% at 24 months.

The median duration of response was not estimable or not yet reached in each cohort at the time of follow-up.

The estimated progression-free survival at 48 months was greater than 75% for patients in Cohort 1 and greater than 90% for patients in Cohort 3.

The safety profile of dasatinib in this study was deemed comparable to that reported in adults with CP-CML. In this study, there were no reported events of pleural/pericardial effusion, pulmonary edema/hypertension, or pulmonary arterial hypertension related to dasatinib.

Dasatinib first received FDA approval in 2006. The drug is currently approved to treat adults with:

• Newly diagnosed Ph+ CP-CML
• Chronic, accelerated, or blast phase Ph+ CML with resistance or intolerance to prior therapy including imatinib
• Ph+ acute lymphoblastic leukemia with resistance or intolerance to prior therapy.
  

Image by Difu Wu

The European Commission has approved the inclusion of treatment-free remission (TFR) data in the European Union (EU) product information for nilotinib (Tasigna®).

TFR is the ability to maintain molecular response after stopping tyrosine kinase inhibitor (TKI) therapy in patients with Ph+ chronic myeloid leukemia in chronic phase (CML-CP).

Nilotinib is approved for the treatment of CML-CP in adults resistant or intolerant to at least one prior therapy, including imatinib, and for the treatment of adults with newly diagnosed Ph+ CML.

Nilotinib is the first and only TKI to include TFR data in its product information in the EU, according to Novartis, developer of the drug.

Two large international Ph+ CML trials assessing nilotinib discontinuation—ENESTfreedom and ENESTop—formed the basis of the decision.

The two open-label trials showed that half of Ph+ CML-CP patients who met rigorous predefined response criteria maintained TFR after stopping nilotinib, both in the frontline setting and after switching from imatinib.

Both trials included regular and frequent molecular monitoring of BCR-ABL levels with an assay that could measure transcript levels down to a molecular response (MR) of 4.5. Frequent monitoring after discontinuation helped determine loss of MR 4.0 and major molecular response, indicating the need to re-initiate treatment.

ENESTfreedom

This phase 2 trial (Evaluating Nilotinib Efficacy and Safety in Clinical Trials - Following REsponsE in De nOvo CML-CP Patients) involved 215 patients with Ph+ CML-CP treated at 132 sites across 19 countries.

The trial evaluated whether treatment could be stopped in 190 of the patients after they had achieved a response of MR 4.5 and a sustained deep molecular response for 1 year as first-line treatment.

The results showed that 51.6% of the patients in the trial could discontinue therapy and remain in TFR at the 48-week analysis.

However, ENESTfreedom did not meet its primary endpoint of 50% or more of patients in MMR at 48 weeks in the TFR phase. The median treatment duration was 3.6 years.

Adverse events in the trial included musculoskeletal pain (24.7%) during the first years of the TFR phase compared with 16.3% in those still on nilotinib.

No patient progressed to advanced phase/blast crisis.

ENESTop

This phase 2 trial (Evaluating Nilotinib Efficacy and Safety Trial) involved 163 patients with Ph+ CML-CP treated at 63 sites across 18 countries. Investigators evaluated 126 patients who had been treated with imatinib and then switched to nilotinib and had achieved a sustained deep molecular response for 1 year while on nilotinib.

The trial demonstrated that 57.9% of patients maintained a molecular resonse at 48 weeks after stopping treatment. The trial met its primary endpoint—the proportion of patients who did not lose MR 4.0 or MMR within 48 weeks of discontinuing nilotinib in the TFR phase.

Again, the rates of musuloskeletal pain were higher in the first year of TFR than in patients still on nilotinib in the consolidation phase, 42.1% and 14.3%, respectively.

Results of the EURO-SKI trial also support the idea that certain CML patients can safely stop TKI therapy.

For full prescribing information, see the product insert.

Image by Difu Wu

The European Commission has approved the inclusion of treatment-free remission (TFR) data in the European Union (EU) product information for nilotinib (Tasigna®).

TFR is the ability to maintain molecular response after stopping tyrosine kinase inhibitor (TKI) therapy in patients with Ph+ chronic myeloid leukemia in chronic phase (CML-CP).

Nilotinib is approved for the treatment of CML-CP in adults resistant or intolerant to at least one prior therapy, including imatinib, and for the treatment of adults with newly diagnosed Ph+ CML.

Nilotinib is the first and only TKI to include TFR data in its product information in the EU, according to Novartis, developer of the drug.

Two large international Ph+ CML trials assessing nilotinib discontinuation—ENESTfreedom and ENESTop—formed the basis of the decision.

The two open-label trials showed that half of Ph+ CML-CP patients who met rigorous predefined response criteria maintained TFR after stopping nilotinib, both in the frontline setting and after switching from imatinib.

Both trials included regular and frequent molecular monitoring of BCR-ABL levels with an assay that could measure transcript levels down to a molecular response (MR) of 4.5. Frequent monitoring after discontinuation helped determine loss of MR 4.0 and major molecular response, indicating the need to re-initiate treatment.

ENESTfreedom

This phase 2 trial (Evaluating Nilotinib Efficacy and Safety in Clinical Trials - Following REsponsE in De nOvo CML-CP Patients) involved 215 patients with Ph+ CML-CP treated at 132 sites across 19 countries.

The trial evaluated whether treatment could be stopped in 190 of the patients after they had achieved a response of MR 4.5 and a sustained deep molecular response for 1 year as first-line treatment.

The results showed that 51.6% of the patients in the trial could discontinue therapy and remain in TFR at the 48-week analysis.

However, ENESTfreedom did not meet its primary endpoint of 50% or more of patients in MMR at 48 weeks in the TFR phase. The median treatment duration was 3.6 years.

Adverse events in the trial included musculoskeletal pain (24.7%) during the first years of the TFR phase compared with 16.3% in those still on nilotinib.

No patient progressed to advanced phase/blast crisis.

ENESTop

This phase 2 trial (Evaluating Nilotinib Efficacy and Safety Trial) involved 163 patients with Ph+ CML-CP treated at 63 sites across 18 countries. Investigators evaluated 126 patients who had been treated with imatinib and then switched to nilotinib and had achieved a sustained deep molecular response for 1 year while on nilotinib.

The trial demonstrated that 57.9% of patients maintained a molecular resonse at 48 weeks after stopping treatment. The trial met its primary endpoint—the proportion of patients who did not lose MR 4.0 or MMR within 48 weeks of discontinuing nilotinib in the TFR phase.

Again, the rates of musuloskeletal pain were higher in the first year of TFR than in patients still on nilotinib in the consolidation phase, 42.1% and 14.3%, respectively.

Results of the EURO-SKI trial also support the idea that certain CML patients can safely stop TKI therapy.

For full prescribing information, see the product insert.

Image by Difu Wu

The European Commission has approved the inclusion of treatment-free remission (TFR) data in the European Union (EU) product information for nilotinib (Tasigna®).

TFR is the ability to maintain molecular response after stopping tyrosine kinase inhibitor (TKI) therapy in patients with Ph+ chronic myeloid leukemia in chronic phase (CML-CP).

Nilotinib is approved for the treatment of CML-CP in adults resistant or intolerant to at least one prior therapy, including imatinib, and for the treatment of adults with newly diagnosed Ph+ CML.

Nilotinib is the first and only TKI to include TFR data in its product information in the EU, according to Novartis, developer of the drug.

Two large international Ph+ CML trials assessing nilotinib discontinuation—ENESTfreedom and ENESTop—formed the basis of the decision.

The two open-label trials showed that half of Ph+ CML-CP patients who met rigorous predefined response criteria maintained TFR after stopping nilotinib, both in the frontline setting and after switching from imatinib.

Both trials included regular and frequent molecular monitoring of BCR-ABL levels with an assay that could measure transcript levels down to a molecular response (MR) of 4.5. Frequent monitoring after discontinuation helped determine loss of MR 4.0 and major molecular response, indicating the need to re-initiate treatment.

ENESTfreedom

This phase 2 trial (Evaluating Nilotinib Efficacy and Safety in Clinical Trials - Following REsponsE in De nOvo CML-CP Patients) involved 215 patients with Ph+ CML-CP treated at 132 sites across 19 countries.

The trial evaluated whether treatment could be stopped in 190 of the patients after they had achieved a response of MR 4.5 and a sustained deep molecular response for 1 year as first-line treatment.

The results showed that 51.6% of the patients in the trial could discontinue therapy and remain in TFR at the 48-week analysis.

However, ENESTfreedom did not meet its primary endpoint of 50% or more of patients in MMR at 48 weeks in the TFR phase. The median treatment duration was 3.6 years.

Adverse events in the trial included musculoskeletal pain (24.7%) during the first years of the TFR phase compared with 16.3% in those still on nilotinib.

No patient progressed to advanced phase/blast crisis.

ENESTop

This phase 2 trial (Evaluating Nilotinib Efficacy and Safety Trial) involved 163 patients with Ph+ CML-CP treated at 63 sites across 18 countries. Investigators evaluated 126 patients who had been treated with imatinib and then switched to nilotinib and had achieved a sustained deep molecular response for 1 year while on nilotinib.

The trial demonstrated that 57.9% of patients maintained a molecular resonse at 48 weeks after stopping treatment. The trial met its primary endpoint—the proportion of patients who did not lose MR 4.0 or MMR within 48 weeks of discontinuing nilotinib in the TFR phase.

Again, the rates of musuloskeletal pain were higher in the first year of TFR than in patients still on nilotinib in the consolidation phase, 42.1% and 14.3%, respectively.

Results of the EURO-SKI trial also support the idea that certain CML patients can safely stop TKI therapy.

For full prescribing information, see the product insert.

Photo by Bill Branson

CHICAGO—The largest ongoing and prospective trial of pediatric patients with chronic myeloid leukemia in chronic phase (CML-CP), according to the best knowledge of the investigators, has found dasatinib to be safe and effective as first- or second-line therapy for these children.

Patients refractory to or intolerant of imatinib had a major cytogenetic response (MCyR) by 3 months and responses at 12 and 24 months exceeded 90%.

Newly diagnosed patients had a complete cytogenetic response (CCyR) by 6 months.

“We believe our data suggests that dasatinib could be considered as a new standard of care (SOC) for children with CML in chronic phase,” said study author Lia Gore, MD, of the University of Colorado School of Medicine/Children’s Hospital Colorado in Aurora.

She presented the findings of the study at the ASCO 2017 Annual Meeting (abstract 10511).

Study design

CA 180-226 is a phase 2, open-label, nonrandomized, prospective study conducted in 18 countries. Patients younger than 18 years with newly diagnosed CML-CP, or imatinib-resistant/intolerant (R/I) CML-CP, or CML in accelerated phase, or Ph+ acute lymphoblastic leukemia (ALL) were enrolled on the study between March 2009 and September 2014.

Dr Gore’s presentation focused on the CML-CP patients in the study, both the newly diagnosed and the imatinib-R/I patients.

The imatinib-R/I patients received dasatinib 60 mg/m² tablets once daily, and the newly diagnosed patients received the same tablet dosage daily or a powdered formulation for oral suspension (PFOS) of dasatinib at 72 mg/m² daily.

Dr Gore noted the different dosage in the oral suspension formulation is based on bioavailability studies performed in adults, which was determined to be equivalent to the 60 mg/m² tablet formulation.

Once accrual was reached in the tablet cohort, newly diagnosed patients were accrued to the PFOS cohort. The patients on PFOS could switch to tablets after a year or more on the oral suspension.

Patients remained on treatment until disease progression, unacceptable toxicity occurred, or the patient/physician preference.

All patients had a minimum follow-up of 2 years. The longest follow-up was more than 90 months.

Primary objectives of the study were MCyR greater than 30% for imatinib-R/I patients and complete CCyR greater than 55% for newly diagnosed patients.

Secondary objectives included time to and duration of response, major molecular response (MMR), progression-free survival (PFS), overall survival (OS), and safety.

Baseline patient characteristics

One hundred thirteen patients were treated across the 3 cohorts—29 in the imatinib-R/I receiving tablets, 51 newly diagnosed patients receiving tablets, and 33 newly diagnosed patients in the PFOS arm. A total of 84 patients had newly diagnosed disease.

Of the 29 imatinib-R/I patients, 25 were resistant, 2 intolerant, and 2 undetermined. And 6 of the 25 resistant patients had defined imatinib-resistance mutations.

Median age was 13.8 years in the imatinib-R/I cohort, 12.9 years in the newly diagnosed on tablets, and 11.7 years in the PFOS group. Other baseline characteristics were similar among the cohorts.

“Importantly, there were 3 patients less than 2 years of age, and a substantial proportion of patients were actually less than 12 years of age,” Dr Gore pointed out.

Dasatinib exposure

The median duration of therapy was 50 months and 42 months in the R/I and newly diagnosed cohorts, respectively.

Forty-eight percent of the imatinib-R/I patients and 73% of the newly diagnosed patients are still on treatment. A relatively small number of patients discontinued therapy.

The median duration of therapy was shorter in the PFOS cohort because they were enrolled only after accrual to the tablet cohort. However, they were also followed up for more than 2 years.

Of the 33 patients on PFOS, 22 eventually switched to tablet formulation.

Results

The primary endpoint for imatinib-R/I patients—MCyR greater than 30%—was reached by 3 months, and MCyR at 12 and 24 months exceeded 90%. The median time to response was 3.1 months (range, 2.8 – 4.1), and median duration of response was not yet reached (range, 54.9 – not estimable).

For newly diagnosed patients, the preset defined rate of interest of 55% for CCyR was reached as early as 6 months, and exceeded 90% by 12 and 24 months.

Dr Gore pointed out that intolerant patients also reached CCyR relatively quickly, although it was not a specified endpoint.

Data indicate that responses occurred relatively quickly and continued to increase over time of follow-up.

MMR also continued to increase over time and showed no difference between formulation and response rate.

Median PFS has not been reached, as only 7 patients in each cohort had disease progression.

One imatinib-R/I patient died 1 year after stopping treatment. The patient, who had a GI bleed unrelated to dasatinib, had discontinued therapy for progressive disease with loss of MCyR.

Safety

Overall safety was very similar to the dasatinib exposure and experience in adults, Dr Gore said, and there were no differences in events between PFOS and tablets.

One patient in the PFOS cohort had a dasatinib-related grade 3 hypersensitivity reaction, which resolved after discontinuation of dasatinib.

“What’s important here,” she said, “is that there were almost no adverse events of severity in either cohort, only 1 in the imatinib refractory and intolerant and 1 in the newly diagnosed cohorts.”

“Most importantly for those of us with a lot of experience in this field,” she added, “there were no occurrences of pleural effusion, pericardial effusion, pulmonary edema, pulmonary hypertension, or any vascular occlusive events in patients noted on this trial.”

“Additionally, for pediatricians, we care a lot about what happens to growth in these patients and prospectively we collected a lot of data related to growth parameters in bone growth and development."

Of the dasatinib-related adverse events occurring in 10% or more of patients, there were only 5 growth and development events noted out of the 113 patients treated and all were grade 1 or 2 events, Dr Gore pointed out.

In the R/I cohort, one patient had osteopenia and gynecomastia. At the time of data analysis, this event had resolved even though the patient continued on dasatinib.

“We believe our data suggests that dasatinib could be considered as a new standard of care for children with CML in chronic phase,” she said.

“It includes the advantage of a liquid formulation as well as the advantages of once daily dosing and administration without regard to fed or fasting state,” she added, “which for all of us who treat children know could be quite important.”

The study was funded by Bristol-Myers Squibb.

Photo by Bill Branson

CHICAGO—The largest ongoing and prospective trial of pediatric patients with chronic myeloid leukemia in chronic phase (CML-CP), according to the best knowledge of the investigators, has found dasatinib to be safe and effective as first- or second-line therapy for these children.

Patients refractory to or intolerant of imatinib had a major cytogenetic response (MCyR) by 3 months and responses at 12 and 24 months exceeded 90%.

Newly diagnosed patients had a complete cytogenetic response (CCyR) by 6 months.

“We believe our data suggests that dasatinib could be considered as a new standard of care (SOC) for children with CML in chronic phase,” said study author Lia Gore, MD, of the University of Colorado School of Medicine/Children’s Hospital Colorado in Aurora.

She presented the findings of the study at the ASCO 2017 Annual Meeting (abstract 10511).

Study design

CA 180-226 is a phase 2, open-label, nonrandomized, prospective study conducted in 18 countries. Patients younger than 18 years with newly diagnosed CML-CP, or imatinib-resistant/intolerant (R/I) CML-CP, or CML in accelerated phase, or Ph+ acute lymphoblastic leukemia (ALL) were enrolled on the study between March 2009 and September 2014.

Dr Gore’s presentation focused on the CML-CP patients in the study, both the newly diagnosed and the imatinib-R/I patients.

The imatinib-R/I patients received dasatinib 60 mg/m² tablets once daily, and the newly diagnosed patients received the same tablet dosage daily or a powdered formulation for oral suspension (PFOS) of dasatinib at 72 mg/m² daily.

Dr Gore noted the different dosage in the oral suspension formulation is based on bioavailability studies performed in adults, which was determined to be equivalent to the 60 mg/m² tablet formulation.

Once accrual was reached in the tablet cohort, newly diagnosed patients were accrued to the PFOS cohort. The patients on PFOS could switch to tablets after a year or more on the oral suspension.

Patients remained on treatment until disease progression, unacceptable toxicity occurred, or the patient/physician preference.

All patients had a minimum follow-up of 2 years. The longest follow-up was more than 90 months.

Primary objectives of the study were MCyR greater than 30% for imatinib-R/I patients and complete CCyR greater than 55% for newly diagnosed patients.

Secondary objectives included time to and duration of response, major molecular response (MMR), progression-free survival (PFS), overall survival (OS), and safety.

Baseline patient characteristics

One hundred thirteen patients were treated across the 3 cohorts—29 in the imatinib-R/I receiving tablets, 51 newly diagnosed patients receiving tablets, and 33 newly diagnosed patients in the PFOS arm. A total of 84 patients had newly diagnosed disease.

Of the 29 imatinib-R/I patients, 25 were resistant, 2 intolerant, and 2 undetermined. And 6 of the 25 resistant patients had defined imatinib-resistance mutations.

Median age was 13.8 years in the imatinib-R/I cohort, 12.9 years in the newly diagnosed on tablets, and 11.7 years in the PFOS group. Other baseline characteristics were similar among the cohorts.

“Importantly, there were 3 patients less than 2 years of age, and a substantial proportion of patients were actually less than 12 years of age,” Dr Gore pointed out.

Dasatinib exposure

The median duration of therapy was 50 months and 42 months in the R/I and newly diagnosed cohorts, respectively.

Forty-eight percent of the imatinib-R/I patients and 73% of the newly diagnosed patients are still on treatment. A relatively small number of patients discontinued therapy.

The median duration of therapy was shorter in the PFOS cohort because they were enrolled only after accrual to the tablet cohort. However, they were also followed up for more than 2 years.

Of the 33 patients on PFOS, 22 eventually switched to tablet formulation.

Results

The primary endpoint for imatinib-R/I patients—MCyR greater than 30%—was reached by 3 months, and MCyR at 12 and 24 months exceeded 90%. The median time to response was 3.1 months (range, 2.8 – 4.1), and median duration of response was not yet reached (range, 54.9 – not estimable).

For newly diagnosed patients, the preset defined rate of interest of 55% for CCyR was reached as early as 6 months, and exceeded 90% by 12 and 24 months.

Dr Gore pointed out that intolerant patients also reached CCyR relatively quickly, although it was not a specified endpoint.

Data indicate that responses occurred relatively quickly and continued to increase over time of follow-up.

MMR also continued to increase over time and showed no difference between formulation and response rate.

Median PFS has not been reached, as only 7 patients in each cohort had disease progression.

One imatinib-R/I patient died 1 year after stopping treatment. The patient, who had a GI bleed unrelated to dasatinib, had discontinued therapy for progressive disease with loss of MCyR.

Safety

Overall safety was very similar to the dasatinib exposure and experience in adults, Dr Gore said, and there were no differences in events between PFOS and tablets.

One patient in the PFOS cohort had a dasatinib-related grade 3 hypersensitivity reaction, which resolved after discontinuation of dasatinib.

“What’s important here,” she said, “is that there were almost no adverse events of severity in either cohort, only 1 in the imatinib refractory and intolerant and 1 in the newly diagnosed cohorts.”

“Most importantly for those of us with a lot of experience in this field,” she added, “there were no occurrences of pleural effusion, pericardial effusion, pulmonary edema, pulmonary hypertension, or any vascular occlusive events in patients noted on this trial.”

“Additionally, for pediatricians, we care a lot about what happens to growth in these patients and prospectively we collected a lot of data related to growth parameters in bone growth and development."

Of the dasatinib-related adverse events occurring in 10% or more of patients, there were only 5 growth and development events noted out of the 113 patients treated and all were grade 1 or 2 events, Dr Gore pointed out.

In the R/I cohort, one patient had osteopenia and gynecomastia. At the time of data analysis, this event had resolved even though the patient continued on dasatinib.

“We believe our data suggests that dasatinib could be considered as a new standard of care for children with CML in chronic phase,” she said.

“It includes the advantage of a liquid formulation as well as the advantages of once daily dosing and administration without regard to fed or fasting state,” she added, “which for all of us who treat children know could be quite important.”

The study was funded by Bristol-Myers Squibb.

Photo by Bill Branson

CHICAGO—The largest ongoing and prospective trial of pediatric patients with chronic myeloid leukemia in chronic phase (CML-CP), according to the best knowledge of the investigators, has found dasatinib to be safe and effective as first- or second-line therapy for these children.

Patients refractory to or intolerant of imatinib had a major cytogenetic response (MCyR) by 3 months and responses at 12 and 24 months exceeded 90%.

Newly diagnosed patients had a complete cytogenetic response (CCyR) by 6 months.

“We believe our data suggests that dasatinib could be considered as a new standard of care (SOC) for children with CML in chronic phase,” said study author Lia Gore, MD, of the University of Colorado School of Medicine/Children’s Hospital Colorado in Aurora.

She presented the findings of the study at the ASCO 2017 Annual Meeting (abstract 10511).

Study design

CA 180-226 is a phase 2, open-label, nonrandomized, prospective study conducted in 18 countries. Patients younger than 18 years with newly diagnosed CML-CP, or imatinib-resistant/intolerant (R/I) CML-CP, or CML in accelerated phase, or Ph+ acute lymphoblastic leukemia (ALL) were enrolled on the study between March 2009 and September 2014.

Dr Gore’s presentation focused on the CML-CP patients in the study, both the newly diagnosed and the imatinib-R/I patients.

The imatinib-R/I patients received dasatinib 60 mg/m² tablets once daily, and the newly diagnosed patients received the same tablet dosage daily or a powdered formulation for oral suspension (PFOS) of dasatinib at 72 mg/m² daily.

Dr Gore noted the different dosage in the oral suspension formulation is based on bioavailability studies performed in adults, which was determined to be equivalent to the 60 mg/m² tablet formulation.

Once accrual was reached in the tablet cohort, newly diagnosed patients were accrued to the PFOS cohort. The patients on PFOS could switch to tablets after a year or more on the oral suspension.

Patients remained on treatment until disease progression, unacceptable toxicity occurred, or the patient/physician preference.

All patients had a minimum follow-up of 2 years. The longest follow-up was more than 90 months.

Primary objectives of the study were MCyR greater than 30% for imatinib-R/I patients and complete CCyR greater than 55% for newly diagnosed patients.

Secondary objectives included time to and duration of response, major molecular response (MMR), progression-free survival (PFS), overall survival (OS), and safety.

Baseline patient characteristics

One hundred thirteen patients were treated across the 3 cohorts—29 in the imatinib-R/I receiving tablets, 51 newly diagnosed patients receiving tablets, and 33 newly diagnosed patients in the PFOS arm. A total of 84 patients had newly diagnosed disease.

Of the 29 imatinib-R/I patients, 25 were resistant, 2 intolerant, and 2 undetermined. And 6 of the 25 resistant patients had defined imatinib-resistance mutations.

Median age was 13.8 years in the imatinib-R/I cohort, 12.9 years in the newly diagnosed on tablets, and 11.7 years in the PFOS group. Other baseline characteristics were similar among the cohorts.

“Importantly, there were 3 patients less than 2 years of age, and a substantial proportion of patients were actually less than 12 years of age,” Dr Gore pointed out.

Dasatinib exposure

The median duration of therapy was 50 months and 42 months in the R/I and newly diagnosed cohorts, respectively.

Forty-eight percent of the imatinib-R/I patients and 73% of the newly diagnosed patients are still on treatment. A relatively small number of patients discontinued therapy.

The median duration of therapy was shorter in the PFOS cohort because they were enrolled only after accrual to the tablet cohort. However, they were also followed up for more than 2 years.

Of the 33 patients on PFOS, 22 eventually switched to tablet formulation.

Results

The primary endpoint for imatinib-R/I patients—MCyR greater than 30%—was reached by 3 months, and MCyR at 12 and 24 months exceeded 90%. The median time to response was 3.1 months (range, 2.8 – 4.1), and median duration of response was not yet reached (range, 54.9 – not estimable).

For newly diagnosed patients, the preset defined rate of interest of 55% for CCyR was reached as early as 6 months, and exceeded 90% by 12 and 24 months.

Dr Gore pointed out that intolerant patients also reached CCyR relatively quickly, although it was not a specified endpoint.

Data indicate that responses occurred relatively quickly and continued to increase over time of follow-up.

MMR also continued to increase over time and showed no difference between formulation and response rate.

Median PFS has not been reached, as only 7 patients in each cohort had disease progression.

One imatinib-R/I patient died 1 year after stopping treatment. The patient, who had a GI bleed unrelated to dasatinib, had discontinued therapy for progressive disease with loss of MCyR.

Safety

Overall safety was very similar to the dasatinib exposure and experience in adults, Dr Gore said, and there were no differences in events between PFOS and tablets.

One patient in the PFOS cohort had a dasatinib-related grade 3 hypersensitivity reaction, which resolved after discontinuation of dasatinib.

“What’s important here,” she said, “is that there were almost no adverse events of severity in either cohort, only 1 in the imatinib refractory and intolerant and 1 in the newly diagnosed cohorts.”

“Most importantly for those of us with a lot of experience in this field,” she added, “there were no occurrences of pleural effusion, pericardial effusion, pulmonary edema, pulmonary hypertension, or any vascular occlusive events in patients noted on this trial.”

“Additionally, for pediatricians, we care a lot about what happens to growth in these patients and prospectively we collected a lot of data related to growth parameters in bone growth and development."

Of the dasatinib-related adverse events occurring in 10% or more of patients, there were only 5 growth and development events noted out of the 113 patients treated and all were grade 1 or 2 events, Dr Gore pointed out.

In the R/I cohort, one patient had osteopenia and gynecomastia. At the time of data analysis, this event had resolved even though the patient continued on dasatinib.

“We believe our data suggests that dasatinib could be considered as a new standard of care for children with CML in chronic phase,” she said.

“It includes the advantage of a liquid formulation as well as the advantages of once daily dosing and administration without regard to fed or fasting state,” she added, “which for all of us who treat children know could be quite important.”

The study was funded by Bristol-Myers Squibb.

Winship Cancer Institute

Physician, researcher, and educator H. Jean Khoury, MD, recently passed away.

He died on Monday, May 22, at the age of 50, after a year-long battle with esophageal cancer.

Dr Khoury led the division of hematology at Winship Cancer Institute of Emory University in Atlanta, Georgia.

He was considered an authority on hematologic malignancies, particularly chronic myeloid leukemia (CML), acute leukemia, and myelodysplastic syndromes (MDS).

Dr Khoury joined Winship Cancer Institute in 2004 as director of the Leukemia Service and associate professor in the Emory School of Medicine.

In 2009, he was promoted to professor and director of the Division of Hematology in the Department of Hematology and Medical Oncology, and he was later named to the R. Randall Rollins Chair in Oncology.

“We are all deeply grieving the loss of this remarkable man who gave so much to Winship,” said Walter J. Curran, Jr, MD, Winship Cancer Institute’s executive director.

“His enthusiasm and love for his patients and his commitment to lessening the burden of cancer for all has been unwavering throughout his life.”

A native of Beirut, Lebanon, Dr Khoury came to the Winship Cancer Institute from Washington University in St Louis, Missouri, where he served on the faculty after completing a fellowship in hematology-oncology.

He earned his medical degree from the Université Catholique de Louvain in Brussels, Belgium, and completed a residency in internal medicine at Memorial Medical Center in Savannah, Georgia.

Dr Khoury was recruited to Winship Cancer Institute by Fadlo R. Khuri, MD, former deputy director of the institute and now president of the American University of Beirut. What he first saw in Dr Khoury was someone who was “in the best sense, a disruptive presence.”

“What you always want in a leader is someone who’s not afraid to be wrong, to take risks,” Dr Khuri said. “Being wrong disrupts the pattern, and Jean was very brave. He didn’t like business as usual, and that showed in the way he took about redeveloping the hematology division, the leukemia program, and his interactions with the transplant division, with faculty, and all across Winship.”

According to his colleagues, Dr Khoury’s guiding principle was how to improve his patients’ lives, whether through research discoveries or through compassionate care.

Even after being diagnosed with cancer himself, Dr Khoury continued to see patients and carry on his work in the clinic and his research.

Dr Khoury pioneered the development of personalized treatment for CML patients and better approaches to improve quality of life for survivors. His research focused on drug development in leukemia and MDS, genomic abnormalities in leukemia, development of cost-effective practice models, and outcome analysis of bone marrow transplant.

He conducted several leukemia and transplant clinical trials, including trials that led to the approval of drugs such as imatinib, dasatinib, and nilotinib.

Dr Khoury received the Georgia Cancer Coalition Distinguished Cancer Scholarship, which allowed for establishment of the Hematological Disorders Tissue Bank at Emory, which now contains annotated germline and somatic samples from more than 800 patients with various hematologic disorders.

Dr Khoury died at home with his family by his side. He is survived by his wife, Angela, and 3 children, Mikhail, Iman, and Alya.

In lieu of flowers, the family requests that contributions be made to a new fund at Winship Cancer Institute that will memorialize the life and work of Dr Khoury by supporting a fellowship program that was so meaningful to him.

Contributions, marked in Memory of Dr H. Jean Khoury, can be sent to Winship Cancer Institute of Emory University, Office of Gift Records, Emory University, 1762 Clifton Rd. NE, Suite 1400, Atlanta, GA 30322. Gifts can also be made online.

There will be a memorial service for Dr Khoury on Wednesday, May 31, at 4:30 pm at Glenn Memorial Church, 1652 North Decatur Road in Atlanta, Georgia. 

Winship Cancer Institute

Physician, researcher, and educator H. Jean Khoury, MD, recently passed away.

He died on Monday, May 22, at the age of 50, after a year-long battle with esophageal cancer.

Dr Khoury led the division of hematology at Winship Cancer Institute of Emory University in Atlanta, Georgia.

He was considered an authority on hematologic malignancies, particularly chronic myeloid leukemia (CML), acute leukemia, and myelodysplastic syndromes (MDS).

Dr Khoury joined Winship Cancer Institute in 2004 as director of the Leukemia Service and associate professor in the Emory School of Medicine.

In 2009, he was promoted to professor and director of the Division of Hematology in the Department of Hematology and Medical Oncology, and he was later named to the R. Randall Rollins Chair in Oncology.

“We are all deeply grieving the loss of this remarkable man who gave so much to Winship,” said Walter J. Curran, Jr, MD, Winship Cancer Institute’s executive director.

“His enthusiasm and love for his patients and his commitment to lessening the burden of cancer for all has been unwavering throughout his life.”

A native of Beirut, Lebanon, Dr Khoury came to the Winship Cancer Institute from Washington University in St Louis, Missouri, where he served on the faculty after completing a fellowship in hematology-oncology.

He earned his medical degree from the Université Catholique de Louvain in Brussels, Belgium, and completed a residency in internal medicine at Memorial Medical Center in Savannah, Georgia.

Dr Khoury was recruited to Winship Cancer Institute by Fadlo R. Khuri, MD, former deputy director of the institute and now president of the American University of Beirut. What he first saw in Dr Khoury was someone who was “in the best sense, a disruptive presence.”

“What you always want in a leader is someone who’s not afraid to be wrong, to take risks,” Dr Khuri said. “Being wrong disrupts the pattern, and Jean was very brave. He didn’t like business as usual, and that showed in the way he took about redeveloping the hematology division, the leukemia program, and his interactions with the transplant division, with faculty, and all across Winship.”

According to his colleagues, Dr Khoury’s guiding principle was how to improve his patients’ lives, whether through research discoveries or through compassionate care.

Even after being diagnosed with cancer himself, Dr Khoury continued to see patients and carry on his work in the clinic and his research.

Dr Khoury pioneered the development of personalized treatment for CML patients and better approaches to improve quality of life for survivors. His research focused on drug development in leukemia and MDS, genomic abnormalities in leukemia, development of cost-effective practice models, and outcome analysis of bone marrow transplant.

He conducted several leukemia and transplant clinical trials, including trials that led to the approval of drugs such as imatinib, dasatinib, and nilotinib.

Dr Khoury received the Georgia Cancer Coalition Distinguished Cancer Scholarship, which allowed for establishment of the Hematological Disorders Tissue Bank at Emory, which now contains annotated germline and somatic samples from more than 800 patients with various hematologic disorders.

Dr Khoury died at home with his family by his side. He is survived by his wife, Angela, and 3 children, Mikhail, Iman, and Alya.

In lieu of flowers, the family requests that contributions be made to a new fund at Winship Cancer Institute that will memorialize the life and work of Dr Khoury by supporting a fellowship program that was so meaningful to him.

Contributions, marked in Memory of Dr H. Jean Khoury, can be sent to Winship Cancer Institute of Emory University, Office of Gift Records, Emory University, 1762 Clifton Rd. NE, Suite 1400, Atlanta, GA 30322. Gifts can also be made online.

There will be a memorial service for Dr Khoury on Wednesday, May 31, at 4:30 pm at Glenn Memorial Church, 1652 North Decatur Road in Atlanta, Georgia. 

Winship Cancer Institute

Physician, researcher, and educator H. Jean Khoury, MD, recently passed away.

He died on Monday, May 22, at the age of 50, after a year-long battle with esophageal cancer.

Dr Khoury led the division of hematology at Winship Cancer Institute of Emory University in Atlanta, Georgia.

He was considered an authority on hematologic malignancies, particularly chronic myeloid leukemia (CML), acute leukemia, and myelodysplastic syndromes (MDS).

Dr Khoury joined Winship Cancer Institute in 2004 as director of the Leukemia Service and associate professor in the Emory School of Medicine.

In 2009, he was promoted to professor and director of the Division of Hematology in the Department of Hematology and Medical Oncology, and he was later named to the R. Randall Rollins Chair in Oncology.

“We are all deeply grieving the loss of this remarkable man who gave so much to Winship,” said Walter J. Curran, Jr, MD, Winship Cancer Institute’s executive director.

“His enthusiasm and love for his patients and his commitment to lessening the burden of cancer for all has been unwavering throughout his life.”

A native of Beirut, Lebanon, Dr Khoury came to the Winship Cancer Institute from Washington University in St Louis, Missouri, where he served on the faculty after completing a fellowship in hematology-oncology.

He earned his medical degree from the Université Catholique de Louvain in Brussels, Belgium, and completed a residency in internal medicine at Memorial Medical Center in Savannah, Georgia.

Dr Khoury was recruited to Winship Cancer Institute by Fadlo R. Khuri, MD, former deputy director of the institute and now president of the American University of Beirut. What he first saw in Dr Khoury was someone who was “in the best sense, a disruptive presence.”

“What you always want in a leader is someone who’s not afraid to be wrong, to take risks,” Dr Khuri said. “Being wrong disrupts the pattern, and Jean was very brave. He didn’t like business as usual, and that showed in the way he took about redeveloping the hematology division, the leukemia program, and his interactions with the transplant division, with faculty, and all across Winship.”

According to his colleagues, Dr Khoury’s guiding principle was how to improve his patients’ lives, whether through research discoveries or through compassionate care.

Even after being diagnosed with cancer himself, Dr Khoury continued to see patients and carry on his work in the clinic and his research.

Dr Khoury pioneered the development of personalized treatment for CML patients and better approaches to improve quality of life for survivors. His research focused on drug development in leukemia and MDS, genomic abnormalities in leukemia, development of cost-effective practice models, and outcome analysis of bone marrow transplant.

He conducted several leukemia and transplant clinical trials, including trials that led to the approval of drugs such as imatinib, dasatinib, and nilotinib.

Dr Khoury received the Georgia Cancer Coalition Distinguished Cancer Scholarship, which allowed for establishment of the Hematological Disorders Tissue Bank at Emory, which now contains annotated germline and somatic samples from more than 800 patients with various hematologic disorders.

Dr Khoury died at home with his family by his side. He is survived by his wife, Angela, and 3 children, Mikhail, Iman, and Alya.

In lieu of flowers, the family requests that contributions be made to a new fund at Winship Cancer Institute that will memorialize the life and work of Dr Khoury by supporting a fellowship program that was so meaningful to him.

Contributions, marked in Memory of Dr H. Jean Khoury, can be sent to Winship Cancer Institute of Emory University, Office of Gift Records, Emory University, 1762 Clifton Rd. NE, Suite 1400, Atlanta, GA 30322. Gifts can also be made online.

There will be a memorial service for Dr Khoury on Wednesday, May 31, at 4:30 pm at Glenn Memorial Church, 1652 North Decatur Road in Atlanta, Georgia. 

Image by Difu Wu

Researchers say they’ve developed a technique for single-cell analysis that has revealed a population of treatment-resistant stem cells in patients with chronic myeloid leukemia (CML).

“It is increasingly recognized that tumors contain a variety of different cell types, including so-called cancer stem cells, that drive the growth and relapse of a patient’s cancer,” said study author Adam Mead, BM BCh, PhD, of University of Oxford in the UK.

“These cells can be very rare and extremely difficult to find after treatment as they become hidden within the normal tissue. We used a new genetic technique to identify and analyze single cancer stem cells in leukemia patients before and after treatment.”

Dr Mead and his colleagues detailed this research in Nature Medicine.

The team’s single-cell analysis technique combines high-sensitivity mutation detection with whole-transcriptome analysis.

The researchers used the method to analyze stem cells from patients with CML and found the cells to be heterogeneous.

In addition, the team was able to identify a subset of CML stem cells that proved resistant to treatment with tyrosine kinase inhibitors (TKIs).

“We found that, even in individual cases of leukemia, there are various types of cancer stem cell that respond differently to the treatment,” Dr Mead said.

“A small number of these cells are highly resistant to the treatment and are likely to be responsible for disease recurrence when the treatment is stopped. Our research allowed us uniquely to analyze these crucial cells that evade treatment so that we might learn how to more effectively eradicate them.”

The researchers said these TKI-resistant CML stem cells were “transcriptionally distinct” from normal hematopoietic stem cells.

The TKI-resistant cells were characterized by dysregulation of specific genes and pathways—TGF-β, TNF-α, JAK–STAT, CTNNB1, and NFKB1A—that could potentially be targeted to improve the treatment of CML.

The researchers also said their single-cell analysis technique can be used beyond CML.

“This technique could be adapted to analyze a range of different cancers to help predict both the likely response to treatment and the risk of the disease returning in the future,” Dr Mead said. “This should eventually enable treatment to be tailored to target each and every type of cancer stem cell that may be present.” 

Image by Difu Wu

Researchers say they’ve developed a technique for single-cell analysis that has revealed a population of treatment-resistant stem cells in patients with chronic myeloid leukemia (CML).

“It is increasingly recognized that tumors contain a variety of different cell types, including so-called cancer stem cells, that drive the growth and relapse of a patient’s cancer,” said study author Adam Mead, BM BCh, PhD, of University of Oxford in the UK.

“These cells can be very rare and extremely difficult to find after treatment as they become hidden within the normal tissue. We used a new genetic technique to identify and analyze single cancer stem cells in leukemia patients before and after treatment.”

Dr Mead and his colleagues detailed this research in Nature Medicine.

The team’s single-cell analysis technique combines high-sensitivity mutation detection with whole-transcriptome analysis.

The researchers used the method to analyze stem cells from patients with CML and found the cells to be heterogeneous.

In addition, the team was able to identify a subset of CML stem cells that proved resistant to treatment with tyrosine kinase inhibitors (TKIs).

“We found that, even in individual cases of leukemia, there are various types of cancer stem cell that respond differently to the treatment,” Dr Mead said.

“A small number of these cells are highly resistant to the treatment and are likely to be responsible for disease recurrence when the treatment is stopped. Our research allowed us uniquely to analyze these crucial cells that evade treatment so that we might learn how to more effectively eradicate them.”

The researchers said these TKI-resistant CML stem cells were “transcriptionally distinct” from normal hematopoietic stem cells.

The TKI-resistant cells were characterized by dysregulation of specific genes and pathways—TGF-β, TNF-α, JAK–STAT, CTNNB1, and NFKB1A—that could potentially be targeted to improve the treatment of CML.

The researchers also said their single-cell analysis technique can be used beyond CML.

“This technique could be adapted to analyze a range of different cancers to help predict both the likely response to treatment and the risk of the disease returning in the future,” Dr Mead said. “This should eventually enable treatment to be tailored to target each and every type of cancer stem cell that may be present.” 

Image by Difu Wu

Researchers say they’ve developed a technique for single-cell analysis that has revealed a population of treatment-resistant stem cells in patients with chronic myeloid leukemia (CML).

“It is increasingly recognized that tumors contain a variety of different cell types, including so-called cancer stem cells, that drive the growth and relapse of a patient’s cancer,” said study author Adam Mead, BM BCh, PhD, of University of Oxford in the UK.

“These cells can be very rare and extremely difficult to find after treatment as they become hidden within the normal tissue. We used a new genetic technique to identify and analyze single cancer stem cells in leukemia patients before and after treatment.”

Dr Mead and his colleagues detailed this research in Nature Medicine.

The team’s single-cell analysis technique combines high-sensitivity mutation detection with whole-transcriptome analysis.

The researchers used the method to analyze stem cells from patients with CML and found the cells to be heterogeneous.

In addition, the team was able to identify a subset of CML stem cells that proved resistant to treatment with tyrosine kinase inhibitors (TKIs).

“We found that, even in individual cases of leukemia, there are various types of cancer stem cell that respond differently to the treatment,” Dr Mead said.

“A small number of these cells are highly resistant to the treatment and are likely to be responsible for disease recurrence when the treatment is stopped. Our research allowed us uniquely to analyze these crucial cells that evade treatment so that we might learn how to more effectively eradicate them.”

The researchers said these TKI-resistant CML stem cells were “transcriptionally distinct” from normal hematopoietic stem cells.

The TKI-resistant cells were characterized by dysregulation of specific genes and pathways—TGF-β, TNF-α, JAK–STAT, CTNNB1, and NFKB1A—that could potentially be targeted to improve the treatment of CML.

The researchers also said their single-cell analysis technique can be used beyond CML.

“This technique could be adapted to analyze a range of different cancers to help predict both the likely response to treatment and the risk of the disease returning in the future,” Dr Mead said. “This should eventually enable treatment to be tailored to target each and every type of cancer stem cell that may be present.” 

Photo by Rhoda Baer

BOSTON—A pair of preclinical studies suggest the FLT3/BTK inhibitor CG’806 is active in a range of hematologic malignancies.

In one of the studies, CG’806 proved particularly effective against acute myeloid leukemia (AML) cells harboring mutant forms of FLT3, and the compound was able to eradicate AML in mice.

In another study, researchers found CG’806 exhibited “broad potency” against leukemias, lymphomas, myelodysplastic syndromes (MDS), and myeloproliferative neoplasms (MPNs).

Both studies were presented as posters at Hematologic Malignancies: Translating Discoveries to Novel Therapies (poster 25 and poster 44).

Both studies involved researchers from Aptose Biosciences, the company developing CG’806.

Poster 25

Weiguo Zhang, MD, PhD, of The University of Texas MD Anderson Cancer Center in Houston, and his colleagues presented poster 25, “CG’806, a first-in-class FLT3/BTK inhibitor, exerts superior potency against AML cells harboring ITD, TKD and gatekeeper mutated FLT3 or wild-type FLT3.”

The researchers tested CG’806 and other FLT3 inhibitors in human or murine leukemia cell lines with wild-type (WT) FLT3, FLT3-ITD mutations, FLT3 TKD domain mutations, or ITD plus TKD mutations.

Compared to second-generation FLT3 inhibitors (quizartinib, gilteritinib, or crenolanib), CG’806 showed more pronounced anti-proliferative effects in leukemia cells with ITD mutations, D835 mutations, ITD plus F691I/Y842D/D835 mutations, or in FLT3 WT cells.

With CG’086, the IC50s in human AML cell lines were 0.17 nM for MV4-11 (FLT3-ITD) and 0.82 nM for MOLM13 (FLT3-ITD).

The IC50s in the murine leukemia cell lines were 9.49 nM for Ba/F3 (FLT3-WT), 0.30 nM for Ba/F3 (FLT3-ITD), 8.26 nM for Ba/F3 (FLT3-D835Y), 9.72 nM for Ba/F3 (FLT3-ITD+D835Y), and 0.43 nM for Ba/F3 (FLT3-ITD+F691L).

The researchers also found that CG’806 “triggers marked apoptosis” in FLT3-ITD-mutated primary AML samples but minimal apoptosis in normal bone marrow cells.

Another finding was that once-daily oral dosing of CG’806 in a murine model of AML (MV4-11) resulted in sustained micromolar plasma concentration over a 24-hour period.

This was accompanied by complete elimination of AML FLT3-ITD tumors without toxicity, the researchers said.

Poster 44

Stephen E. Kurtz, PhD, of Oregon Health & Science University in Portland, and his colleagues presented poster 44, “CG’806, a First-in-Class FLT3/BTK Inhibitor, Exhibits Potent Activity against AML Patient Samples with Mutant or Wild-Type FLT3, as well as Other Hematologic Malignancy Subtypes.”

The researchers tested CG’806 in samples from patients with AML (n=82), MDS/MPNs (n=15), acute lymphoblastic leukemia (ALL, n=17), chronic lymphocytic leukemia (CLL, n=58), and chronic myeloid leukemia (CML, n=4).

The team observed “broad sensitivity” to CG’806, with 59% (48/82) of AML, 53% (8/15) of MDS/MPN, 40% (23/58) of CLL, 29% (5/17) of ALL, and 25% (1/4) of CML cases exhibiting an IC50 of less than 100 nM.

Among the 38 tested AML samples with known FLT3 mutational status, the FLT3-ITD+ AML samples tended to have enhanced sensitivity to CG’806 (median IC50 = 20 nM, n=8) relative to the FLT3-WT samples (median IC50 = 120 nM, n=30).

The researchers also found that CG’806 exerted potent anti-proliferative activity against human AML, B-ALL, mantle cell lymphoma, Burkitt lymphoma, and diffuse large B-cell lymphoma cell lines.

“The analyses of CG’806 against primary hematologic malignancy patient samples and cultured cell lines show evidence of potent and broad drug activity in AML and other disease subtypes and support further development of this agent for hematologic malignancies,” Dr Kurtz said. 

Photo by Rhoda Baer

BOSTON—A pair of preclinical studies suggest the FLT3/BTK inhibitor CG’806 is active in a range of hematologic malignancies.

In one of the studies, CG’806 proved particularly effective against acute myeloid leukemia (AML) cells harboring mutant forms of FLT3, and the compound was able to eradicate AML in mice.

In another study, researchers found CG’806 exhibited “broad potency” against leukemias, lymphomas, myelodysplastic syndromes (MDS), and myeloproliferative neoplasms (MPNs).

Both studies were presented as posters at Hematologic Malignancies: Translating Discoveries to Novel Therapies (poster 25 and poster 44).

Both studies involved researchers from Aptose Biosciences, the company developing CG’806.

Poster 25

Weiguo Zhang, MD, PhD, of The University of Texas MD Anderson Cancer Center in Houston, and his colleagues presented poster 25, “CG’806, a first-in-class FLT3/BTK inhibitor, exerts superior potency against AML cells harboring ITD, TKD and gatekeeper mutated FLT3 or wild-type FLT3.”

The researchers tested CG’806 and other FLT3 inhibitors in human or murine leukemia cell lines with wild-type (WT) FLT3, FLT3-ITD mutations, FLT3 TKD domain mutations, or ITD plus TKD mutations.

Compared to second-generation FLT3 inhibitors (quizartinib, gilteritinib, or crenolanib), CG’806 showed more pronounced anti-proliferative effects in leukemia cells with ITD mutations, D835 mutations, ITD plus F691I/Y842D/D835 mutations, or in FLT3 WT cells.

With CG’086, the IC50s in human AML cell lines were 0.17 nM for MV4-11 (FLT3-ITD) and 0.82 nM for MOLM13 (FLT3-ITD).

The IC50s in the murine leukemia cell lines were 9.49 nM for Ba/F3 (FLT3-WT), 0.30 nM for Ba/F3 (FLT3-ITD), 8.26 nM for Ba/F3 (FLT3-D835Y), 9.72 nM for Ba/F3 (FLT3-ITD+D835Y), and 0.43 nM for Ba/F3 (FLT3-ITD+F691L).

The researchers also found that CG’806 “triggers marked apoptosis” in FLT3-ITD-mutated primary AML samples but minimal apoptosis in normal bone marrow cells.

Another finding was that once-daily oral dosing of CG’806 in a murine model of AML (MV4-11) resulted in sustained micromolar plasma concentration over a 24-hour period.

This was accompanied by complete elimination of AML FLT3-ITD tumors without toxicity, the researchers said.

Poster 44

Stephen E. Kurtz, PhD, of Oregon Health & Science University in Portland, and his colleagues presented poster 44, “CG’806, a First-in-Class FLT3/BTK Inhibitor, Exhibits Potent Activity against AML Patient Samples with Mutant or Wild-Type FLT3, as well as Other Hematologic Malignancy Subtypes.”

The researchers tested CG’806 in samples from patients with AML (n=82), MDS/MPNs (n=15), acute lymphoblastic leukemia (ALL, n=17), chronic lymphocytic leukemia (CLL, n=58), and chronic myeloid leukemia (CML, n=4).

The team observed “broad sensitivity” to CG’806, with 59% (48/82) of AML, 53% (8/15) of MDS/MPN, 40% (23/58) of CLL, 29% (5/17) of ALL, and 25% (1/4) of CML cases exhibiting an IC50 of less than 100 nM.

Among the 38 tested AML samples with known FLT3 mutational status, the FLT3-ITD+ AML samples tended to have enhanced sensitivity to CG’806 (median IC50 = 20 nM, n=8) relative to the FLT3-WT samples (median IC50 = 120 nM, n=30).

The researchers also found that CG’806 exerted potent anti-proliferative activity against human AML, B-ALL, mantle cell lymphoma, Burkitt lymphoma, and diffuse large B-cell lymphoma cell lines.

“The analyses of CG’806 against primary hematologic malignancy patient samples and cultured cell lines show evidence of potent and broad drug activity in AML and other disease subtypes and support further development of this agent for hematologic malignancies,” Dr Kurtz said. 

Photo by Rhoda Baer

BOSTON—A pair of preclinical studies suggest the FLT3/BTK inhibitor CG’806 is active in a range of hematologic malignancies.

In one of the studies, CG’806 proved particularly effective against acute myeloid leukemia (AML) cells harboring mutant forms of FLT3, and the compound was able to eradicate AML in mice.

In another study, researchers found CG’806 exhibited “broad potency” against leukemias, lymphomas, myelodysplastic syndromes (MDS), and myeloproliferative neoplasms (MPNs).

Both studies were presented as posters at Hematologic Malignancies: Translating Discoveries to Novel Therapies (poster 25 and poster 44).

Both studies involved researchers from Aptose Biosciences, the company developing CG’806.

Poster 25

Weiguo Zhang, MD, PhD, of The University of Texas MD Anderson Cancer Center in Houston, and his colleagues presented poster 25, “CG’806, a first-in-class FLT3/BTK inhibitor, exerts superior potency against AML cells harboring ITD, TKD and gatekeeper mutated FLT3 or wild-type FLT3.”

The researchers tested CG’806 and other FLT3 inhibitors in human or murine leukemia cell lines with wild-type (WT) FLT3, FLT3-ITD mutations, FLT3 TKD domain mutations, or ITD plus TKD mutations.

Compared to second-generation FLT3 inhibitors (quizartinib, gilteritinib, or crenolanib), CG’806 showed more pronounced anti-proliferative effects in leukemia cells with ITD mutations, D835 mutations, ITD plus F691I/Y842D/D835 mutations, or in FLT3 WT cells.

With CG’086, the IC50s in human AML cell lines were 0.17 nM for MV4-11 (FLT3-ITD) and 0.82 nM for MOLM13 (FLT3-ITD).

The IC50s in the murine leukemia cell lines were 9.49 nM for Ba/F3 (FLT3-WT), 0.30 nM for Ba/F3 (FLT3-ITD), 8.26 nM for Ba/F3 (FLT3-D835Y), 9.72 nM for Ba/F3 (FLT3-ITD+D835Y), and 0.43 nM for Ba/F3 (FLT3-ITD+F691L).

The researchers also found that CG’806 “triggers marked apoptosis” in FLT3-ITD-mutated primary AML samples but minimal apoptosis in normal bone marrow cells.

Another finding was that once-daily oral dosing of CG’806 in a murine model of AML (MV4-11) resulted in sustained micromolar plasma concentration over a 24-hour period.

This was accompanied by complete elimination of AML FLT3-ITD tumors without toxicity, the researchers said.

Poster 44

Stephen E. Kurtz, PhD, of Oregon Health & Science University in Portland, and his colleagues presented poster 44, “CG’806, a First-in-Class FLT3/BTK Inhibitor, Exhibits Potent Activity against AML Patient Samples with Mutant or Wild-Type FLT3, as well as Other Hematologic Malignancy Subtypes.”

The researchers tested CG’806 in samples from patients with AML (n=82), MDS/MPNs (n=15), acute lymphoblastic leukemia (ALL, n=17), chronic lymphocytic leukemia (CLL, n=58), and chronic myeloid leukemia (CML, n=4).

The team observed “broad sensitivity” to CG’806, with 59% (48/82) of AML, 53% (8/15) of MDS/MPN, 40% (23/58) of CLL, 29% (5/17) of ALL, and 25% (1/4) of CML cases exhibiting an IC50 of less than 100 nM.

Among the 38 tested AML samples with known FLT3 mutational status, the FLT3-ITD+ AML samples tended to have enhanced sensitivity to CG’806 (median IC50 = 20 nM, n=8) relative to the FLT3-WT samples (median IC50 = 120 nM, n=30).

The researchers also found that CG’806 exerted potent anti-proliferative activity against human AML, B-ALL, mantle cell lymphoma, Burkitt lymphoma, and diffuse large B-cell lymphoma cell lines.

“The analyses of CG’806 against primary hematologic malignancy patient samples and cultured cell lines show evidence of potent and broad drug activity in AML and other disease subtypes and support further development of this agent for hematologic malignancies,” Dr Kurtz said. 

Patients with chronic myeloid leukemia (CML) with high CD86⁺pDC counts had a higher risk of relapse after discontinuing tyrosine kinase inhibitor (TKI) therapy, according to new findings published in Leukemia.

Of patients who achieve a deep molecular remission, only a minority are able to sustain it and remain off therapy. Even when deep remission is achieved, TKI therapy fails to eradicate CML stem cells, which can perpetuate disease.

“This is clinically reflected by the long-term persistence of BCR-ABL messenger RNA (mRNA) in the majority of patients,” wrote C. Schütz, MD, of the University Hospital Marburg (Germany) and colleagues (Leukemia. 2017 Apr;31[4]:829-36). “Even with undetectable BCR-ABL mRNA levels, patients frequently relapse after TKI cessation.”

The researchers investigated whether the expression of the T-cell inhibitory receptor (CTLA-4)-ligand CD86 (B7.2) on plasmacytoid dendritic cells (pDC) could have an effect on the risk of relapse in CML patients who discontinue TKI therapy after achieving remission.

The frequency of CD86⁺pDC was analyzed in 14 CML patients who were in treatment-free remission, in 130 patients in molecular remission who were part of the CML-V study, and prospectively in 122 EURO-SKI patients right before they discontinued TKI therapy.

The authors found that CML patients in molecular remission had a significantly higher frequency of CD86⁺pDC expression, compared with normal donors (P less than .0024). In contrast, those who were in treatment-free remission had consistently low CD86⁺pDC.

These results suggest that low CD86⁺pDC could be predictive of treatment-free remission.

To test the hypothesis that low CD86⁺pDC frequencies during TKI-induced molecular remission were associated with a lower risk of molecular relapse after stopping TKI therapy, the study authors measured CD86⁺pDC levels in the 122 EURO-SKI patients before they stopped therapy, and then prospectively monitored them for relapse.

Findings showed that the 122 EURO-SKI patients had a significantly higher CD86⁺pDC frequency than did 8 healthy donors (median, 20.8% vs. 7.3%; P = .0024).

When matched with the treatment-free remission patients, the 73 patients in the EURO-SKI group who did not relapse within the first 12 months after stopping therapy had a significantly lower median frequency of CD86⁺pDC at baseline, compared with the 49 patients who did relapse (P = .014).

Patients who relapsed also demonstrated higher absolute CD86⁺pDC counts (CD86⁺pDC per 10⁵ lymphocytes) at baseline (median, 86.1 vs. 50.6; P = .0147).

Based on the findings, the authors noted that they provided “for the first time evidence that relapse biology after TKI discontinuation depends on the quantity of activated pDC and a T-cell exhaustion phenotype, rather than TKI pretreatment duration per se.”

The Clinical Research Group of the German Research Foundation and the German José Carreras Leukaemia Foundation funded the study. Several of the authors report relationships with Ariad, Bristol-Myers Squibb, Novartis, and Pfizer.

Patients with chronic myeloid leukemia (CML) with high CD86⁺pDC counts had a higher risk of relapse after discontinuing tyrosine kinase inhibitor (TKI) therapy, according to new findings published in Leukemia.

Of patients who achieve a deep molecular remission, only a minority are able to sustain it and remain off therapy. Even when deep remission is achieved, TKI therapy fails to eradicate CML stem cells, which can perpetuate disease.

“This is clinically reflected by the long-term persistence of BCR-ABL messenger RNA (mRNA) in the majority of patients,” wrote C. Schütz, MD, of the University Hospital Marburg (Germany) and colleagues (Leukemia. 2017 Apr;31[4]:829-36). “Even with undetectable BCR-ABL mRNA levels, patients frequently relapse after TKI cessation.”

The researchers investigated whether the expression of the T-cell inhibitory receptor (CTLA-4)-ligand CD86 (B7.2) on plasmacytoid dendritic cells (pDC) could have an effect on the risk of relapse in CML patients who discontinue TKI therapy after achieving remission.

The frequency of CD86⁺pDC was analyzed in 14 CML patients who were in treatment-free remission, in 130 patients in molecular remission who were part of the CML-V study, and prospectively in 122 EURO-SKI patients right before they discontinued TKI therapy.

The authors found that CML patients in molecular remission had a significantly higher frequency of CD86⁺pDC expression, compared with normal donors (P less than .0024). In contrast, those who were in treatment-free remission had consistently low CD86⁺pDC.

These results suggest that low CD86⁺pDC could be predictive of treatment-free remission.

To test the hypothesis that low CD86⁺pDC frequencies during TKI-induced molecular remission were associated with a lower risk of molecular relapse after stopping TKI therapy, the study authors measured CD86⁺pDC levels in the 122 EURO-SKI patients before they stopped therapy, and then prospectively monitored them for relapse.

Findings showed that the 122 EURO-SKI patients had a significantly higher CD86⁺pDC frequency than did 8 healthy donors (median, 20.8% vs. 7.3%; P = .0024).

When matched with the treatment-free remission patients, the 73 patients in the EURO-SKI group who did not relapse within the first 12 months after stopping therapy had a significantly lower median frequency of CD86⁺pDC at baseline, compared with the 49 patients who did relapse (P = .014).

Patients who relapsed also demonstrated higher absolute CD86⁺pDC counts (CD86⁺pDC per 10⁵ lymphocytes) at baseline (median, 86.1 vs. 50.6; P = .0147).

Based on the findings, the authors noted that they provided “for the first time evidence that relapse biology after TKI discontinuation depends on the quantity of activated pDC and a T-cell exhaustion phenotype, rather than TKI pretreatment duration per se.”

The Clinical Research Group of the German Research Foundation and the German José Carreras Leukaemia Foundation funded the study. Several of the authors report relationships with Ariad, Bristol-Myers Squibb, Novartis, and Pfizer.

Patients with chronic myeloid leukemia (CML) with high CD86⁺pDC counts had a higher risk of relapse after discontinuing tyrosine kinase inhibitor (TKI) therapy, according to new findings published in Leukemia.

Of patients who achieve a deep molecular remission, only a minority are able to sustain it and remain off therapy. Even when deep remission is achieved, TKI therapy fails to eradicate CML stem cells, which can perpetuate disease.

“This is clinically reflected by the long-term persistence of BCR-ABL messenger RNA (mRNA) in the majority of patients,” wrote C. Schütz, MD, of the University Hospital Marburg (Germany) and colleagues (Leukemia. 2017 Apr;31[4]:829-36). “Even with undetectable BCR-ABL mRNA levels, patients frequently relapse after TKI cessation.”

The researchers investigated whether the expression of the T-cell inhibitory receptor (CTLA-4)-ligand CD86 (B7.2) on plasmacytoid dendritic cells (pDC) could have an effect on the risk of relapse in CML patients who discontinue TKI therapy after achieving remission.

The frequency of CD86⁺pDC was analyzed in 14 CML patients who were in treatment-free remission, in 130 patients in molecular remission who were part of the CML-V study, and prospectively in 122 EURO-SKI patients right before they discontinued TKI therapy.

The authors found that CML patients in molecular remission had a significantly higher frequency of CD86⁺pDC expression, compared with normal donors (P less than .0024). In contrast, those who were in treatment-free remission had consistently low CD86⁺pDC.

These results suggest that low CD86⁺pDC could be predictive of treatment-free remission.

To test the hypothesis that low CD86⁺pDC frequencies during TKI-induced molecular remission were associated with a lower risk of molecular relapse after stopping TKI therapy, the study authors measured CD86⁺pDC levels in the 122 EURO-SKI patients before they stopped therapy, and then prospectively monitored them for relapse.

Findings showed that the 122 EURO-SKI patients had a significantly higher CD86⁺pDC frequency than did 8 healthy donors (median, 20.8% vs. 7.3%; P = .0024).

When matched with the treatment-free remission patients, the 73 patients in the EURO-SKI group who did not relapse within the first 12 months after stopping therapy had a significantly lower median frequency of CD86⁺pDC at baseline, compared with the 49 patients who did relapse (P = .014).

Patients who relapsed also demonstrated higher absolute CD86⁺pDC counts (CD86⁺pDC per 10⁵ lymphocytes) at baseline (median, 86.1 vs. 50.6; P = .0147).

Based on the findings, the authors noted that they provided “for the first time evidence that relapse biology after TKI discontinuation depends on the quantity of activated pDC and a T-cell exhaustion phenotype, rather than TKI pretreatment duration per se.”

The Clinical Research Group of the German Research Foundation and the German José Carreras Leukaemia Foundation funded the study. Several of the authors report relationships with Ariad, Bristol-Myers Squibb, Novartis, and Pfizer.

Photo by Darren Baker

A newly launched online database provides researchers with access to data on gene expression in chronic myeloid leukemia (CML).

The LEUKomics database includes datasets relating to clinical parameters in CML, normal and leukemic stem cells, CML disease stages, treatments for the disease, and mouse models of CML.

The database is free for researchers to use and share.

The scientists who developed the database hope it will increase our understanding of CML and lead to new treatments for the disease.

“LEUKomics is a very valuable resource and could help us to reveal new underlying mechanisms that drive CML,” said Jeff Evans, Director of the Institute of Cancer Sciences at the University of Glasgow in Scotland.

“It has the potential to transform CML research on a global level, as the findings can be downloaded and shared with other researchers across the world.  We also hope it inspires new research ideas and ultimately fuels a global search into finding cures for CML.”

The LEUKomics database includes datasets with information on gene expression related to:

• Clinical parameters in CML, such as disease aggressiveness and response to treatment
• Stem and progenitor cells from CML patients and healthy individuals
• Chronic, accelerated, and blast phases of CML
• CML treatment (currently only tyrosine kinase inhibitors)
• Stem and progenitor cells from mouse models of CML.

The LEUKomics database was launched by scientists at the University of Glasgow and the University of Melbourne.

The website has been built as part of the stem cell database Stemformatics, with funding from the Scottish Cancer Foundation and Bloodwise.

“Thanks to research, most patients with CML will now live a normal life by taking a single pill,” said Alasdair Rankin, Director of Research at Bloodwise in London, England.

“But treatment is life-long, and not everyone can tolerate the side effects from their treatment or may not respond and see their CML return. There remains a need to develop a permanent cure for all people with this blood cancer. LEUKomics is a highly innovative way to speed up this search for a cure and should be a valuable asset for the global blood cancer research community. We look forward to seeing its impact in the months to come.”

The LEUKomics database can be accessed at: www.stemformatics.org/leukomics.

Photo by Darren Baker

A newly launched online database provides researchers with access to data on gene expression in chronic myeloid leukemia (CML).

The LEUKomics database includes datasets relating to clinical parameters in CML, normal and leukemic stem cells, CML disease stages, treatments for the disease, and mouse models of CML.

The database is free for researchers to use and share.

The scientists who developed the database hope it will increase our understanding of CML and lead to new treatments for the disease.

“LEUKomics is a very valuable resource and could help us to reveal new underlying mechanisms that drive CML,” said Jeff Evans, Director of the Institute of Cancer Sciences at the University of Glasgow in Scotland.

“It has the potential to transform CML research on a global level, as the findings can be downloaded and shared with other researchers across the world.  We also hope it inspires new research ideas and ultimately fuels a global search into finding cures for CML.”

The LEUKomics database includes datasets with information on gene expression related to:

• Clinical parameters in CML, such as disease aggressiveness and response to treatment
• Stem and progenitor cells from CML patients and healthy individuals
• Chronic, accelerated, and blast phases of CML
• CML treatment (currently only tyrosine kinase inhibitors)
• Stem and progenitor cells from mouse models of CML.

The LEUKomics database was launched by scientists at the University of Glasgow and the University of Melbourne.

The website has been built as part of the stem cell database Stemformatics, with funding from the Scottish Cancer Foundation and Bloodwise.

“Thanks to research, most patients with CML will now live a normal life by taking a single pill,” said Alasdair Rankin, Director of Research at Bloodwise in London, England.

“But treatment is life-long, and not everyone can tolerate the side effects from their treatment or may not respond and see their CML return. There remains a need to develop a permanent cure for all people with this blood cancer. LEUKomics is a highly innovative way to speed up this search for a cure and should be a valuable asset for the global blood cancer research community. We look forward to seeing its impact in the months to come.”

The LEUKomics database can be accessed at: www.stemformatics.org/leukomics.

Photo by Darren Baker

A newly launched online database provides researchers with access to data on gene expression in chronic myeloid leukemia (CML).

The LEUKomics database includes datasets relating to clinical parameters in CML, normal and leukemic stem cells, CML disease stages, treatments for the disease, and mouse models of CML.

The database is free for researchers to use and share.

The scientists who developed the database hope it will increase our understanding of CML and lead to new treatments for the disease.

“LEUKomics is a very valuable resource and could help us to reveal new underlying mechanisms that drive CML,” said Jeff Evans, Director of the Institute of Cancer Sciences at the University of Glasgow in Scotland.

“It has the potential to transform CML research on a global level, as the findings can be downloaded and shared with other researchers across the world.  We also hope it inspires new research ideas and ultimately fuels a global search into finding cures for CML.”

The LEUKomics database includes datasets with information on gene expression related to:

• Clinical parameters in CML, such as disease aggressiveness and response to treatment
• Stem and progenitor cells from CML patients and healthy individuals
• Chronic, accelerated, and blast phases of CML
• CML treatment (currently only tyrosine kinase inhibitors)
• Stem and progenitor cells from mouse models of CML.

The LEUKomics database was launched by scientists at the University of Glasgow and the University of Melbourne.

The website has been built as part of the stem cell database Stemformatics, with funding from the Scottish Cancer Foundation and Bloodwise.

“Thanks to research, most patients with CML will now live a normal life by taking a single pill,” said Alasdair Rankin, Director of Research at Bloodwise in London, England.

“But treatment is life-long, and not everyone can tolerate the side effects from their treatment or may not respond and see their CML return. There remains a need to develop a permanent cure for all people with this blood cancer. LEUKomics is a highly innovative way to speed up this search for a cure and should be a valuable asset for the global blood cancer research community. We look forward to seeing its impact in the months to come.”

The LEUKomics database can be accessed at: www.stemformatics.org/leukomics.