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US Intergroup Study of Chemotherapy Plus Dasatinib and Allogeneic Stem Cell Transplant in Philadelphia Chromosome Positive ALL.

ABSTRACT: This multicenter trial was conducted to determine whether the addition of dasatinib to chemotherapy followed by an allogeneic hematopoietic cell transplant (HCT) in patients with Philadelphia chromosome positive (Ph+) acute lymphoblastic leukemia (ALL) was feasible. Patients ? 18 and ? 60 years of age with newly diagnosed Ph+ ALL received up to 8 cycles of alternating hyperCVAD and high dose cytarabine and methotrexate with dasatinib. Patients with an available matched sibling or unrelated donor underwent an allogeneic HCT in first complete remission (CR1) followed by daily dasatinib starting from day 100. Others received maintenance therapy with vincristine and prednisone for 2 years and dasatinib indefinitely. 97 patients (94 evaluable) with median age of 44 years (range, 20 - 60) and median WBC at presentation of 10 × 10⁹/L (range, 1 - 410 × 10⁹/L) were accrued. 83 (88%) patients achieved CR or CR with incomplete count recovery (CRi) and 41 underwent ASCT in CR1. Median follow-up is 36 months (range, 9 - 63). For the overall population, overall survival (OS), event-free survival (EFS), and relapse-free survival (RFS) at 3 years were 69%, 55%, and 62%, respectively. The 12-month RFS and OS after transplant were 71% and 87%, respectively. Landmark analysis at 175 days from the time of CR/CRi (longest time to HCT), showed statistically superior advantages for RFS and OS (p=0.038 and 0.037, respectively) for the transplanted patients. Addition of dasatinib to chemotherapy and HCT for younger patients with Ph+ ALL is feasible and warrants further testing.

SUBMITTER: Ravandi F

PROVIDER: S-EPMC5642915 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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US Intergroup Study of Chemotherapy Plus Dasatinib and Allogeneic Stem Cell Transplant in Philadelphia Chromosome Positive ALL.

Ravandi Farhad F Othus Megan M O'Brien Susan M SM Forman Stephen J SJ Ha Chul S CS Wong Jeffrey Y C JYC Tallman Martin S MS Paietta Elisabeth E Racevskis Janis J Uy Geoffrey L GL Horowitz Mary M Takebe Naoko N Little Richard R Borate Uma U Kebriaei Partow P Kingsbury Laura L Kantarjian Hagop M HM Radich Jerald P JP Erba Harry P HP Appelbaum Frederick R FR

Blood advances 20161201 3

This multicenter trial was conducted to determine whether the addition of dasatinib to chemotherapy followed by an allogeneic hematopoietic cell transplant (HCT) in patients with Philadelphia chromosome positive (Ph+) acute lymphoblastic leukemia (ALL) was feasible. Patients ≥ 18 and ≤ 60 years of age with newly diagnosed Ph+ ALL received up to 8 cycles of alternating hyperCVAD and high dose cytarabine and methotrexate with dasatinib. Patients with an available matched sibling or unrelated donor ...[more]

PMID: 29046900

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Project description:Purpose Addition of imatinib to intensive chemotherapy improved survival for children and young adults with Philadelphia chromosome-positive acute lymphoblastic leukemia. Compared with imatinib, dasatinib has increased potency, CNS penetration, and activity against imatinib-resistant clones. Patients and Methods Children's Oncology Group (COG) trial AALL0622 (Bristol Myers Squibb trial CA180-204) tested safety and feasibility of adding dasatinib to intensive chemotherapy starting at induction day 15 in patients with newly diagnosed Philadelphia chromosome-positive acute lymphoblastic leukemia age 1 to 30 years. Allogeneic hematopoietic stem-cell transplantation (HSCT) was recommended for patients at high risk based on slow response and for those with a matched family donor regardless of response after at least 11 weeks of therapy. Patients at standard risk based on rapid response received chemotherapy plus dasatinib for an additional 120 weeks. Patients with overt CNS leukemia received cranial irradiation. Results Sixty eligible patients were enrolled. Five-year overall (OS) and event-free survival rates (± standard deviations [SD]) were 86% ± 5% and 60% ± 7% overall, 87% ± 5% and 61% ± 7% for standard-risk patients (n = 48; 19% underwent HSCT), and 89% ± 13% and 67% ± 19% for high-risk patients (n = 9; 89% underwent HSCT), respectively. Five-year cumulative incidence (± SD) of CNS relapse was 15% ± 6%. Outcomes (± SDs) were similar to those in COG AALL0031, which used the same chemotherapy with continuous imatinib: 5-year OS of 81% ± 6% versus 86% ± 5% ( P = .63) and 5-year disease-free survival of 68% ± 7% versus 60% ± 7% ( P = 0.31) for AALL0031 versus AALL0622, respectively. IKZF1 deletions, present in 56% of tested patients, were associated with significantly inferior OS and event-free survival overall and in standard-risk patients. Conclusion Dasatinib was well tolerated with chemotherapy and provided outcomes similar to those with imatinib in COG AALL0031, where all patients received cranial irradiation. Our results support limiting HSCT to slow responders and suggest a potential role for transplantation in rapid responders with IKZF1 deletions.

Dataset Information

US Intergroup Study of Chemotherapy Plus Dasatinib and Allogeneic Stem Cell Transplant in Philadelphia Chromosome Positive ALL.

Publications

US Intergroup Study of Chemotherapy Plus Dasatinib and Allogeneic Stem Cell Transplant in Philadelphia Chromosome Positive ALL.

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