Abstract
This 3+3 dose-escalation phase I multicenter study investigated the optimal dose of azacitidine (AZA) for post-hematopoietic stem cell transplantation (HSCT) maintenance, which remains unknown in Japan. Recipients of a first HSCT for high-risk myelodysplastic syndromes (MDS, n = 12) or acute myeloid leukemia (AML) with antecedent MDS (n = 3) received post-HSCT AZA maintenance in 2015–2019. The optimal AZA dose was defined as the dose at which 50–70% of patients can complete four cycles without dose-limiting toxicity (DLT). The initial dose level 1 was set as 30 mg/m2 for 5 days per 28-day cycle, and dose levels 0, 2, and 3 were set as 20, 40, and 50 mg/m2. DLT was defined as any grade 3 non-hematological or grade 4 hematological toxicity. The 15 evaluable patients were 55 (37–64) years old. The median observation of the post-HSCT survivors was 935 (493–1915) days. The median number of days post-HSCT to the start of AZA was 101 (59–176). In the first, second, and third cohorts, five of nine patients completed four cycles at dose level 1. In the final cohort, five of six additional patients completed at the same dose. In total, 10 (67%) patients tolerated AZA 30 mg/m2, which was determined as optimal. DLT occurred in five cases: grade 3 hepatotoxicity, pneumonia, enterocolitis, and grade 4 thrombocytopenia and neutropenia. The 2-year overall survival and disease-free survival rates post-HSCT were 77.0% and 73.3%. Post-HSCT AZA maintenance was well-tolerated and merits further evaluation for patients with MDS or AML with antecedent MDS. Trial registration: UMIN000018791
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Acknowledgements
We thank all members of the KSGCT study and the staff of the data center of the KSGCT. We also thank Dr. Gaku Oshikawa for the preparation of the initial study protocol.
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YN, T. Tachibana, YK, TI, and AY designed the study. YN and SM analyzed data. YN, T. Tachibana, YT, KT, YA, T. Toya, AI, MT, ES, RA, MO, TK, ND, and KO performed patient care. YN wrote the manuscript. All of the authors reviewed and approved the final manuscript.
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The protocol of this study was approved by the Institutional Review Board of each participating center. All procedures involving human participants were conducted in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Written informed consent was obtained from all individual participants included in the study.
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YN reports speakers’ bureau fees from Pfizer outside the submitted work. T. Tachibana reports speakers’ bureau fees from Otsuka Pharmaceutical, Novartis Pharma, Pfizer, BMS, Daiichi Sankyo, and Amgen outside the submitted work. ES reports speakers’ bureau fees and/or grants from BMS, Pfizer, Novartis Pharma, and Celgene and grants from Kyowa Kirin, Chugai Pharmaceutical, and Ono Pharmaceutical outside the submitted work. SM reports speakers’ bureau fees and/or grants from Boehringer Ingelheim, AstraZeneca, BMS, Chugai Pharmaceutical, Eli Lilly and Company, Ono Pharmaceutical, Pfizer, and Taiho Pharmaceutical outside the submitted work. SO reports speakers’ bureau fees and/or grants from Astellas Pharma, Eisai, Otsuka Pharmaceutical, Ono Pharmaceutical, Kyowa Kirin, Sanofi, Daiichi Sankyo, Takeda Pharmaceutical, Chugai Pharmaceutical, Novartis Pharma, Mochida Pharmaceutical, JCR Pharma, Pfizer Nihon Shinyaku, and BMS and grants from Asahi Kasei Pharma, Shionogi, Dainihon Sumitomo, and Teijin Pharma outside the submitted work. YK reports speakers’ bureau fees and/or grants from Astellas Pharmaceuticals, Dainihon Sumitomo, Chugai Pharmaceutical, Eisai, MSD, Pfizer, Novartis Pharma, Otsuka Pharmaceutical, and Janssen Pharmaceutical and grants from Celgene, Kyowa Kirin, Ono Pharmaceutical, Takeda Pharmaceutical, and Shionogi outside the submitted work. The other authors declare no competing financial interests.
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Key points
• This first prospective study evaluating post-transplant azacitidine (AZA) maintenance in Japanese allo-HSCT recipients revealed that four cycles of AZA 30 mg/m2 for 5 days are feasible.
• For the recipients with high-risk MDS or AML with a prior MDS history, post-transplant AZA maintenance produced a 73% disease-free survival rate at 2 years post-HSCT, Providing the basis for further clinical trials.
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Najima, Y., Tachibana, T., Takeda, Y. et al. Dose-finding trial of azacitidine as post-transplant maintenance for high-risk MDS: a KSGCT prospective study. Ann Hematol 101, 2719–2729 (2022). https://doi.org/10.1007/s00277-022-04981-x
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DOI: https://doi.org/10.1007/s00277-022-04981-x