Abstract
This phase 1/2 study aimed to identify the maximum tolerated dose, the recommended phase 2 dose (RP2D), and efficacy of the clofarabine, etoposide, and cyclophosphamide combination regimen in adult patients with relapsed/refractory acute lymphoblastic leukemia (ALL). Patients aged ≥ 15 years with relapsed/refractory ALL were enrolled. Escalating doses of clofarabine (20–30 mg/m2/day × 5 days), etoposide (50–100 mg/m2/day × 5 days), and cyclophosphamide (200–440 mg/m2/day × 5 days) were administered. Dose-limiting toxicity was defined as Grade 3 or more non-hematological toxicities and others. A total of 18 patients (B-ALL; n = 13, T-ALL; n = 5) were recruited in phase 1; however, the protocol was amended to close study without proceeding to phase 2. Three patients were enrolled in cohort 1, three in cohort 2, six in cohort 3, and six in cohort 4. The RP2D of clofarabine, etoposide, and cyclophosphamide was 30, 100, and 440 mg/m2 daily, respectively. Complete remission (CR) was achieved in four patients (22%) and CR without platelet recovery in four patients (22%), with an overall response rate of 44%. The RP2D of the combination therapy was successfully determined in this study.
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Acknowledgements
The authors thank all investigators and members of participating hospitals in ALL studies conducted by the JALSG.
Funding
This work was supported in part by a grant for Practical Research for Innovative Cancer Control Grant No. JP19ck0106331 from the Japan Agency for Medical Research and Development (AMED).
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Administrative support: all authors. Conception and design: all authors. Provision of study materials or patients: all authors. Collection and assembly of data: AMS. Data analysis and interpretation: AH. Manuscript writing: all authors. Final approval of manuscript: all authors.
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Hitoshi Kiyoi reports research funding from Chugai Pharmaceutical, Kyowa Kirin, Zenyaku Kogyo, FUJIFILM, Daiichi Sankyo, Astellas Pharma, Otsuka Pharmaceutical, Nippon Shinyaku, Eisai, Pfizer Japan, Takeda Pharmaceutical, Novartis Pharma, Sumitomo Dainippon Pharma, Sanofi, Perseus Proteomics and Celgene, and consulting fees from Astellas Pharma, Amgen Astellas BioPharma, and Daiichi Sankyo, and honoraria from Bristol-Myers Squibb, Astellas Pharma, and Novartis Pharma. Yasushi Miyazaki reports research funding from Sumitomo Dainippon Pharma, Pfizer Japan, Chugai Pharmaceutical, and Takeda Pharmaceutical, and honoraria from Chugai Pharmaceutical, Kyowa Kirin, Astellas Pharma, Otsuka Pharmaceutical, Nippon Shinyaku, Novartis Pharma, Sumitomo Dainippon Pharma, and Celgene. Other authors declare that they have no conflict of interest.
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Saito, T., Hatta, Y., Hayakawa, F. et al. Combination of clofarabine, etoposide, and cyclophosphamide in adult relapsed/refractory acute lymphoblastic leukemia: a phase 1/2 dose-escalation study by the Japan Adult Leukemia Study Group. Int J Hematol 113, 395–403 (2021). https://doi.org/10.1007/s12185-020-03032-3
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DOI: https://doi.org/10.1007/s12185-020-03032-3