Abstract
The present study was conducted to determine the recommended dose (RD) of cyclophosphamide (CPM) in the CBD regimen, a triplet combination of CPM, bortezomib (BTZ), and dexamethasone (Dex), for relapsed and/or refractory multiple myeloma (RRMM). Patients received intravenous CPM on days 1 and 8 at one of three dose levels: 300, 400, or 500 mg/m2, with dose escalation in a 3 + 3 design. BTZ at 1.3 mg/m2 was given twice weekly in 3-week cycles, with Dex at 20 mg/m2 on the day of and day after BTZ. Of 16 patients enrolled, 15 eligible patients were allocated to the study. Dose-limiting toxicities (DLTs) were seen in two patients: one in dose level 1 with increased γ-GTP and the other in dose level 3 with increased γ-GTP and ALT. Both patients spontaneously recovered from DLT. Neither therapy-related mortality nor severe adverse events were reported during the study. Therefore, the RD of CPM was determined as 500 mg/m2. Overall, 2 (13.3 %), 1 (6.7 %), and 8 (53.3 %) patients achieved CR, VGPR, and PR, respectively. The regimen was well tolerated and showed promising activity in patients with RRMM.
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Acknowledgments
This study was supported by the Center for Supporting Hematology-Oncology Trials (C-SHOT). The authors would like to thank Shizuka Kobayashi for assisting as a data manager.
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K. Yamamoto has received honoraria from Takeda Pharmaceutical Company Limited, and Janssen Pharmaceutical Company Limited, and research funding from Takeda Pharmaceutical Company Limited. K. Shimizu is a speaker’s bureau of Janssen Pharmaceutical Company Limited. I. Sugiura, S. Terabe, T. Kinoshita, M. Sawa, Y. Ozawa, Y. Atsuta, and R. Suzuki declare that they have no conflict of interest.
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Sugiura, I., Terabe, S., Kinoshita, T. et al. Phase I dose-escalation study of cyclophosphamide combined with bortezomib and dexamethasone in Japanese patients with relapsed and/or refractory multiple myeloma. Int J Hematol 102, 434–440 (2015). https://doi.org/10.1007/s12185-015-1846-5
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DOI: https://doi.org/10.1007/s12185-015-1846-5