Abstract
Graft failure and delayed hematopoietic recovery are the major limitations of cord-blood transplantation (CBT). Romiplostim, a thrombopoietin-receptor agonist, promotes megakaryopoiesis and multilineage hematopoiesis in aplastic anemia. The decreased number of hematopoietic stem cells in the early phase after CBT and aplastic anemia share certain characteristics. Therefore, we hypothesized that romiplostim administration immediately after CBT may promote multilineage hematopoietic recovery. We investigated the safety and preliminary efficacy of administering romiplostim a day after CBT. This phase 1 dose-escalation study included six adults with hematologic malignancies in remission. Romiplostim was administered subcutaneously within 7 days after single-unit CBT, initially at doses of 5 µg/kg or 10 µg/kg in three patients, then once a week for 14 weeks or until platelet recovery. The maximum dose was 20 µg/kg. The median number of romiplostim administrations was 6 (range, 3–15). Romiplostim-related adverse events included bone pain (3/6) and injection site reaction (1/6). Non-hematological grade ≥ 3 toxicities were observed in four patients; febrile neutropenia was the most common (4/6). All patients achieved neutrophil engraftment and the median time was 14 days (range, 12–32). Platelet counts ≥ 50 × 109 /L were recorded in all patients except for one who died on day 48; the median time was 34 days (range, 29–98). No relapse, thrombosis, or bone marrow fibrosis was observed during a median follow-up of 34 months. Romiplostim may be safely administered in the early phase of CBT. Further phase 2 trial is warranted for its efficacy evaluation. Trial registration number: UMIN000033799, August 18, 2018.
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Data availability
The datasets generated and analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
This study was supported by the Grant for Implementation of Advanced Medicine at the University of Tsukuba Hospital. The authors would like to thank the study participants. This study received generous support from Toshihiro Kikuchi in designing the trial. We thank all staff of the Tsukuba Clinical Research and Development Organization (T-CReDO) for their invaluable assistance with data collection and quality management. We thank Editage (www.editage.jp) for the grammatical review and advice.
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This study was supported by the Grant for Implementation of Advanced Medicine at the University of Tsukuba Hospital.
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NK designed and conducted the study, interpreted the data, and wrote the manuscript. HN, YM, YS, KH, TS, TK, YY, NO, and MS-Y conducted the study and reviewed the manuscript. KM, TO, HY, TI, HM, and KH performed data collection and quality management. RM performed the pathological examination. The first draft of the manuscript was written by NK and all authors commented on previous versions of the manuscript. SC designed and supervised the project and reviewed the manuscript. All authors read and approved the final manuscript.
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The study was approved by the institutional review board of University of Tsukuba Hospital (approval #I-27). UMIN Clinical Trials Registry identifier: UMIN000033799.
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Written informed consent was obtained from all patients in accordance with the Declaration of Helsinki.
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The study was sponsored by Kyowa Kirin Co., Ltd., which provided the study drug to the participants free of charge. The authors declare that no funding or sponsoring agency played any role in the study design, patient enrollment, data acquisition/analysis, manuscript drafting, or the decision to publish this study. MS-Y received research funding from Eisai, Bristol Myers Squibb, and Otsuka. SC received research funding from Kyowa Kirin, Chugai, Ono, Astellas, Beyer, Eisai, and Thyas. The other authors have no conflict of interest to declare.
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Kurita, N., Nishikii, H., Maruyama, Y. et al. Safety of romiplostim administered immediately after cord-blood transplantation: a phase 1 trial. Ann Hematol 102, 2895–2902 (2023). https://doi.org/10.1007/s00277-023-05410-3
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DOI: https://doi.org/10.1007/s00277-023-05410-3