Abstract
To elucidate the impact of infused CD34+ cell doses on transplant outcome, we retrospectively analyzed 851 adult patients who received peripheral blood stem cell transplantation (PBSCT) from human leukocyte antigen (HLA)-matched related donors. The patients were divided into high- and low-CD34 groups at the cutoff value of 4.5 × 106/kg. Overall, the high CD34 group showed early neutrophil and platelet recovery. Stratification of disease risks demonstrated that among the patients with low-risk diseases, the high-CD34 group showed better disease-free survival (DFS) (64.9% vs. 55.5%, P = 0.0415) than did the low-CD34 group, without any increase in graft-versus-host disease (GVHD). Meanwhile, a higher CD34+ cell dose had no impacts on the outcomes of patients with high-risk diseases. Multivariate analyses for the patients with low-risk diseases revealed that a high CD34+ cell dose (hazard ratio [HR] 0.72, P = 0.048) and development of grade III-to-IV acute GVHD (HR 1.64, P = 0.018) were significantly associated with DFS. An excessive dose of CD34+ cells (>8.0 × 106/kg) led to an increase in acute GVHD. By stratification of disease risk, a CD34+ cell dose between 4.5 and 8.0 × 106/kg can be suggested for patients with low-risk diseases who undergo PBSCT from HLA-matched related donors.
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Acknowledgements
We thank the all the staff members of the collaborating institutes of the Japan Society for Hematopoietic Cell Transplantation. We appreciate Flaminia Miyamasu for English proofreading.
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MK reports grants from Astellas Pharma Inc., grants from MSD KK, Eisai Co., Ltd, Otsuka Pharmaceutical Co., Ltd., ONO PHARMACEUTICAL CO., LTD, Takeda Pharmaceutical Company Limited., Chugai Pharmaceutical Company, Sumitomo Dainippon Pharma Co.,Ltd, Kyowa Hakko Kirin Co., Ltd, Nippon Shinyaku Co., Ltd, Bristol-Myers Squibb, Pfizer Japan Inc., Teijin Limited, TOYAMA CHEMICAL CO., LTD, and Novartis Pharma KK, and personal fees from Celgene KK and Shionogi & Co., Ltd, outside the submitted work.
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Yokoyama, Y., Maie, K., Fukuda, T. et al. A high CD34+ cell dose is associated with better disease-free survival in patients with low-risk diseases undergoing peripheral blood stem cell transplantation from HLA-matched related donors. Bone Marrow Transplant 55, 1726–1735 (2020). https://doi.org/10.1038/s41409-020-0817-5
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DOI: https://doi.org/10.1038/s41409-020-0817-5
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