Abstract
The effects of donor characteristics on outcomes after T-cell-replete (TCR) haploidentical donor peripheral blood stem cell transplantation (PBSCT) with post-transplant cyclophosphamide (PTCy) or low-dose antithymocyte globulin (ATG) remain unclear. We evaluated the impact in 1,677 patients who received a PTCy protocol (PTCy-haplo; n = 1,107) or low-dose ATG protocol (ATG-haplo; n = 570). A low CD34+ cell dose (<4 ×106/kg) was the only donor characteristic associated with worse overall survival (OS) after PTCy-haplo (adjusted hazard ratios [aHR] = 1.49, P = 0.008), whereas increasing donor age by decade (aHR = 1.12, P = 0.008) and human leukocyte antigen 2-3 antigen mismatches (aHR = 1.46, P = 0.010), compared to HLA 0-1 antigen mismatches, were associated with worse OS after ATG-haplo. Increasing donor age was associated with a high risk of grade III–IV acute GVHD both after PTCy-haplo (HR: 1.32, P = 0.009) and ATG-haplo (HR: 1.22, P = 0.006). Offspring donors had better relapse-free survival and GVHD-free relapse-free survival than sibling donors after ATG-haplo. Our data highlights the donor characteristics associated with improved transplant outcomes after TCR haploidentical donor PBSCT with PTCy or low-dose ATG.
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Data availability
The data that support the findings of this study are available from the corresponding author, JK, upon reasonable request.
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Acknowledgements
We thank all the physicians and data managers at the centers who contributed to the collection of data on transplantation for the Japanese Society for Transplantation and Cellular Therapy (JSTCT) and the Transplant Registry Unified Management Program (TRUMP) 2. We also thank the members of the Data Management Committees of the JSTCT and TRUMP for their assistance.
Funding
This work was supported in part by the Takeda Science Foundation (JK) and JSPS KAKENHI Grant number 24K11515 (JK).
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F.W. and J.K. designed the study, reviewed and analyzed data, and wrote the first draft of the manuscript. M.I., M.H., K.K. (Koji Kawamura), and H.N. interpreted data and revised the manuscript; and K.K. (Katsuji Kaida), N.D., H.N., Y.H., T.F., T.E., N.H., Y.M., K.N., S.O., J.I., T.A., T.I., and Y.A. contributed to data collection. All authors approved the final version.
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This study was approved by the Data Management Committee of the Japanese Data Center for Hematopoietic Cell Transplantation (JDCHCT) and the Ethics Committee of Kyoto University (approval number: R1437).
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Wada, F., Iwasaki, M., Hirayama, M. et al. Donor selection in T-cell-replete haploidentical donor peripheral blood stem cell transplantation. Leukemia 39, 951–961 (2025). https://doi.org/10.1038/s41375-025-02538-1
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DOI: https://doi.org/10.1038/s41375-025-02538-1