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Comparable survival outcomes with haploidentical stem cell transplantation and cord blood transplantation

Abstract

HLA-haploidentical stem cell transplantation using post-transplant cyclophosphamide (PTCy-haplo) and umbilical cord blood transplantation (UCBT) are alternative to HLA-matched stem cell transplantation. We conducted a matched-pair analysis of PTCy-haplo and UCBT using the Japanese registry data. We identified 136 patients aged between 16 and 69 years who received PTCy-haplo as their first transplantation for acute leukemia or myelodysplastic syndromes. Control group included 408 UCBT recipients selected to match the PTCy-haplo group. Overall and relapse-free survival probabilities at 2 years were comparable between the PTCy-haplo and UCBT groups: 55% vs. 53% for overall survival (p = 0.46), and 47% vs. 48% for relapse-free survival (p = 0.79), respectively. The cumulative incidence of relapse was significantly higher (43% vs. 29%, respectively, p = 0.006), while the cumulative incidence of non-relapse mortality (NRM) was significantly lower (9% vs. 23%, respectively, p < 0.001) in the PTCy-haplo group. The cumulative incidence of grade II-IV acute graft-versus-host disease (GVHD) was lower in the PTCy-haplo group compared to the UCBT group (29% vs. 41%, respectively, p = 0.016), while those of grade III-IV acute GVHD and chronic GVHD were not statistically different between the two groups. Our results suggest that both PTCy-haplo and UCBT are viable alternatives to HLA-matched stem cell transplantation.

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Fig. 1: Probabilities of overall and relapse-free survival.
Fig. 2: Cumulative incidences of relapse and non-relapse mortality.
Fig. 3: Cumulative incidences of acute and chronic GVHD.
Fig. 4: Cumulative incidences of neutrophil and platelet recovery.
Fig. 5: Probabilities of overall survival stratified by revised DRI.

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Acknowledgements

The authors are grateful for the assistance and cooperation of all the staff members at the following collaborating institutes: the Japan Society for Hematopoietic Cell Transplantation, the Japan Marrow Donor Program, and the Japanese Data Center for Hematopoietic Cell Transplantation. This work was supported in part by the Practical Research Project for Allergic Diseases and Immunology (Research Technology of Medical Transplantation) of the Japan Agency for Medical Research and Development (AMED) under Grant Numbers 19ek0510023h0002 and 19ek0510023h0002.

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JS, YA, and TT designed the study and wrote the paper; MK and YA analyzed the results and created the figures; JK, TK, and TI. reviewed and cleaned the clinical data and reviewed the results; HN, YM, KI, SS, TF, NS, YO, MM, KN, NU, MT, and MO submitted and cleaned the clinical data and reviewed the results.

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Correspondence to Takanori Teshima.

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Sugita, J., Atsuta, Y., Nakamae, H. et al. Comparable survival outcomes with haploidentical stem cell transplantation and cord blood transplantation. Bone Marrow Transplant 57, 1681–1688 (2022). https://doi.org/10.1038/s41409-022-01770-y

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