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Matched related versus unrelated versus haploidentical donors for allogeneic transplantation in AML patients achieving first complete remission after two induction courses: a study from the ALWP/EBMT

Abstract

We compared transplants (HSCT) from matched related siblings (MSD) with those from matched 10/10 and mismatched 9/10 unrelated (UD) and T-replete haploidentical (Haplo) donors in acute myeloid leukemia (AML) in first complete remission (CR1) achieved after two inductions, a known poor prognostic factor. One thousand two hundred and ninety-five patients were included: MSD (n = 428), UD 10/10 (n = 554), UD 9/10 (n = 135), and Haplo (n = 178). Acute GVHD II–IV was higher in all groups compared to MSD. Extensive chronic (c) GVHD was significantly higher in UD 9/10 (HR = 2.52; 95% CI 1.55–4.11, p = 0.0002) and UD 10/10 (HR = 1.48; 95% CI 1.03–2.13, p = 0.036) and cGVHD all grades were higher in UD 9/10 vs MSD (HR = 1.77; 95% CI 1.26–2.49, p = 0.0009). Non-relapse mortality was higher in all groups compared to MSD. Relapse incidence, leukemia-free, and overall survival did not differ significantly between donor types. Finally, GVHD-free relapse-free survival was lower in HSCT from UD 9/10 (HR = 1.56, 95% CI 1.20–2.03, p = 0.0009) but not in those from UD 10/10 (HR = 1.13, p = 0.22) and Haplo donors (HR = 1.12, p = 0.43) compared to MSD. In conclusion, in AML patients undergoing HSCT in CR1 achieved after two induction courses 10/10 UD and Haplo but not 9/10 UD donors are comparable alternatives to MSD.

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Fig. 1: Five-year transplantation outcome in patients with acute myeloid leukemia achieving first complete remission after two induction courses: matched related versus matched or mismatched unrelated versus haploidentical donors.

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AN, ML and MM had full access to all study data (available upon data-specific request).

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Acknowledgements

We thank all the EBMT centers and national registries for contributing patients to this study (Supplementary Appendix material). We also thank the data managers for their excellent work.

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AN wrote the manuscript, designed the study, and interpreted the data. ML designed the study, performed the statistical analyses, interpreted the data, and edited the manuscript. MM designed the study, interpreted the data, and edited the manuscript. SM, JP, DB, TG-D, JJC, US, IY-A, PR, GS, GvG, HL-W, X-JH, MTR JB, CC, LG, and FC reviewed the manuscript and provided clinical data. All authors approved the final version of the manuscript.

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Correspondence to Arnon Nagler.

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Nagler, A., Labopin, M., Mielke, S. et al. Matched related versus unrelated versus haploidentical donors for allogeneic transplantation in AML patients achieving first complete remission after two induction courses: a study from the ALWP/EBMT. Bone Marrow Transplant 58, 791–800 (2023). https://doi.org/10.1038/s41409-023-01980-y

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