Abstract
HLA-haploidentical allogeneic hematopoietic stem cell transplantation (Haplo-HCT) is frequently used as treatment for patients with active acute myeloid leukemia (AML). Here, we investigated whether 9/10 HLA-mismatched unrelated donor transplantation (MMUD-HCT) with post-transplant cyclophosphamide (PTCy) is an adequate alternative. Inclusion criteria in this retrospective registry study consisted of adult patients, first HCT with a Haplo donor or MMUD between 2010 and 2020 using PTCy as graft-versus-host disease (GVHD) prophylaxis, and primary refractory or relapsed disease. MMUD patients were pair-matched 1 to 2 with Haplo-recipients. A total of 73 MMUD patients met the inclusion criteria. Their data were compared to those of 146 Haplo patients in a matched-pair analysis. Median follow-up was 27 months in MMUD patients and 36 months in Haplo recipients. Two-year incidences of relapse and non-relapse mortality (NRM) were 40% and 18% in MMUD patients, respectively, versus 50% (P = 0.23) and 24% (P = 0.18) in Haplo recipients. Two-year leukemia-free survival (LFS) and overall survival (OS) was 42% and 46% in MMUD recipients, respectively, versus 26% (P = 0.1) and 28% (P = 0.061) in Haplo-patients. In conclusions, in AML patients with active disease at transplantation, MMUD-HCT results in at least comparable outcomes to Haplo-HCT when PTCy is applied.
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Data availability
ML and MM had full access to all the data in the study. Data are available upon reasonable request. Please contact Dr Myriam Labopin (myriam.labopin@upmc.fr).
Change history
24 October 2022
A Correction to this paper has been published: https://doi.org/10.1038/s41409-022-01856-7
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Acknowledgements
We thank Emmanuelle Polge from the office of the ALWP of the EBMT. FB is Senior Research Associate at the National Fund for Scientific Research (FNRS) Belgium. FB is senior research associate at the FNRS.
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FBa 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 and AN designed the study, interpreted the data, and edited the manuscript. JT, FC, AMR, DB, SS, JV, RF, JLDM, CEB, FS, ABu, PJ, YK, PC, EF, WR, JP, AK, AMC, CS, Aba, and PP reviewed the manuscript and provided clinical data. All authors approved the final version of the manuscript.
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FB has received travel grants and/or speaker honoraria from Pfizer, Celgene, Abbvie, Novartis and Sanofi. The other authors declare that they have no relevant conflict of interest.
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The original online version of this article was revised: The black and white version of the figures contained a mistake. The labels (« MMUD » and « Haplo ») of the curves were inverted. The author apologize for this error.
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Baron, F., Labopin, M., Tischer, J. et al. Comparison of HLA-mismatched unrelated donor transplantation with post-transplant cyclophosphamide versus HLA-haploidentical transplantation in patients with active acute myeloid leukemia. Bone Marrow Transplant 57, 1657–1663 (2022). https://doi.org/10.1038/s41409-022-01781-9
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DOI: https://doi.org/10.1038/s41409-022-01781-9