HLA matching is a critical factor for successful allogeneic hematopoietic stem cell transplantation. For unrelated donor searches, matching is usually based on high-resolution typing at five HLA loci, looking for a 10/10 match. Some studies have proposed that further matching at the haplotype level could be beneficial for clinical outcome. In this study, we determined the phased haplotypes of 291 patients using family members and segregation analysis. The sum of ranks of the haplotypes carried by patients was used as a surrogate predictor of a successful unrelated donor search. The putative impact of haplotypes was then analyzed in a cohort of 211 recipients transplanted with 10/10 matched unrelated donors. A logistic regression analysis showed a highly significant effect of the haplotypes in the outcome of a search, but we did not find any significant effect on overall survival, graft versus host disease or relapse/progression following HSCT. This study provides useful data for the optimization of unrelated bone marrow donor searches, but does not confirm previous reports that matching at the haplotype level has a clinical impact following HSCT. Due to the extreme polymorphism of HLA genes, further studies are warranted to better understand the many factors at play.
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This study was supported by the Swiss National Science Foundation (grant #310030_173237/1), the Academic Society of the University of Geneva, the Ernest Boninchi Foundation (grant 2016 to AS-M), IRGHET (International Research Group on unrelated Hematopoietic stem cell Transplantation), the Dr Henri Dubois-Ferrière Dinu Lippatti foundation and the Philantropy Settlement.
Conflict of interest
The authors declare that they have no conflict of interest.
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