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To evaluate the impact of killer immunoglobulin-like receptor (KIR) genotyping in allogeneic hematopoietic stem cell transplantation for myeloid disorders at our institution, retrospective KIR genotyping was performed on 77 patients and their 10/10 matched unrelated donors. In a multivariate model including donor age,  HLA-DPB1  permissiveness, and presence of donor KIR B/x, an association with overall survival was observed ( p  = .047). Within the model, increasing donor age increased risk (RR 1.03 [1.00–1.06]/year,  p  = .046), while donor KIR and  HLA-DPB1  permissiveness were not associated with risk (RR 0.51 [0.26–1.03] and RR 0.68 [0.34–1.36]). Grouping recipients by conditioning regimen or limiting the analysis to recipients of peripheral blood stem cells, no association between donor KIR and survival or relapse was identified. No significant associations were observed between overall survival, relapse, grade III-IV acute, or chronic graft versus host disease and presence of KIR B (B/x), quantity of donor KIR B haplotype motifs, or centromeric KIR type (all  p  &gt; .05).

Clinical impact of KIR haplotypes in 10/10 HLA-matched unrelated donor-recipient pairs undergoing allogeneic hematopoietic stem cell transplantation