In contrast to these studies, McQueen et al. reported that KIR haplotype A/A patients with AML/MDS receiving KIR haplotype B grafts (containing aKIR) had a lower survival together with a higher relapse and GvHD rates, compared to KIR haplotype A/A donors receiving a KIR haplotype A/A graft (89). This evidence concerns the gene KIR3DL1 and myelodysplastic syndrome.