KIR3DL1 and myelodysplastic syndrome: This large study of patients with MDS and secondary AML adds to the growing body of data by showing that the KIR KIR-ligand combinations, KIR2DS1-C2 and KIR3DL1-Bw4(80I/T) and putative haplotype motif based models have no impact on the risk of relapse and mortality after unrelated donor alloHCT.