KIR3DL1 and acute myeloid leukemia: In a study with over 1000 AML patients, receiving grafts from KIR haplotype B donors, in particular KIR cen-B homozygous donors, was associated with a higher relapse-free survival, compared to those receiving grafts from KIR haplotype A/A donors, which lack most aKIRs (87, 88).