KIR3DL1 and acute lymphoblastic leukemia: In fact, more recently, in the evaluation of the KIR genotype, we started to consider the proposed centromeric and telomeric KIR score (ct-KIR score) reported to correlate Cen B/x and Tel A/A donor KIR repertoires with low relapse risk in ALL pediatric patients undergoing allo-HSCT [61].