EFS according to NK cell alloreactivity and to specific KIR ligand mismatches. (A) EFS after transplantation from NK-alloreactive donors versus non-NK alloreactive donors in the entire series of 112 haploidentical transplant recipients. (B) EFS after transplantation from NK-alloreactive donors according to the specific donor KIR ligand that was missing in the recipient. Solid line indicates HLA-C 1; dotted line, HLA-C 2; broken line, HLA-Bw4.