KIR3DL1 and acute graft versus host disease: Conversely, in the RIC group, KIR-L mismatch was associated with significantly higher rates of grades II–IV (79 vs. 57%, p = 0.01) and grades III–IV (42 vs. 13%, p ≤ 0.01) acute GVHD, worse TRM (27 vs. 12%, p = 0.03), and OS (32 vs. 52%, p = 0.03).