The incidence of GVHD for patients with and without KIR ligand incompatibility. (A) Cumulative incidence estimates for the probability of acute GVHD grade II-IV. (B) Cumulative incidence estimates for the probability of acute GVHD grade III-IV. (C) Cumulative incidence estimates for the probability of extensive chronic GVHD. (D) Cumulative incidence estimates for the probability of GVHD-related mortality.