Survival, relapse, and transplant-related mortality. The graphs show the Kaplan-Meier estimates of overall (A) and disease-free (B) survival in recipients of transplants from donors with or without KIR ligand incompatibility after a median follow-up of 44 months (range: 2-73 months). Probability of relapse and treatment-related mortality are depicted in (C) and (D), respectively.