Cumulative incidence of grade 2 to 4 acute GVHD by common HLA haplotype. The endpoint was the time to diagnosis of grade 2 to 4 acute GVHD with censoring of date of death until 100 days after transplantation. P value was calculated with the log-rank test. (A) Patients with or without HP-P1. (B) Patients with or without HP-P2. (C) Patients with or without HP-P3.