Posttransplantation outcome in the HLA-DRB1 matched patients based on HLA-A and HLA-B match status. (A) Probability of developing grades III to IV acute GvHD. The log-rank test from Kaplan-Meier of major versus minor mismatch did not detect a significant difference (P = .474). (B) Kaplan-Meier survival of the DRB1-matched patients according to HLA-A and HLA-B match status. The log-rank test from Kaplan-Meier of major versus minor mismatch did not detect a significant difference (P = .469).