Clinical importance of GVL mismatch combinations in HLA-DP mismatch. Kaplan-Meier estimates of survival according to HLA-DPB1 mismatch status. The solid line indicates HLA-DPB1 matched pairs; the short broken line, HLA-DPB1 1 allele mismatched but not GVL mismatch combinations; and the dotted line, HLA-DPB1 1 allele mismatched (GVL mismatch combinations). All groups are HLA-A, -B, -C, -DRB1, and -DQB1 matched pairs.