Adjusted Effect of HLA-A, -B, -DRB1 Haplotype Mismatching on Risks of Grades III–IV Acute GVHD, Recurrent Malignancy, Transplant-Related Mortality, and Mortality after HCT from HLA-Identical Unrelated Donors. This evidence concerns the gene HLA-DRB1 and acute graft versus host disease.