HLA-B and chronic myelogenous leukemia, BCR-ABL1 positive: Storbet al estimated that the presence of HLA-B*18 is associated with a nearly three-fold increase in aGVHD incidence, whereas in patients with HLA-B*8 or HLA-Bw35, the incidence of aGVHD decreased by half, in comparison with those without these alleles.18 The European group for Blood and Marrow Transplantation (EBMT) conducted a cohort study in CML patients who received transplantation from HLA-matched sibling donors.