HLA-B and type 1 diabetes mellitus: HLA-B was also associated with DR in African and Caucasian in T1DM.32,33 In terms of classical HLA alleles, the HLA-B alleles showing significant association with PDR in the present study are HLA-B*07:02 (p = 0.0155) and HLA-B*45:01 (p = 0.0171).