It is hypothesized that the strongest candidates for increasing T1DM risk among DR3-DQB1*0201/DR4-DQB1*0302 individuals is of alleles of DP and DRB1*04 subtypes and, in particular, the absence of reportedly protective alleles DPB1*0402 and/or DRB1*0403 [26]. The gene discussed is HLA-DRB1; the disease is type 1 diabetes mellitus.