HLA-DRB1 and type 1 diabetes mellitus: The second-most significant allele found in HLA-DRB1 was DRB1*04:05:01 [OR (95% CI) = 4.0 (1.71–10.17), Pc = 0.005], which also confers risk of T1D in our study, along with the Saudi Arabian (28), Omani (29), Egyptian (43), and Tunisian (44, 45) populations.