HLA-DRB1 and type 2 diabetes mellitus: The incidence of HLA-DRB1*1501 was found to be significant in type 2 diabetes and non-diabetic ASO-positive patients compared to controls (control vs. ASO-negative diabetic patients, 11.6% vs. 35.5%, P < 0.05; control vs. ASO-positive diabetic patients, 11.6% vs. 60.7%, P < 0.01; control vs. non-diabetic ASO-positive patients, 11.6% vs. 52.9%, P < 0.05).