In the present study, the mean serum IgA level was higher in the uncontrolled DM group (802.51 ± 70.00 mg/dL) compared to the controlled DM (753.23 ± 85.51 mg/dL) and non-diabetic (519.38 ± 75.41 mg/dL) groups. This evidence concerns the gene CD79A and diabetes mellitus.