OGG1 and type 2 diabetes mellitus: hOGG1 enzyme levels were significantly decreased in patients with T2D from stage 2, 0.08(0.063-0.082) ng/mL vs. 0.37(0.18-0.36) ng/mL, (p=0.006) and in stage 3 with T2D 0.09(0.08-0.11) ng/mL vs. 0.53(0.07-0.96) ng/mL without T2D (p=0.007).