SOD2 and diabetes mellitus: No statistically significant differences in allele frequencies were found in all SNPs of the studied genes in the patients with microangiopathy when compared with patients without vascular complications (C allele in SOD1 was 0,47 in MI group vs. 0,42 in DM group without complications, p = 0,118, T allele in SOD2 was 0,35 in MI group vs. 0,39 in DM group without complications, p = 0,242).