By the Pearson correlation analysis, serum ecSOD activity was significantly correlated with CYS-C (r = −0.39, P < 0.001), age (r = −0.37, P < 0.001), duration of T2DM (r = −0.19, P = 0.001), Cr (r = −0.18, P = 0.001), BUN (r = −0.17, P = 0.002), HbA1c (r = −0.16, P = 0.002), TC (r = 0.15, P = 0.005), TG (r = 0.12, P = 0.027), and LDL-C (r = 0.11, P = 0.038) (Figure 1). This evidence concerns the gene SOD3 and type 2 diabetes mellitus.