Finally, a weak, positive, yet statistically significant correlation was observed between FPG or PPG and Hb (r = 0.179; p = 0.006 for FPG and r = 0.141; p = 0.034 for PPG), suggesting that T2D patients with anemia could have lower glycemic values, which was not confirmed by a significant correlation between HbA1c and Hb. Here, GSTM1 is linked to type 2 diabetes mellitus.