In their case-control study, which included a total of 182 participants, including 84 unrelated patients with T2D and an age-matched control group consisting of 98 unrelated individuals without T2D, they evaluated the influence of GSTM1, GSTT1, and GSTP1 variants on T2D and DPN risk. Here, GSTM1 is linked to type 2 diabetes mellitus.