Liu et al. [20] examined 200 patients with T2D who underwent renal biopsy and constructed a new diagnostic model as follows: PDN = exp (0.846 + 0.022 Dm + 0.033Bp + 2.050 Gh − 2.664 Hu − 0.078 Hb + 2.942Dr)/[1 + exp (0.846 + 0.022 Dm + 0.033 Bp + 2.050 Gh − 2.664 Hu − 0.078 Hb + 2.942 Dr)]. Here, GSTM1 is linked to type 2 diabetes mellitus.