INS and type 2 diabetes mellitus: Among the T2DM patients, the serum soluble EGFR level was positively correlated with age (P < 0.001), BMI (P = 0.009), waist circumference (P = 0.042), and FBG level (P = 0.003), fasting serum insulin level (P = 0.034), C-peptide level (P = 0.012), HOMA-IR (P = 0.004), HbA1c level (P < 0.001), T-Chol level (P < 0.001), LDL-Chol level (P = 0.040), TG level (P = 0.001), and γGTP level (P = 0.029) (Table 2).