Weak correlations were found between serum CgA levels and known diabetes duration, DBP, HbA1c, sCr, BUN, and eGFR (all P < 0.05), but there was no correlation between serum CgA levels and age, SBP, FBG, sUA, TC, TG, LDL-C, or HDL-C in patients with T2DM. The gene discussed is CGA; the disease is type 2 diabetes mellitus.