GSTM1 and diabetes mellitus: The results revealed no statistically significant differences in age, sex, BMI, hypertension, diabetes, hematuria, blood transfusion, tumor side and location, T stage, lymph node involvement, LND, surgical margin, LVI, tumor histology, tumor grade, preoperative Hb, preoperative albumin, preoperative uric acid, urinary specific gravity, urinary protein, and preoperative GFR on the affected side between the two groups.