CA9 and neoplasm: After analysis, we obtained: clinical T stage of bladder urothelial carcinoma (OR = 0.446, 95%Cl: 0.241–0.826, P = 0.01), degree of differentiation (OR = 0.501, 95%Cl: 0.262–0.956, P = 0.036)),the number of tumors (OR = 0.502, 95%Cl: 0.266–0.947, P = 0.033) and CA-IX expression intensity (OR = 2.325, 95%Cl: 1.157–4.673, P = 0.018) were independent influencing factors for predicting the recurrence of bladder urothelial carcinoma after resection (P < 0.05); Tumor diameter (OR = 1.241, 95%Cl: 0.651–2.364, P = 0.512) was not statistically significant with recurrence after resection (P > 0.05).