CA9 and bladder transitional cell carcinoma: Bladder urothelial carcinoma recurrence after TURBT had statistical significance (P < 0.05) with T stage (OR = 0.41, 95%Cl: 0.227–0.739, P = 0.003), degree of differentiation (OR = 0.511, 95%Cl: 0.279–0.935, P = 0.029), CA-IX expression (OR = 2.396, 95%Cl: 1.233–4.654, P = 0.01).