Besides, IL-10 −819C>T polymorphism was significantly correlated with bladder cancer risk in CC versus CT (P = 0.03, OR 0.71, 95% CI 0.52–0.96), CC versus TT (P = 0.0005, OR 0.57, 95% CI 0.41–0.78), CC versus CT+TT (P = 0.002, OR 0.63, 95% CI 0.47–0.84), and C versus T (P < 0.00001, OR 0.72, 95% CI 0.61–0.84). Here, IL10 is linked to urinary bladder carcinoma.