Objective To investigate the association between diabetes and bladder cancer risk.Methods Total 230 cases of bladder cancer and 256 population controls were involved. The association between diabetes and bladder cancer was evaluated by multivariate Logistic regression. Results Diabetes increased the risk of bladder cancer,with OR being 2. 3( 95% CI: 1. 2~ 3. 6). The risk of bladder cancer increased with the course of diabetes extending,the odds ratios( OR) of 1 ~ 4 years,5 ~ 9 yearsand≥10 yearswas 2. 1( 95%...