Evaluation of Bladder Cancer in Opium Addicted Patients in the Kerman Province, Iran, from 1999 to 2003.

Background: it seems that there may be a relation between opium addiction and bladder cancer. this study has been performed to find this relationship in kerman province. methods: we evaluated opium addiction in 150 patients with bladder cancer (study group) and150 tumor-free patients (control group) and compared them by two-tailed t-test and x^2 test. results: the rate, duration, amounts and methods of opium abusing in the study group were significantly higher than control group. conclusion: the results suggest that the carcinogenic effects of opium addiction may be related to the amount, duration and the method of opium abuse.