泌尿系肿瘤中以膀胱癌最为多见,但其病因至今未明。在可追出有明确诱因的病人中,与环境因素有关者约占50%。如染料工业所用之β-萘酸、联苯胺等物质,吸烟,滥用非那西汀类药物,均可致α-萘酸经尿路排泄量增多而致病。近来发现人工甜味剂亦与膀胱癌的发生有关,埃及血吸虫可致膀胱鳞癌,宿主本身的某些因素在膀胱癌的发病由亦 Urinary bladder cancer is the most common bladder cancer, but its etiology has not yet been identified. About 50% of the patients who can recover a clear incentive are environmental factors. Such as the dye industry β-naphthoate, benzidine and other substances, smoking, abuse of phenacetin drugs, can cause α-naphthoate increased urinary tract excretion caused by disease. Recently, artificial sweeteners have also been found associated with the occurrence of bladder cancer, schistosomiasis can cause bladder squamous cell carcinoma, some of the host itself in the incidence of bladder cancer from