[Inhibitory effect of antitumor-B and retinamide on precancerous lesions of the bladder in rats].

The model of precancerous lesions of the bladder in rats was induced by N-butyl-(4-hydroxybutyl) nitrosamide (BBN). The animals were randomly divided into the following 3 groups: 1) given Antitumor-B (Chinese herbs); 2) given 4-ethoxycarbophenylretinamide (Retinamide); and 3) control. After treatment for 13 months the rats were killed for pathomorphological examination of the bladder. The results showed that the incidence of bladder cancer in group 1 and 2 was reduced by 90.7% (P < 0.01) and 75.0% (P < 0.01) respectively after treatment as compared with the control group. Our results provide a useful reference for clinical trial in the prevention of bladder cancer recurrence by using antitumor-B and Retinamide.