after administration of a low total dose of bbn ( 300 mg/kg bodyweight ) and an experimental period of 6 , 12 , and 18 months , only 2.6 % of the rats with a partial cystectomy , but 12.6 % of the control animals with an intact bladder had developed papillomas and noninvasive papillary transitional cell carcinomas .
C0194396
partial cystectomy
C0005682
bladder