Abstract
The initiating and promoting effects of quercetin on urinary bladder carcinogenesis in male F344 rats were examined histopathologically. No tumor or hyperplasia were observed in rats given 5.0% quercetin as initiator in the diet for 4 weeks followed by 0.001% N-butyl- N-(4-hydroxybutyl) nitrosamine (BHBN) for 29 weeks. Moreover, administration of 5.0% quercetin diet for 25 weeks after initiation with 0.01% BHBN for 4 weeks did not promote urinary bladder carcinogenesis. Furthermore, no lesions were detected in rats given 5.0% quercetin diet only. These results suggest that quercetin is not carcinogenic to rat urinary bladder.
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