Abstract
The carcinogenic potential of caffeic acid, sesamol and catechol was examined in male and female F344 rats and B6C3F1 mice, groups of 30 animals being treated with diets containing 2% caffeic acid, 2% sesamol or 0.8% catechol for 104 weeks (rats) or 96 weeks (mice). Histological examination revealed that caffeic acid induced forestomach squamous cell carcinoma in 57% (P<0.001 vs. controls) and 50% (P<0.001) of male and female rats, respectively, whereas sesamol was associated with squamous cell carcinoma at incidences of 31% (P<0.001) in male rats, and 38% (P<0.001) and 17% (P<0.05) in male and female mice, respectively. Catechol induced glandular stomach adenocarcinomas in 54% (P<0.001) and 43% (P<0.001) of male and female rats, respectively. The results thus clearly demonstrated that all three antioxidants are carcinogenic in rodent stomach epithelia.
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