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This study concerns the modifying effect of carbon tetrachloride (CCl4) on methylazoxymethanol acetate (MAM)-induced intestinal carcinogenesis in ACI rats of both sexes. Forty five animals were given CCl4 (0.5 ml/kg body weight) through a stomach tube, followed by an i.p. injection with MAM (25 mg/kg body weight) 24 hours after CCl4 treatment. The paired administrations were done once a week for 4 weeks and animals were observed until sacrifice 30 weeks later. Pretreatment with CCl4 caused not only early death from chemical toxicity of MAM but also an increase in small-bowel tumors.

Enhancing effect of preadministration of carbon tetrachloride on methylazoxymethanol acetate-induced intestinal carcinogenesis.