title: Chronic study on BHT in rats.
abstract: Groups of 40, 29, 39 and 44 F0 rats of each sex were fed a semi-synthetic diet containing butylated hydroxytoluene (BHT) in concentrations to provide intakes of 0, 25, 100 or 500 mg/kg body weight/day, respectively. The F0 rats were mated, and groups of 100, 80, 80 and 100 F1 rats of each sex were formed. After weaning, the highest dose of BHT was lowered to 250 mg/kg/day for the F1 rats. At weaning the BHT-treated F1 rats, especially the males, had lower body weights than the controls and the effect was dose related. The survival of the BHT-treated rats of both sexes was higher than that of the controls. Dose-related increases in the numbers of hepatocellular adenomas and carcinomas were statistically significant in male F1 rats when all groups together were tested for heterogeneity or analysis for trend. The increases in hepatocellular adenomas and carcinomas in treated female F1 rats were only statistically significant for adenomas in the analysis for trend. All hepatocellular tumours were detected when the F1 rats were more than 2 years old.
mesh_terms: D000236:Adenoma / Q000139:chemically induced*; D000284:Administration, Oral; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D002084:Butylated Hydroxytoluene / Q000633:toxicity*; D002273:Carcinogens; D005260:Female; D008113:Liver Neoplasms / Q000139:chemically induced*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D002273:Carcinogens; D002084:Butylated Hydroxytoluene