title: Acceleration of hepatocarcinogenesis of 2,7-bis(acetamido)fluorene by carbon tetrachloride and time relation of treatment.
abstract: The role of period between administration of CCl4 and feeding of 2,7-bis-(acetamido)fluorene in the hepatocarcinogenesis of mice was analyzed by using 14 groups of different feeding schedules. Simultaneous treatment with CCl4 and either continuous or intermittent feeding of 2,7-bis(acetamido)fluorene increased the average number of hepatic nodules and the incidence of hepatomas, while separation of 8-week feeding of 2,7-bis(acetamido)fluorene from 8 week treatment with CCl4 did not accelerate the hepatocarcinogenesis. Alternate treatment with CCl4 and 2,7-bis(acetamido)fluorene increased the average number of hepatic nodules but failed to induce hepatomas. Allyl alcohol, which is a hepatotoxic substance as is CCl4, also failed to accelerate hepatocarcinogenesis of 2,7-bis(acetamido)fluorene. Concerning the feeding schedule of 2,7-bis(acetamido)fluorene alone, the intermittent one-week feeding of the carcinogen with 3-week intervals decreased the average number of hepatic nodules as compared with the continuous feeding of the carcinogen.
mesh_terms: D015073:2-Acetylaminofluorene / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000633:toxicity*; D000818:Animals; D002251:Carbon Tetrachloride / Q000008:administration & dosage / Q000494:pharmacology*; D006528:Carcinoma, Hepatocellular / Q000139:chemically induced*; D005260:Female; D005449:Fluorenes / Q000633:toxicity*; D006965:Hyperplasia / Q000139:chemically induced; D008113:Liver Neoplasms / Q000139:chemically induced*; D008297:Male; D051379:Mice; D009374:Neoplasms, Experimental / Q000139:chemically induced; D012737:Sex Factors; D013997:Time Factors
chemical_list: D005449:Fluorenes; D015073:2-Acetylaminofluorene; D002251:Carbon Tetrachloride