Inhibition of N-2-fluorenylacetamide-induced mammary tumorigenesis in rats by dietary polybrominated biphenyls

E. L. Schwartz, W. M. Kluwe, S. D. Sleight, J. B. Hook, J. I. Goodman

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Female SD rats were maintained for approximately 1 year on diets containing 300 ppm N-2-fluorenylacetamide (2-FAA), 50 ppm polybrominated biphenyls (PBB), or a combination of these chemicals (PBB+2-FAA). Ingestion of 2-FAA significantly reduced the average survival time of the rats; this effect was virtually blocked by the simultaneous ingestion of PBB. Simultaneous ingestion of PBB also significantly reduced the overall incidence of 2-FAA-induced tumors during the examination period. The lower incidence of tumorigenesis was accompanied by an increase in the latency time for tumor induction; tumors were found in 100% of the animals given 2-FAA after 29 weeks of carcinogen ingestion, whereas only 50% of the PBB+2-FAA-fed animals had tumors at the end of the experiment (53 wk of carcinogen ingestion). PBB significantly reduced the incidence of 2-FAA-induced tumors at nonhepatic locations (mammary gland and ear duct) but did not affect the incidence of hepatic tumors to a statistically significant extent. PBB ingestion did not significantly increase the incidence of tumors when compared with controls; 1 tumor was found in 1 of 12 rats fed 50 ppm PBB for 57 weeks, and no tumors were detected in 8 controls.

Original languageEnglish (US)
Pages (from-to)63-67
Number of pages5
JournalJournal of the National Cancer Institute
Issue number1
StatePublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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