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Perfluorooctanoic acid (PFOA) is a peroxisome proliferator. The aim of this study was to test for its ability to act as a positive modulator of hepatocarcinogenesis, in the so-called biphasic (initiation by diethylnitrosamine 200 mg/kg ip followed by treatment with the suspected modulators) and triphasic (initiation by the same dose of diethylnitrosamine followed by a selection procedure for 2 weeks consisting of giving 2-acetylaminofluorene and in the middle of this treatment a single dose of CCl4 followed by treatment with the suspected modulators) protocols of liver carcinogenesis. In both protocols treatment with PFOA increased the incidence of malignant hepatocellular carcinoma (HCC). As compared to phenobarbital, the modulating effect of PFOA is more pronounced in a biphasic than in the triphasic protocol. In parallel with positive modulation of HCC, PFOA also selectively induced the peroxisomal acyl-CoA oxidase activity and, to a lesser extent, catalase activity.
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