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Hepatocellular Carcinoma, Alcohol, and Cirrhosis: Facts and Hypotheses

Overview
Journal Dig Dis Sci
Specialty Gastroenterology
Date 1991 Aug 1
PMID 1650691
Citations 4
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Abstract

Despite the epidemiological evidence of a correlation between ethanol abuse and hepatocellular carcinoma, some of the results of experimental and clinical studies remain controversial. Apart from inducing cirrhosis, which may be viewed as a precancerous liver lesion, ethanol may act as a cocarcinogen. Most investigations on this topic have focused on two aspects: ethanol's capacity to induce the cytochrome P-450-dependent microsomal biotransformation system and its interference with at least one DNA repair mechanism. Ethanol exposure enhances the capacity of mixed function oxidases to activate many chemical carcinogens, such as dimethylnitrosamine (DMN). On the other hand, ethanol exposure fails to influence DMN-induced liver carcinogenesis. The capacity of alcohol to inhibit DMN-demethylase activity has not been clearly demonstrated in experiments carried out with human tissue. In conclusion, both the effects of ethanol and their underlying mechanisms as regards liver carcinogenesis are open to debate. The link between ethanol abuse and hepatocellular carcinoma appears to be mediated mainly by its capacity to induce cirrhosis.

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