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Impact of alcohol on the histological and clinical progression of hepatitis C infection.

In patients infected with the hepatitis C virus (HCV), 20% to 30% will progress to cirrhosis in over two to three decades. Viral and host factors that are important in the clinical and histologic progression of HCV infection are not entirely certain. It has been suggested that liver disease is worse in alcoholics infected with HCV. In the present retrospective study, we examined the effect of moderate alcohol intake on the histologic and clinical progression of HCV infection and assessed whether other variables such as gender, length of exposure, mode of exposure, HCV RNA levels, and ferritin levels also independently impacted disease progression. Liver biopsies were analyzed for the degree of fibrosis, presence of cirrhosis, and histologic activity by using the Histologic Activity Index of Knodell. Patients were divided into two groups based on whether their alcohol intake was significant or not significant. Significant alcohol intake was defined as > 40 g alcohol/day in women and > 60 g of alcohol/day in men for > 5 years. Groups were further divided based on the decades of exposure to HCV. There was no difference in the age or length of exposure to HCV in the alcohol and the alcohol-free group. HCV RNA serum levels, ferritin levels, and viral genotypes were similar in both groups. There was a two- to threefold greater risk of liver cirrhosis and decompensated liver disease in the alcohol group. Also, the rate to which subjects developed cirrhosis was faster in the alcohol group with 58% being cirrhotic by the second decade as opposed to 10% being cirrhotic in the nonalcohol group by the second decade. The histologic and clinical acceleration of liver disease was independent of the mode of exposure or sex. In summary, alcohol intake is an independent risk factor in the clinical and histologic progression of HCV infection.

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