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Natural history of hepatitis C virus infection
1Department of Hepatology, Hôpital Beaujon, Clichy, France.
Insights
Hepatitis C virus (HCV) infection often becomes chronic, with diagnosis relying on liver biopsy. Chronic hepatitis C carries risks of cirrhosis and liver cancer, necessitating surveillance and avoiding alcohol.
Area of Science:
- Hepatology
- Virology
- Immunology
Background:
- The natural history of Hepatitis C virus (HCV) infection remains incompletely understood.
- HCV infection frequently progresses to chronic forms (70-80%) with a long latency period.
- Diagnosis of chronic HCV infection typically requires liver biopsy for staging disease severity.
Purpose of the Study:
- To elucidate the natural history and clinical characteristics of Hepatitis C virus infection.
- To highlight diagnostic challenges and prognostic risks associated with chronic HCV.
- To outline associated immune disorders and recommend management strategies.
Main Methods:
- Analysis of clinical data and liver biopsy results from HCV-infected patients.
- Hepatitis C virus RNA screening using Polymerase Chain Reaction (PCR).
- Assessment of histological scores for disease severity and progression.
Main Results:
- Chronic hepatitis C has a 20% risk of developing cirrhosis within 10 years.
- Cirrhotic patients face an approximate 3% annual risk of liver cell carcinoma.
- HCV infection is associated with various immune disorders, including cryoglobulinemia and autoimmune diseases.
Conclusions:
- Systematic surveillance is justified for cirrhotic patients due to cancer risk.
- Alcohol consumption exacerbates the severity of chronic HCV disease.
- HCV carriers should be strongly advised against alcohol intake to mitigate disease progression.
Abstract:
The natural history of hepatitis C virus infection is still unclear. This disease has a long clinical latency period and very frequently develops into chronic forms (in 70-80% of cases). Diagnosis of chronic HCV infection can only be based on liver biopsy. Histological scores permit rating disease severity and to compare successive biopsy specimens. Certain clinical peculiarities deserve to be underlined, such as the frequent asymptomatic forms with normal serum transaminase. Histologically, the liver can be either normal or the focus of chronic hepatitis. HCV RNA screening by PCR may or may not detect virus C replication. Histologically documented chronic hepatitis carry a 20% risk of developing into cirrhosis in 10 years. The risk of liver cell carcinoma is around 3% per year in cirrhotic patients. That risk justifies systematic surveillance, as is currently applied to cirrhotic patients in France. Immune disorders are frequent during HCV infection: presence of anti-tissue antibodies and especially anti-LKM1 antibody, cryoglobulinaemia, glomerulopathy, thyroid disease, Sjögren's disease, late skin porphyria, lichen planus, haemolytic anaemia, idiopathic thrombocytopenic purpura. The severity of chronic diseases induced by HCV is certainly increased by alcohol intake and all chronic HCV carriers should be advised not to drink any alcohol.