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A Protocol for Analyzing Hepatitis C Virus Replication
Published on: June 26, 2014
Natural history of hepatitis C virus infection
1Bombay Hospital, Medical Research Centre and Institute of Post Graduate Sciences, Mumbai, India. deepakn@bom3.vsnl.net.in
Insights
Hepatitis C virus (HCV) infection often leads to chronic liver disease. This study found immunosuppression and acquiring infection after age 35 accelerate cirrhosis development in HCV patients.
Area of Science:
- Hepatology
- Virology
- Immunology
Background:
- Hepatitis C virus (HCV) infection causes significant morbidity and mortality globally.
- While spontaneous clearance occurs in 10-20% of cases, over 80% develop chronic infection.
- Chronic HCV infection can progress to liver fibrosis, cirrhosis, and hepatocellular carcinoma over decades.
Purpose of the Study:
- To investigate factors influencing the progression of liver disease in patients with chronic Hepatitis C virus infection.
- To determine the time course of cirrhosis development in a cohort of chronic HCV patients.
- To identify specific risk factors associated with accelerated fibrosis and cirrhosis progression.
Main Methods:
- Retrospective analysis of 141 patients with chronic HCV infection and established chronic liver disease.
- Assessment of time to cirrhosis development.
- Evaluation of factors including age at infection, immunosuppression, diabetes, sex, and HBV co-infection.
Main Results:
- The median time to develop cirrhosis in the study cohort was 20 years.
- Patients acquiring HCV infection after age 35 progressed to cirrhosis faster (16 years) compared to the median (20 years).
- Immunosuppressed patients showed significantly faster progression to cirrhosis (8 years) than non-immunosuppressed patients (21 years).
Conclusions:
- Age at infection (after 35 years) and immunosuppression are key factors accelerating cirrhosis in chronic Hepatitis C.
- Diabetes, sex, and HBV co-infection were not associated with faster progression to cirrhosis in this cohort.
- Understanding these progression factors is crucial for managing chronic Hepatitis C and preventing advanced liver disease.
Abstract:
Hepatitis C is a heterogeneous disease whose natural history is controversial and perplexing. However, it can be a pernicious disease and is responsible for considerable mortality and morbidity. More than 80% individuals infected with the hepatitis C virus (HCV) develop chronic infection; the remaining 10-20% develop spontaneous clearance with natural immunity. The majority of patients who develop chronic HCV infection are asymptomatic; but 60-80% develop chronic hepatitis as indicated by elevated ALT; around 30% maintain normal ALT. One-third of chronically infected patients develop progressive liver injury, fibrosis and cirrhosis over a period of 20-30 years, and 15% develop hepatocellular carcinoma. Acquiring infection after the age of 40 years, male sex, excessive alcohol-consumption, HBV or HIV co-infection and the immunosuppressive state have been identified as factors associated with progression of fibrosis and development of cirrhosis. The relationship between virus load, HCV genotype I and quasispecies variability and progression of live disease is controversial. In the present study on 141 patients with chronic HCV infection and established chronic liver disease, the median time to develop cirrhosis was 20 years. Progression to cirrhosis was faster (16 vs 20 years) in those who acquired infection after the age of 35 years, and in immunosuppressed patients (8 vs 21 years), whereas diabetes, sex and HBV co-infection were not associated with faster progression.
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