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Recovery, persistence, and sequelae in hepatitis C virus infection: a perspective on long-term outcome
1Department of Transfusion Medicine, Warren Grant Magnuson Clinical Center, Bethesda, Maryland, USA.
Insights
Hepatitis C (HCV) affects millions globally, often progressing silently to severe liver disease. However, most HCV carriers may experience non-progressive disease or spontaneous recovery, offering hope for infected individuals.
Area of Science:
- Hepatology and Viral Gastroenterology
- Infectious Diseases and Epidemiology
Background:
- Hepatitis C virus (HCV) is a leading cause of chronic liver disease and liver transplantation in the US.
- The disease is characterized by silent onset, high viral persistence, and potential progression to cirrhosis and hepatocellular carcinoma.
- Accurate assessment of HCV natural history is challenging due to silent progression and potential biases in study methodologies.
Purpose of the Study:
- To review the natural history of Hepatitis C virus infection.
- To analyze outcomes from retrospective, prospective, and cohort studies in adults and children.
- To examine factors influencing disease progression, including fibrosis, hepatocellular carcinoma, and cofactors.
Main Methods:
- Review of retrospective, prospective, and cohort studies on Hepatitis C virus outcomes.
- Analysis of data on fibrosis progression and hepatocellular carcinoma development.
- Consideration of cofactors and spontaneous viral clearance rates.
Main Results:
- Retrospective studies at referral centers show high progression rates, likely due to referral bias.
- Prospective and cohort studies indicate lower progression rates, with higher rates of recovery or minimal liver disease.
- Emerging data suggest spontaneous viral clearance may be higher than previously believed.
Conclusions:
- Severe, progressive liver disease affects a minority (around 30%) of chronically infected individuals.
- Fibrosis progression is not always linear or inevitable; many HCV carriers may have stable or indolent disease.
- While a significant burden exists, many HCV-infected individuals may experience non-progressive disease or benefit from therapy, offering hope.
Abstract:
Hepatitis C has emerged in recent years as the most common basis for liver disease in the United States, having infected an estimated 3.9 million people in this country and an estimated 170 million worldwide. Currently, it is the predominant reason for undergoing liver transplantation. The disease it causes is characterized by silent onset in most infected individuals, a high rate of viral persistence, and the potential for development of ever-worsening chronic liver disease, ranging from chronic hepatitis to cirrhosis and occasionally to hepatocellular carcinoma. Such progression, when it occurs, is also most commonly a silent process that may take 20-40, and occasionally even more, years to reach its end point. Because of these characteristics, it has been exceedingly difficult to accurately assess the natural history. Efforts to accomplish this have consisted of retrospective, prospective, and cohort studies. The most concerning data have derived from the retrospective study approach, generally performed at tertiary referral centers. Because these centers commonly attract persons with existing chronic liver disease, they have tended to describe a high rate of progression to cirrhosis and cancer. This "referral bias" is avoided in the prospective and cohort study approach, and data derived from these studies indicate a lower rate of progression and a correspondingly higher rate of either recovery or minimal liver disease. In this review, we briefly describe potential mechanisms of viral persistence; present detailed information on outcomes that have derived from retrospective, prospective, and cohort studies, involving both adults and children; examine the data regarding progression of fibrosis and of progression to hepatocellular carcinoma; consider cofactors that might enhance liver disease progression; and report the emerging data that suggest that spontaneous viral clearance may be higher than is currently believed. We conclude with the view that severe, life-threatening, progressive liver disease clearly occurs in a sizable minority (perhaps 30%) of chronically infected persons but speculate that fibrosis progression is neither linear or inevitable and hence that most hepatitis C virus carriers will have either a stable nonprogressive course or such indolent progression that they will die from an unrelated disease before the severe sequelae of hepatitis C become manifest or will have a sustained "curative" response to therapy. Although this view provides reasonable hope to the hepatitis C virus-infected individual, it does not deny the enormous burden this infection presents as the result of its high prevalence and global distribution. The sheer magnitude of the infected population will result in a large number with severe life-threatening liver disease even if the proportion of infected individuals that develop progressive disease is relatively small.