The spectrum of extrahepatic manifestations in hepatitis C virus infection

Area of Science:

• Hepatology
• Immunology
• Virology

Background:

• Hepatitis C virus (HCV) infection extends beyond the liver, affecting non-hepatic tissues.
• Numerous extrahepatic manifestations (EHMs) are associated with HCV, ranging from well-established to probable links.

Purpose of the Study:

• To review well-established and newly recognized extrahepatic manifestations of HCV infection.
• To discuss pathogenetic mechanisms and therapeutic challenges in HCV-associated EHMs.
• To evaluate interferon-alpha and corticosteroid therapy efficacy and side effects.

Main Methods:

• Literature review focusing on established and emerging HCV-associated extrahepatic disorders.
• Analysis of pathogenetic mechanisms and autoimmune features.
• Review of therapeutic data for interferon-alpha and corticosteroids.

Main Results:

• Well-established EHMs include mixed cryoglobulinemia, thyroid abnormalities, and lichen planus.
• Newly recognized associations involve diabetes mellitus, thrombocytopenia, and antiphospholipid syndrome.
• Pathogenesis of EHMs and autoimmune features remains unclear, complicating treatment decisions.

Conclusions:

• HCV infection has diverse extrahepatic effects, necessitating a broader clinical perspective.
• Understanding pathogenesis is crucial for managing HCV-associated conditions.
• Therapeutic guidelines for interferon-alpha and corticosteroids are provided, considering efficacy and side effects.