Long-term clinical and virological outcomes of chronic hepatitis C after successful interferon therapy

Journal of Medical Virology
Natsuko TsudaMichio Kato

Abstract

Clinical relevance of occult hepatitis C virus (HCV) and/or hepatitis B virus (HBV) infection(s) remains uncertain years after interferon (IFN) therapy for chronic hepatitis C. By 1993, 38 sustained virological responders (SVRs) showing HCV RNA clearance at 6 months post-treatment and 37 biochemical responders (BRs) with end-of-treatment alanine aminotransferase (ALT) normalization and subsequent 6-month stabilization within 2 x the upper limit of normal (ULN) were enrolled. They were monitored for 4.4-12 years (median 6.8), then 15 SVRs and 15 BRs underwent paired liver biopsies. Biopsy samples were tested for positive and negative HCV RNA strands, and HBV DNA surface and X sequences. All SVRs showed sustained serum HCV RNA clearance during follow-up, but hepatocellular carcinoma (HCC) developed in 4 (11%) SVRs. On paired liver biopsies, histological improvement was significant, but mild inflammation persisted in 87% of SVRs. Nonetheless, no HCV RNA sequence was amplified from liver tissues, and HBV DNA sequences were found in only one SVR. As for BRs, biochemical flare-up of >2 x ULN occurred at a 5-year risk of 41% (95% CI 24.7-56.4). The event was unpredictable but controllable by retreatment in 70%. Liver tissues after fol...Continue Reading

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