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Background/Aims: The re is some controversy regarding whether or not hepatitis C virus (HCV) subtype 1b is more infl uential than non-1b subtypes on the progression of chronic hepatitis (CH) C to liver cirrhosis (LC) and hepatocellular carcinoma (HCC). Methods: We retrospectively analyzed 823 patients with chronic HCV infection, including 443 CH patients, 264 LC patients, and 116 HCC patients, who were HCV RNA positive and HBsAg negative. These patients had not received any prior treatment with either interferon alone or a combination of interferon and ribavirin. Results: HCV subtypes 1b (51.6%) and 2a/2c (39.5%) were the two most common genotypes. The proportions of genotypes 2 (2a/2c, 2b, and 2) and 3 were 45.8% and 1.1%, respectively. One case of genotype 4 was found. HCV subtype 1b (47.3%) was less common than the non-1b subtypes (52.7%) in non-LC patients, but its proportion (56.9%) was higher than that of non-1b subtypes (43.1%) in LC patients (P=0.006). The proportions of patients with HCV subtype 1b did not diff er signifi cantly between the LC (55.3%) and HCC (60.3%) groups. Older age, male gender, and the relative progression of liver damage (non-LC vs. compensated LC vs. decompensated LC) were significant risk factors for HCC, with odds ratios of 1.081 (95% confi dence interval [CI], 1.056-1.106), 5.749 (95% CI, 3.329-9.930), and 2.895 (95% CI, 2.183-3.840),respectively. HCV subtype 1b was not a signifi cant risk factor for HCC (odds ratio, 1.423; 95% CI, 0.895-2.262). Conclusions: HCV subtypes 1b and 2a/2c were the two most common HCV genotypes. HCV subtype 1b seemed to be more infl uential than non-1b subtypes on the progression of CH to LC, but not on the development of HCC from LC. (Clin Mol Hepatol 2012;18:219-224)

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