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Background/Aims: There are few available data regarding the association between the single nucleotidepolymorphisms (SNPs) of the gene encoding interleukin 28B (IL28B) and a sustained virologic response (SVR) topeginterferon (PEG-IFN) plus ribavirin (RBV) therapy in Korean chronic hepatitis C patients. Methods: This was a retrospective cohort study of 156 patients with chronic hepatitis C virus (HCV) infection whoreceived combination treatment of PEG-IFN plus RBV. Blood samples from these patients were analyzed to identifythe IL28B SNPs at rs12979860, rs12980275, rs8099917, and rs8103142. Association analyses were performed to evaluatethe relationships between each IL28B SNP and SVRs. Results: Seventy six patients with HCV genotype 1 and 80 with genotype non-1 were enrolled. The frequencies ofrs12979860 CC and CT genotypes were 90.4% and 9.6%, respectively; those of rs12980275 AA and AG genotypes were87.2% and 12.8%, respectively; those of rs8099917 TT and TG genotypes were 92.3% and 7.7%, respectively; and thoseof rs8103142 TT and CT genotypes were 90.4% and 9.6%, respectively. Among the patients with HCV genotype 1, theSVR rates were 69.7% and 80.0% for rs12979860 CC and CT, respectively (P=0.71). Among the HCV genotype non-1patients, SVR rates were 88.0% and 100% for rs12979860 CC and CT (P=1.00), respectively. Conclusions: Genotypes of the IL28B SNP that are known to be favorable were present in most of the Korean patientswith chronic hepatitis C in this study. Moreover, the IL28B SNP did not influence the SVR rate in either the HCVgenotype 1 or non-1 patients. Therefore, IL28B SNP analysis might be not useful for the initial assessment, predictionof treatment outcomes, or treatment decision-making of Korean chronic hepatitis C patients.

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