IL28B polymorphisms predict reduction of HCV RNA from the first day of therapy in chronic hepatitis C

J Hepatol. 2011 Feb 24. [Epub ahead of print]

Bochud PY, Bibert S, Negro F, Haagmans B, Soulier A, Ferrari C, Missale G, Zeuzem S, Pawlotsky JM, Schalm S, Hellstrand K, Neumann AU, Lagging M; the DITTO-HCV study group.

Service of Infectious Diseases, Department of Medicine, University Hospital and University of Lausanne, Switzerland.

Abstract

BACKGROUND: Single nucleotide polymorphisms (SNPs) associated with IL28B influence the outcome of peginterferon-α/ribavirin therapy of chronic hepatitis C virus (HCV) infection. We analyzed the kinetics of HCV RNA during therapy as a function of IL28B SNPs.

METHODS: IL28B SNPs rs8099917, rs12979860, and rs12980275 were genotyped in 242 HCV treatment-naïve Caucasian patients (67% genotype 1, 28% genotype 2 or 3) receiving peginterferon-α2a (180 μg weekly) and ribavirin (1000-1200 mg daily) with serial HCV-RNA quantifications. Associations between IL28B polymorphisms and early viral kinetics were assessed, accounting for relevant covariates.

RESULTS: In the multivariate analyses for genotype 1 patients, the T allele of rs12979860 (T(rs12979860)) was an independent risk factor for a less pronounced first phase HCV RNA decline (log(10) 0.89 IU/ml among T carriers vs. 2.06 among others, adjusted P<0.001) and lower rapid (15% vs. 38%, adjusted P=0.007) and sustained viral response rates (48% versus 66%, adjusted P<0.001). In univariate analyses, T(rs12979860) was also associated with a reduced second phase decline (P=0.002), but this association was no longer significant after adjustment for the first phase decline (adjusted P=0.8). In genotype 2/3 patients, T(rs12979860) was associated with a reduced first phase decline (adjusted P=0.04), but not with second phase decline.

CONCLUSION: Polymorphisms in IL28B are strongly associated with the first phase viral decline during peginterferon-α/ribavirin therapy of chronic HCV infection, irrespective of HCV genotype.

Copyright © 2011. Published by Elsevier B.V.

PMID: 21354446 [PubMed - as supplied by publisher]

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