Impact of IL28B polymorphisms on response to peginterferon and ribavirin in HIV–hepatitis C virus-coinfected patients with prior nonresponse or relapse

Abstract

IL28B polymorphisms predict treatment response in chronic hepatitis C. However, no information exists in prior treatment failures. A total of 62 HIV/hepatitis C virus (HCV) patients who completed retreatment with peginterferon-α/ribavirin were examined, of whom 25 (40%) had been cured. Predictors of response [odds ratio, OR (95% confidence interval, CI)] were HCV genotypes 2/3 [16.1 (2.7-90.9)], prior relapse [9.6 (1.5-62.4)] and ribavirin plasma trough concentrations at week 4 [4.9 (1.3-18.4)]. IL28B-CC only predicted response in prior nonresponders carrying HCV genotypes 1/4 [25.1 (1.9-337)].