This is a single-arm, open-label, multicenter study of treatment-experienced participants with Genotype 1 CHC, who self-identified as Black/African American (Group A) or who did not self-identify as Black/African American (Group B). Participants did not achieve a sustained virologic response 24 weeks after at least 1 prior course of Peg-IFN-alfa-2a/RBV therapy of standard duration, and have 1 of the following viral responses:
* Prior relapse: Participant had a documented undetectable hepatitis C virus ribonucleic acid (HCV RNA) level at the planned end of treatment of at least 42 weeks duration (HCV RNA evaluated anytime between 3 weeks before and 6 weeks after the last dose of Peg IFN-alfa-2a or RBV).
* Prior null response: Participant had a \<2-log10 decrease in HCV RNA at 12 weeks, during prior Peg IFN-alfa-2a/RBV treatment, but never achieved undetectable HCV RNA while on treatment.
* Prior partial response: Participant had a \>=2-log10 decrease in HCV RNA at 12 weeks, during prior Peg IFN-alfa-2a/RBV treatment, but never achieved undetectable HCV RNA while on treatment.
