- HCV treatment-naive (HCV genotype 1, 2, 3 or 6), defined as no prior exposure to any interferon (IFN), RBV, or other approved or experimental HCV-specific direct-acting antiviral agent, or HCV treatment-experienced (HCV genotype 1, 2, 3, or 6 only) with medical records that include sufficient detail of prior treatment with IFN to allow for categorization of prior response as either IFN Intolerant, non-responder, or experiences viral breakthrough or relapse