A Study of Ritonavir-Boosted Danoprevir (RO5190591) in Combination With Pegasys and Ribavirin in Patients With Chronic Hepatitis C Genotype 1

A Multiple-Dose Study To Evaluate Safety, Tolerability, Pharmacokinetics and Antiviral Activity of Ritonavir-Boosted RO5190591 in Combination With Peginterferon Alfa-2a Plus Ribavirin in Patients With Chronic Hepatitis C Genotype 1

This study will evaluate the efficacy, safety and tolerability of danoprevir (RO5190591) plus ritonavir as compared to danoprevir alone or placebo plus ritonavir in patients with chronic hepatitis C genotype 1 receiving Pegasys (peginterferon alfa-2a) and ribavirin. Patients in cohorts will be randomized to receive either oral doses of danoprevir, or danoprevir plus ritonavir, or placebo plus ritonavir. All patients will receive Pegasys (180mcg sc once weekly) plus ribavirin (1000-1200mg/day po), with the option to continue this treatment after completion of study drug treatment. Anticipated time on study treatment is up to 12 weeks.

Inclusion Criteria:

• Adults, 18-65 years of age
• Chronic hepatitis C genotype 1
• HCV treatment naïve, or without sustained virologic response on prior PEG-INF/RBV treatment
• Body mass index (BMI) 18 - 35 kg/m2, inclusive; minimum weight 45 kg

Exclusion Criteria:

• Liver cirrhosis
• Decompensated liver disease or impaired liver function
• Medical condition associated with chronic liver disease other than chronic hepatitis C
• Positive for hepatitis B or HIV infection at screening
• History of alcohol consumption exceeding 2 standard drinks per day when averaged over the course of a given week