• Sustained virologic response (SVR) [ Time Frame: Week 72 ] [ Designated as safety issue: No ]
  

• Rapid virologic response [ Time Frame: Week 4 ] [ Designated as safety issue: No ]
  
• Early virologic response [ Time Frame: Week 12 ] [ Designated as safety issue: No ]
  
• Undetectable HCV RNA [ Time Frame: Week 24 and Week 48 ] [ Designated as safety issue: No ]
  
• Normalization of ALT (a liver enzyme) [ Time Frame: Week 48 ] [ Designated as safety issue: Yes ]
  
• Quality of life evaluation [ Time Frame: throughout the entire study ] [ Designated as safety issue: No ]
  
• Safety assessments (physical exams, AE reporting, lab testing/analysis, HADS and Immunogenicity testing) [ Time Frame: Throughout the entire study ] [ Designated as safety issue: Yes ]
  

Key Inclusion Criteria:

• Diagnosis of chronic hepatitis C.
• Liver biopsy performed within 2 years of Day 0 or during screening.
• Infected with hepatitis C virus genotype 1.
• Interferon alfa treatment naïve (ie, have never been treated with an interferon product).
• Subjects are eligible to enter the study if they (or their partners) are not pregnant or nursing, are sterile, or of non childbearing potential, or are willing to practice abstinence or use appropriate birth control methods during the study and for 7 months after the last dose of ribavirin.
• Have compensated liver disease.

Key Exclusion Criteria:

• Decompensated liver disease including those subjects with a past history or presence of ascites, bleeding varices or hepatic encephalopathy.
• History of moderate, severe or uncontrolled psychiatric disease, especially depression, including a history of hospitalization or prior suicidal attempt.
• Positive for human immunodeficiency virus (HIV-1) or hepatitis B surface antigen (HBsAG).
• Clinical diagnosis of other causes of chronic liver disease including but not limited to hepatitis B, autoimmune hepatitis, primary biliary cirrhosis, alcoholic liver disease, hemochromatosis, Wilson's Disease, or alpha 1-antitrypsin deficiency.
• A history of immunologically mediated disease (eg, rheumatoid arthritis, inflammatory bowel disease, moderate/severe psoriasis, sarcoidosis, systemic lupus erythematosus).
• Active seizure disorder within the last 2 years.
• Organ transplant other than cornea and hair transplant.
• Clinically significant hemoglobinopathy (eg, thalassemia, sickle cell anemia).
• Cancer within the last 5 years(with the exception of adequately treated basal cell carcinoma of the skin or in situ carcinoma of the uterine cervix).
• Drug or alcohol addiction within the last 6 months. Subjects in a supervised methadone treatment program may be enrolled in the study.
• Received any experimental agent within 28 days prior to Day 0.