Safety and Efficacy Study of Interferon Gamma-1b in Hepatitis C Patients With Liver Fibrosis or Cirrhosis

Men or women 18 to 75 years Chronic hepatitis C infection based on a history of positive anti-HCV antibody and/or HCV RNA History of prior treatment with interferon-a-based therapies or an assessment by the investigator that the patient would not benefit from interferon-a-based therapy or that treatment with interferon-a is contraindicated Stage 4, 5 or 6 liver fibrosis according to the Ishak scoring system. Cannot have presence of clinically evident ascites requiring active diuretic therapy, history of or therapy for hepatic encephalopathy, or history of GI variceal bleeding within the last 2 years (diuretic therapy of stable mild-to-moderate peripheral edema is permitted) Must meet minimum blood chemistry requirements Cannot have unstable or uncontrolled thyroid disease Cannot have a variety of other diseases (listed in protocol Other conditions for enrollment exist which would be discussed with a Clinician upon screening for the study.