Subjects who participated in a clinical trial in which Peginterferon Lambda-1a (BMS-914143) was administered for the treatment of chronic hepatitis C

Observational study - No Intervention [subjects were previously treated with Peginterferon Lambda-1a (BMS-914143)]

Durability of virologic response as assessed by the time to loss of virologic response in subjects treated in a previous study with BMS-914143 who have HCV RNA less than the limit of quantitation of the assay (< LOQ) at the completion of the required post-treatment follow-up in the previous study. Loss of virologic response assessed using HCV RNA at 24-week intervals

Long-term progression of liver disease as measured by laboratory indicators of hepatic status and function, all-cause mortality and liver related mortality in subjects previously treated with BMS-914143 who have HCV RNA < LOQ at the completion of the required post-treatment follow-up in the parent study