Each investigator participating in this registry will employ his or her discretion and standard clinical practice to determine when to see the patient in the clinic, how to manage the patient's drug regimen, and how best to monitor the patient's response and tolerance to therapy.The decision to enroll a patient and start therapy with Infergen and other prescribed therapies may be guided by historic biopsy results, or the patient can undergo liver biopsy at the investigator's discretion. Biopsy is not a prerequisite, however, if the investigator believes it to be unnecessary. When a patient's treatment is expected to require significant dose modification and/or more intensive monitoring because of comorbid conditions, enrolling the patient in the registry is at the investigator's discretion. For purposes of the registry, data will be collected at baseline; at Weeks 4, 12, 24, and 48 from the start of therapy; and at follow-up visits 4 and 24 weeks after treatment ends.