title: A sustained virologic response is durable in patients with chronic hepatitis C treated with peginterferon alfa-2a and ribavirin.
abstract: OBJECTIVE
  A sustained virologic response (SVR) to therapy for hepatitis C virus (HCV) infection is defined as the inability to detect HCV RNA 24 weeks after completion of treatment. Although small studies have reported that the SVR is durable and lasts for long periods, it has not been conclusively shown.
  
  
  METHODS
  The durability of treatment responses was examined in patients originally enrolled in one of 9 randomized multicenter trials (n = 1343). The study included patients who received pegylated interferon (peginterferon) alfa-2a alone (n = 166) or in combination with ribavirin (n = 1077, including 79 patients with normal alanine aminotransferase levels and 100 patients who were coinfected with human immunodeficiency virus and HCV) and whose serum samples were negative for HCV RNA (<50 IU/mL) at their final assessment. Patients were assessed annually, from the date of last treatment, for a mean of 3.9 years (range, 0.8-7.1 years).
  
  
  RESULTS
  Most patients (99.1%) who achieved an SVR had undetectable levels of HCV RNA in serum samples throughout the follow-up period. Serum samples from 0.9% of the patients contained HCV RNA a mean of 1.8 years (range, 1.1-2.9 years) after treatment ended. It is not clear if these patients were reinfected or experienced a relapse.
  
  
  CONCLUSIONS
  In a large cohort of patients monitored for the durability of an SVR, the SVR was maintained for almost 4 years after treatment with peginterferon alfa-2a alone or in combination with ribavirin. In patients with chronic hepatitis C infection, the SVR is durable and these patients should be considered as cured.
authors.affiliation: Health Research Innovation Center, University of Calgary, Calgary, Alberta, Canada. swain@ucalgary.ca
authors.forename: Mark G
authors.initials: MG
authors.lastname: Swain
authors.forename: Ming-Yang
authors.initials: MY
authors.lastname: Lai
authors.forename: Mitchell L
authors.initials: ML
authors.lastname: Shiffman
authors.forename: W Graham E
authors.initials: WG
authors.lastname: Cooksley
authors.forename: Stefan
authors.initials: S
authors.lastname: Zeuzem
authors.forename: Douglas T
authors.initials: DT
authors.lastname: Dieterich
authors.forename: Armand
authors.initials: A
authors.lastname: Abergel
authors.forename: Mário G
authors.initials: MG
authors.lastname: Pessôa
authors.forename: Amy
authors.initials: A
authors.lastname: Lin
authors.forename: Andreas
authors.initials: A
authors.lastname: Tietz
authors.forename: Edward V
authors.initials: EV
authors.lastname: Connell
authors.forename: Moisés
authors.initials: M
authors.lastname: Diago
mesh_terms: D000998:Antiviral Agents / Q000008:administration & dosage / Q000627:therapeutic use; D004305:Dose-Response Relationship, Drug; D004337:Drug Carriers; D004359:Drug Therapy, Combination; D005500:Follow-Up Studies; D016174:Hepacivirus / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification*; D019698:Hepatitis C, Chronic / Q000188:drug therapy / Q000821:virology*; D006801:Humans; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000008:administration & dosage / Q000627:therapeutic use*; D011092:Polyethylene Glycols / Q000008:administration & dosage / Q000627:therapeutic use*; D012367:RNA, Viral / Q000032:analysis; D011994:Recombinant Proteins; D012189:Retrospective Studies; D012254:Ribavirin / Q000008:administration & dosage / Q000627:therapeutic use*; D013997:Time Factors; D016896:Treatment Outcome; D019562:Viral Load / Q000187:drug effects*
chemical_list: D000998:Antiviral Agents; D004337:Drug Carriers; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D012367:RNA, Viral; D011994:Recombinant Proteins; D011092:Polyethylene Glycols; D012254:Ribavirin; C100416:peginterferon alfa-2a