Peginterferon alfa-2a in patients with chronic hepatitis C

N Engl J Med. 2000 Dec 7;343(23):1666-72. doi: 10.1056/NEJM200012073432301.


Background: Covalent attachment of a 40-kd branched-chain polyethylene glycol moiety to interferon alfa-2a results in a compound (peginterferon alfa-2a) that has sustained absorption, a slower rate of clearance, and a longer half-life than unmodified interferon alfa-2a. We compared the clinical effects of a regimen of peginterferon alfa-2a with those of a regimen of interferon alfa-2a in the initial treatment of patients with chronic hepatitis C.

Methods: We randomly assigned 531 patients with chronic hepatitis C to receive either 180 microg of peginterferon alfa-2a subcutaneously once per week for 48 weeks (267 patients) or 6 million units of interferon alfa-2a subcutaneously three times per week for 12 weeks, followed by 3 million units three times per week for 36 weeks (264 patients). All the patients were assessed at week 72 for a sustained virologic response, defined as an undetectable level of hepatitis C virus RNA (<100 copies per milliliter).

Results: In the peginterferon group, 223 of the 267 patients completed treatment and 206 completed follow-up. In the interferon group, 161 of the 264 patients completed treatment and 154 completed follow-up. In an intention-to-treat analysis in which patients who missed the examination at the end of treatment or follow-up were considered not to have had a response at that point, peginterferon alfa-2a was associated with a higher rate of virologic response than was interferon alfa-2a at week 48 (69 percent vs. 28 percent, P=0.001) and at week 72 (39 percent vs. 19 percent, P=0.001). Sustained normalization of serum alanine aminotransferase concentrations at week 72 was also more common in the peginterferon group than in the interferon group (45 percent vs. 25 percent, P=0.001). The two groups were similar with respect to the frequency and severity of adverse events, which were typical of those associated with interferon alfa.

Conclusions: In patients with chronic hepatitis C, a regimen of peginterferon alfa-2a given once weekly is more effective than a regimen of interferon alfa-2a given three times weekly.

Publication types

  • Clinical Trial
  • Comparative Study
  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Antiviral Agents / adverse effects
  • Antiviral Agents / therapeutic use*
  • Drug Administration Schedule
  • Female
  • Hepacivirus / genetics
  • Hepacivirus / isolation & purification
  • Hepatitis C, Chronic / drug therapy*
  • Humans
  • Injections, Subcutaneous
  • Interferon alpha-2
  • Interferon-alpha / adverse effects
  • Interferon-alpha / therapeutic use*
  • Logistic Models
  • Male
  • Polyethylene Glycols / adverse effects
  • Polyethylene Glycols / therapeutic use*
  • RNA, Viral / blood
  • Recombinant Proteins
  • Treatment Outcome


  • Antiviral Agents
  • Interferon alpha-2
  • Interferon-alpha
  • RNA, Viral
  • Recombinant Proteins
  • Polyethylene Glycols
  • peginterferon alfa-2a