title: Clinical trial: comparison of weekly once versus twice half-dose weekly administration of pegylated interferon alpha 2b in combination with ribavirin for the treatment of HCV-1 positive patients with chronic hepatitis C.
abstract: BACKGROUND
  Pegylated interferon (PEG-IFN) alpha2b is currently used as a once weekly injection in combination with ribavirin for the treatment of chronic hepatitis C.
  
  
  OBJECTIVE
  To test whether twice half-dose weekly administration may improve the virological response in difficult-to-treat hepatitis C virus-1 patients.
  
  
  METHODS
  Thirty patients were treated with 1.5 microg/kg of PEG-IFN alpha2b given once weekly for 48 weeks (group A) and were compared with 30 patients treated with the same dose of PEG-IFN alpha2b divided in twice weekly doses of 0.75 microg/kg for the initial 4 weeks (group B). All patients were hepatitis C virus-1 positive and received weight-based ribavirin (800-1400 mg/daily).
  
  
  RESULTS
  Weekly twice half-dose administration of PEG-IFN alpha2b for the first 4 weeks was associated with lower rates of biochemical and virological response at all time points compared with a once weekly schedule, and with significantly higher rates of in-therapy breakthrough leading to significantly lower rates of end of therapy response (week 48). The rate of sustained virological response was of 56.7% in group A and 36.7% in group B.
  
  
  CONCLUSIONS
  Weekly twice half-dose administration of PEG-IFN alpha2b is not superior to the standard once weekly schedule, and might be less efficacious.
authors: Venetian Institute of Molecular Medicine (VIMM), Padova, Italy.
authors: G
authors: G
authors: Sebastiani
authors: A
authors: A
authors: Ferrari
authors: S
authors: S
authors: Boccato
authors: R
authors: R
authors: Pistis
authors: A
authors: A
authors: Alberti
mesh_terms: D000328:Adult; D000998:Antiviral Agents / Q000493:pharmacokinetics / Q000627:therapeutic use*; D004305:Dose-Response Relationship, Drug; D004359:Drug Therapy, Combination; D005260:Female; D019698:Hepatitis C, Chronic / Q000188:drug therapy*; D006801:Humans; D007267:Injections; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000493:pharmacokinetics / Q000627:therapeutic use*; D008297:Male; D011092:Polyethylene Glycols; D011237:Predictive Value of Tests; D011994:Recombinant Proteins; D012254:Ribavirin / Q000493:pharmacokinetics / Q000627:therapeutic use*; D016896:Treatment Outcome
chemical_list: D000998:Antiviral Agents; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D011994:Recombinant Proteins; D011092:Polyethylene Glycols; D012254:Ribavirin; C417083:peginterferon alfa-2b