title: [Twenty-four weeks therapy with peginterferon alfa-2a could be similar to 48 weeks therapy in patients with HBeAg positive chronic hepatitis B and good predictors of response: results of a pilot study].
abstract: BACKGROUND
  48 week therapy with peginterferon alfa-2a has demonstrated to be effective in about one third of patients with HBeAg-positive chronic hepatitis B. Although the recommended treatment duration for these patients is 48 weeks, there are no enough data supporting 48 weeks of therapy over 24 weeks of therapy. Treatment might be shortened particularly in patients with good predictors of response.
  
  
  OBJECTIVE
  To compare the efficacy of 48 weeks vs 24 weeks of therapy with peginterferon alfa-2a, in patients with chronic hepatitis B who had good predictors of response.
  
  
  METHODS
  Nineteen patients with high baseline ALT levels (> 3 ULN) and low viral load (HBV DNA < 10(9) copies/ml) were treated with peginterferon alfa-2a 180 mcg/week, during 48 weeks. Virological, biochemical and serological responses were compared with those obtained in 16 patients with similar baseline characteristics treated with peginterferon alfa-2a for 24 weeks. All patients had a followup period of 24 weeks after the end of therapy.
  
  
  RESULTS
  At end of follow-up, HBeAg seroconversion was observed in 7/19 (36.8%) of patients treated for 48 weeks and in 6/16 (37.5%) of patients treated for 24 weeks (NS). Patients treated for 48 weeks evidenced a significantly higher decrease in HBV DNA at the end of therapy than patients treated for 24 weeks (-4.8 logs vs -3.6 logs respectively, p < 0.05). However, the percentage of patients with HBV DNA < 100.000 copies/ml was similar in both groups at the end of follow up (42.1% vs 43.7%, NS). No significant differences between both groups were observed regarding ALT normalization, HBsAg loss or seroconversion. The incidence of aderse events was similar in both groups.
  
  
  CONCLUSIONS
  The results from this pilot study indicate that 24 weeks of therapy with peginterferon alfa-2a could be similar to 48 weeks therapy in patients with HBeAg positive chronic hepatitis B who have good predictors of response.
authors.affiliation: Sección de Hepatología, Servicio de Clínica Médica, Departamento de Medicina, Hospital Italiano de Buenos Aires. CABA, Argentina. joaquin.solari@hospitalitaliano.org.ar
authors.forename: Joaquín
authors.initials: J
authors.lastname: Solari
authors.forename: Omar
authors.initials: O
authors.lastname: Galdame
authors.forename: Lucrecia
authors.initials: L
authors.lastname: Rezzonico
authors.forename: Bernardo
authors.initials: B
authors.lastname: Frider
authors.forename: Alejandra
authors.initials: A
authors.lastname: Villamil
authors.forename: Paola
authors.initials: P
authors.lastname: Casciato
authors.forename: María
authors.initials: M
authors.lastname: Reig
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Bandi
authors.forename: Analía
authors.initials: A
authors.lastname: Alessio
authors.forename: Adrían
authors.initials: A
authors.lastname: Gadano
mesh_terms: D000328:Adult; D000998:Antiviral Agents / Q000008:administration & dosage* / Q000009:adverse effects; D004279:DNA, Viral / Q000097:blood; D004334:Drug Administration Schedule; D005260:Female; D006513:Hepatitis B e Antigens / Q000097:blood*; D019694:Hepatitis B, Chronic / Q000188:drug therapy* / Q000276:immunology; D006801:Humans; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000008:administration & dosage* / Q000009:adverse effects; D008297:Male; D010865:Pilot Projects; D011092:Polyethylene Glycols / Q000008:administration & dosage* / Q000009:adverse effects; D011446:Prospective Studies; D011994:Recombinant Proteins; D013997:Time Factors; D016896:Treatment Outcome; D019562:Viral Load / Q000187:drug effects*
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D006513:Hepatitis B e Antigens; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D011994:Recombinant Proteins; D011092:Polyethylene Glycols; C100416:peginterferon alfa-2a