title: Insulin resistance impairs rapid virologic response in HIV/hepatitis C virus coinfected patients on peginterferon-alfa-2a.
abstract: OBJECTIVE
  To investigate the association between insulin resistance and rapid virologic response.
  
  
  METHODS
  All consecutive HIV/hepatitis C virus coinfected patients who started peg-interferon alpha-2a (180 microg/week) and ribavirin 1000-1200 mg/day were analysed.
  
  
  METHODS
  Insulin resistance was defined according to the homeostasis model of assessment-insulin resistance calculated as fasting insulin (mIU/l) x fasting glucose (mmol/l)/22.5. Rapid virologic response was defined as testing negative for hepatitis C virus-RNA after 4 weeks of therapy. Fasting levels of insulin and glucose in plasma were measured in all patients on the first day of treatment. Hepatitis C virus-RNA was determined by quantitative PCR assay (version 3.0). Hepatitis C virus-RNA was measured by qualitative PCR assay (COBAS 2.0) after 4 weeks of treatment.
  
  
  RESULTS
  Seventy-four HIV/hepatitis C virus coinfected patients were enrolled [mean age 41.7 years (SD 5.3), 61 men, 54.1% with advanced fibrosis (F3-4 according to METAVIR classification), 52.4% with infection by hepatitis C virus genotype 1 or 4]. Rapid virologic response was reached by 30 subjects. In the multivariate analysis the independent predictors of rapid virologic response were: genotype 1 or 4 [adjusted odds ratio 0.18 (0.06-0.55)], hepatitis C virus-RNA < 400.000 UI/ml [adjusted odds ratio 0.229 (0.09-0.92)] and homeostasis model of assessment-insulin resistance more than 3.00 [adjusted odds ratio 0.1 (0.05-0.6)].
  
  
  CONCLUSIONS
  The homeostasis model of assessment-insulin resistance score should be evaluated and possibly corrected before starting anti-hepatitis C virus therapy.
authors.affiliation: Institute of Infectious and Tropical Diseases, University of Brescia, Brescia, Italy. paola.nasta@tin.it
authors.forename: Paola
authors.initials: P
authors.lastname: Nasta
authors.forename: Francesca
authors.initials: F
authors.lastname: Gatti
authors.forename: Massimo
authors.initials: M
authors.lastname: Puoti
authors.forename: Giuliana
authors.initials: G
authors.lastname: Cologni
authors.forename: Viviana
authors.initials: V
authors.lastname: Bergamaschi
authors.forename: Federica
authors.initials: F
authors.lastname: Borghi
authors.forename: Alessandro
authors.initials: A
authors.lastname: Matti
authors.forename: Antonella
authors.initials: A
authors.lastname: Ricci
authors.forename: Giampiero
authors.initials: G
authors.lastname: Carosi
mesh_terms: D000328:Adult; D000998:Antiviral Agents / Q000627:therapeutic use*; D001786:Blood Glucose / Q000032:analysis; D004334:Drug Administration Schedule; D005215:Fasting; D005260:Female; D005838:Genotype; D006678:HIV / Q000235:genetics; D015658:HIV Infections / Q000188:drug therapy / Q000378:metabolism / Q000821:virology*; D016174:Hepacivirus / Q000235:genetics; D019698:Hepatitis C, Chronic / Q000188:drug therapy / Q000378:metabolism / Q000821:virology*; D006706:Homeostasis; D006801:Humans; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011092:Polyethylene Glycols / Q000627:therapeutic use*; D016133:Polymerase Chain Reaction / Q000379:methods; D012367:RNA, Viral / Q000032:analysis; D011994:Recombinant Proteins; D012254:Ribavirin / Q000627:therapeutic use; D016896:Treatment Outcome; D019562:Viral Load
chemical_list: D000998:Antiviral Agents; D001786:Blood Glucose; D007328:Insulin; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D012367:RNA, Viral; D011994:Recombinant Proteins; D011092:Polyethylene Glycols; D012254:Ribavirin; C100416:peginterferon alfa-2a