title: Comparison of metformin versus rosiglitazone in patients with Acanthosis nigricans: a pilot study.
abstract: BACKGROUND
  Acanthosis nigricans (AN) is a skin condition commonly present on the neck of obese subjects. Obesity is often accompanied by insulin resistance and/or hyperinsulinemia. Metformin and rosiglitazone are 2 pharmacologic agents useful in conditions characterized by insulin resistance.
  
  
  OBJECTIVE
  The aim of our study was to compare the efficacy of metformin versus rosiglitazone on AN lesions of the neck as well as their effects on metabolic and anthropometric variables.
  
  
  METHODS
  This 12-week randomized, open-label pilot study involved overweight or obese subjects with AN treat with either metformin (n=4) or rosiglitazone (n=3).
  
  
  RESULTS
  Only the rosiglitazone group showed a significant reduction in insulin levels. No effect on the severity of AN was observed, but modest improvements of skin texture occurred in both treatment groups.
  
  
  CONCLUSIONS
  Metformin and rosiglitazone were well-tolerated. Although efficacy on skin lesions was very modest, their use in acanthotic subjects might be useful during longer treatment periods.
authors.affiliation: Centro Dermatologico Ladislao de la Pascua, Mexico City, Mexico.
authors.forename: Paula
authors.initials: P
authors.lastname: Bellot-Rojas
authors.forename: Rosalinda
authors.initials: R
authors.lastname: Posadas-Sanchez
authors.forename: Nacu
authors.initials: N
authors.lastname: Caracas-Portilla
authors.forename: Jose
authors.initials: J
authors.lastname: Zamora-Gonzalez
authors.forename: Guillermo
authors.initials: G
authors.lastname: Cardoso-Saldaña
authors.forename: Fermin
authors.initials: F
authors.lastname: Jurado-Santacruz
authors.forename: Carlos
authors.initials: C
authors.lastname: Posadas-Romero
mesh_terms: D000052:Acanthosis Nigricans / Q000097:blood / Q000188:drug therapy* / Q000473:pathology; D000284:Administration, Oral; D000328:Adult; D005260:Female; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D008297:Male; D008687:Metformin / Q000008:administration & dosage / Q000627:therapeutic use*; D009765:Obesity; D010865:Pilot Projects; D000077154:Rosiglitazone; D045162:Thiazolidinediones / Q000008:administration & dosage / Q000627:therapeutic use*; D016896:Treatment Outcome
chemical_list: D007004:Hypoglycemic Agents; D007328:Insulin; D045162:Thiazolidinediones; D000077154:Rosiglitazone; D008687:Metformin