title: [Correlation, in previously treated HIV-1 positive patients, between hypersensitivity reaction to abacavir and the presence of the HLA-B*5701 allele].
abstract: BACKGROUND
  Hypersensitivity reaction to abacavir (a powerful inverse transcriptase inhibitor) is a serious adverse effect that limits its use in antiretroviral treatment and requires a high level of clinical surveillance. Certain haplotypes of the primary histocompatibility complex proteins (HLA-B*5701) are very significant predictors of the risk of hypersensitivity to this drug. The purpose of this study is to identify the cases where a probable hypersensitivity reaction to abacavir presented the HLA-B*5701 allele.
  
  
  METHODS
  A retrospective study was conducted in all HIV-1 positive adult patients infected treated with abacavir between January 2000 and December 2007, in Department 6 of the Agencia Valenciana de Salud (Valencia Health Agency). The adverse effects developed by the patients were collected to determine which cases presented a probable clinically diagnosed hypersensitivity reaction. Finally, these 39 patients were screened for HLA-B*5701.
  
  
  RESULTS
  In total, 323 patients were treated with abacavir between 2000 and 2007. The treatment was discontinued in 12.1 % (n = 39 patients) presenting a hypersensitivity reaction. Nine (23.1 %) of these were HLA-B*5701 positive. Eight patients presented skin rash and positivity was observed in only single patient with gastrointestinal symptoms and fever.
  
  
  CONCLUSIONS
  The administration of the HLA-B*5701 gene test may be of benefit in clinical practice, because it prevents diagnostic errors of the hypersensitivity reaction and enables more accurate interpretation of the symptoms.
authors.affiliation: Servicio de Farmacia, Hospital Arnau de Vilanova, Valencia, España. nopepri@hotmail.com
authors.forename: Noemí
authors.initials: N
authors.lastname: Pérez Prior
authors.forename: Amparo
authors.initials: A
authors.lastname: Rocher Milla
authors.forename: Enrique
authors.initials: E
authors.lastname: Soler Company
authors.forename: Juan
authors.initials: J
authors.lastname: Flores Cid
authors.forename: Benjamín
authors.initials: B
authors.lastname: Sarria Chust
mesh_terms: D000328:Adult; D000368:Aged; D019380:Anti-HIV Agents / Q000009:adverse effects* / Q000627:therapeutic use; D015224:Dideoxynucleosides / Q000009:adverse effects* / Q000627:therapeutic use; D003875:Drug Eruptions / Q000209:etiology / Q000235:genetics*; D005260:Female; D005334:Fever / Q000139:chemically induced; D005767:Gastrointestinal Diseases / Q000139:chemically induced; D005805:Genes, MHC Class I; D020022:Genetic Predisposition to Disease; D005838:Genotype; D015658:HIV Infections / Q000188:drug therapy*; D015497:HIV-1; D015235:HLA-B Antigens / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D018894:Reverse Transcriptase Inhibitors / Q000009:adverse effects* / Q000627:therapeutic use; D000099227:Abacavir
chemical_list: D019380:Anti-HIV Agents; D015224:Dideoxynucleosides; D015235:HLA-B Antigens; D018894:Reverse Transcriptase Inhibitors; D000099227:Abacavir; C484830:HLA-B*57:01 antigen