title: Relation of CYP2C19 loss-of-function polymorphism to the occurrence of stent thrombosis.
abstract: BACKGROUND
  Major adverse cardiovascular events including stent thrombosis associated with residual platelet reactivity on antiplatelet treatment in high risk vascular patients is a hot issue that needs a strong effort to be solved. Dual antiplatelet therapy with clopidogrel and aspirin prevents ischemic events and improves outcomes following acute coronary syndromes and percutaneous coronary intervention. However, adverse cardiovascular events occur in these patients, and several studies have shown that patients who suffer cardiovascular complications have high post-treatment platelet reactivity despite antiplatelet treatment. Clopidogrel requires conversion to active metabolite by CYP isoenzymes. Recently, CYP2C19*2 polymorphism (G681A nucleotide substitution) has been shown to be associated with decreased metabolisation of clopidogrel, poor antiaggregant effect and increased adverse cardiovascular events.
  
  
  METHODS
  This review summarises the principal studies contributing to establish the relationship between CYP2C19*2 polymorphism and adverse outcomes in high risk patients on clopidogrel treatment.
  
  
  CONCLUSIONS
  Prospective studies are urgently needed to determine the clinical impact of a score that takes into account individual characteristics of patients - CYP2C19*2 genotypes, residual platelet reactivity, drug-drug interaction, as well as traditional and procedural risk factors - for the identification of the therapeutic strategy that provides the best benefit for the single subject.
authors.affiliation: University of Florence and SOD Atherothrombotic Diseases, Department of Medical and Surgical Critical Care, AOU Careggi, Viale Morgagni 85, 50134 Florence, Italy. betti.giusti@unifi.it
authors.forename: Betti
authors.initials: B
authors.lastname: Giusti
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Gori
authors.forename: Rossella
authors.initials: R
authors.lastname: Marcucci
authors.forename: Rosanna
authors.initials: R
authors.lastname: Abbate
mesh_terms: D001189:Aryl Hydrocarbon Hydroxylases / Q000235:genetics* / Q000378:metabolism*; D000077144:Clopidogrel; D065731:Cytochrome P-450 CYP2C19; D005260:Female; D006801:Humans; D008297:Male; D015607:Stents / Q000009:adverse effects*; D013927:Thrombosis / Q000209:etiology / Q000517:prevention & control*; D013988:Ticlopidine / Q000031:analogs & derivatives* / Q000378:metabolism / Q000627:therapeutic use
chemical_list: D000077144:Clopidogrel; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19; D013988:Ticlopidine