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Heart. 2012 Jan;98(2):139-44. doi: 10.1136/hrt.2011.227272. Epub 2011 Jun 23.

Association of cytochrome P450 2C19*2 polymorphism with clopidogrel response variability and cardiovascular events in Koreans treated with drug-eluting stents.

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  • 1Department of Internal Medicine, Cardiovascular Center, Seoul National University Hospital, 28 Yongong-dong, Chongno-gu, Seoul, Korea.

Abstract

BACKGROUND:

Although East Asians carry the cytochrome P450 (CYP) 2C19*2 allele more frequently than do Caucasians, the impact of the CYP2C19*2 allele on clopidogrel pharmacodynamics and clinical outcomes is unknown.

OBJECTIVE:

To evaluate the effect of CYP2C19 variants on clopidogrel pharmacodynamics and long-term prognosis in East Asian patients with drug-eluting stents (DES).

METHODS:

DES-treated patients taking dual antiplatelet therapy were enrolled from a Korean multicentre genetic registry. The CYP2C19*2 allele was genotyped using the Taqman method (n=2146), and on-treatment platelet reactivity was measured with the VerifyNow P2Y12 assay (n=1415).

RESULTS:

1011 patients (47%) carried at least one CYP2C19*2 allele. The mean on-treatment platelet reactivity was significantly higher in carriers than in non-carriers (250±76 vs 231±83 P2Y12 reaction unit, p<0.001). For up to 12 months' follow-up, the composite of cardiovascular death, non-fatal myocardial infarction and stent thrombosis was significantly higher in carriers of the CYP2C19*2 allele than non-carriers (2.0% vs 0.8%, p=0.02). On landmark analysis, there was no difference in clinical outcome after 12 months between the groups.

CONCLUSION:

The CYP2C19*2 genetic variant may be associated with worse outcome in Korean patients treated exclusively with DES and dual-antiplatelet therapy due to a significant increase in cardiac death, myocardial infarction or stent thrombosis.

PMID:
21700758
[PubMed - indexed for MEDLINE]
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