BACKGROUND Single nucleotide polymorphisms of vitamin K epoxide reductase complex subunit 1 (VKORC1) was reported to have association with arterial vascular disease. We investigated whether single nucleotide polymorphism of VKORC1 +2255 is associated with clinical outcomes among patients who underwent drug-eluting stent (DES) implantation.

METHODS We prospectively collected genomic DNA in patients who underwent DES deployment from September 2003 to December 2006 and compared clinical outcomes according to their VKORC1 genotype at the locus + 2255 (rs 2359612). The primary end point was composite of atherothrombotic events (cardiac death, myocardial infarction, and nonhemorrhagic stroke).

RESULTS Mean follow-up duration was 631 +/- 251 days. Genotyping was completed in 764 cases (TT genotype [n = 640, 83.8%] vs non-TT [CC or CT] genotype [n = 124, 16.2%]). Non-TT group showed more composite events than TT group (7.3% vs 3.0%, P = .032). In the Cox regression analysis, non-TT genotype of VKORC gene was a significant predictor of atherothrombotic events (hazard ratio 2.56, 95% confidence interval 1.14-5.78). In the event-free survival analysis, non-TT group also showed significantly poorer cardiovascular events-free survival rate than TT group (P = .02).

CONCLUSIONS VKORC1 genotype is associated with cardiovascular events in patients with DES implantation, suggesting the role of coagulation system.