Journal
JOURNAL OF THE AMERICAN COLLEGE OF CARDIOLOGY
Volume 57, Issue 20, Pages 2000-2007Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jacc.2011.02.015
Keywords
KIF6; pharmacogenetics; statin response; vascular risk
Categories
Funding
- UK Medical Research Council
- British Heart Foundation
- Merck and Company
- Roche Vitamins, Ltd.
- Oxford University
- Centre National de Genotypage from Merck and Company
- Cancer Research UK
- BHF Centre for Research Excellence
- MRC [MC_EX_G0801669, MC_U137686853] Funding Source: UKRI
- Medical Research Council [MC_EX_G0801669, MC_U137686853] Funding Source: researchfish
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Objectives The aim of this study was to test the effects of the KIF6 Trp719Arg polymorphism (rs20455) on vascular risk and response to statin therapy in 18,348 participants from the Heart Protection Study. Background There have been claims that noncarriers of the KIF6 719Arg variant receive little benefit from statin therapy. Screening for this genetic variant is now being used to influence statin use. Methods Participants received 40 mg simvastatin daily for 4 to 6 weeks before being randomly allocated 40 mg simvastatin daily or placebo for 5 years. Major coronary event was pre-defined as coronary death or nonfatal myocardial infarction, and major vascular event was pre-defined as major coronary event plus revascularization or stroke. Results The KIF6 genotype was not significantly associated, among placebo-allocated participants, with the risks of incident major vascular events, major coronary events, revascularizations, or strokes. Overall, 40 mg simvastatin daily produced a 42% reduction in low-density lipoprotein cholesterol, which did not differ significantly by KIF6 719Arg carrier status (p = 0.51). Proportional reductions in the risk of major vascular events with statin therapy were similar (interaction p = 0.70) and highly significant across KIF6 genotypes: 23% (95% confidence interval: 16% to 29%; p = 5.3 x 10(-10)) in carriers (Arg/Arg or Trp/Arg), and 24% (95% confidence interval: 17% to 31%; p = 4.6 x 10(-9)) in noncarriers (Trp/Trp). A similar lack of interaction was observed for major coronary events, revascularizations, and strokes considered separately. Conclusions Statin therapy significantly reduces the incidence of coronary and other major vascular events to a similar extent, irrespective of KIF6 genotype. Consequently, the use of KIF6 genotyping to guide statin therapy is not warranted. (Heart Protection Study; ISRCTN48489393) (J Am Coll Cardiol 2011; 57: 2000-7) (C) 2011 by the American College of Cardiology Foundation
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