[No authors listed]
Single nucleotide polymorphisms (SNPs) at the KIF6 (kinesin like protein 6, rs20455 or 719Arg), LPA (lipoprotein(a), rs3798220), TAS2R50 (taste receptor type 2, member 50, rs1376251) and VAMP8 (vesicle-associated membrane protein 8, rs1010) have previously been associated with low density lipoprotein cholesterol (LDL-C) lowering response to statins, coronary heart disease (CHD) at baseline, or CHD events on trial. We examined SNPs at the KIF6 (rs20455 or 719Arg), LPA (rs3798220), TAS2R50 (rs1376251) and VAMP8 (rs1010) in 5,411 participants in (PROspective Study of Pravastatin in the Elderly at Risk) (mean age 75.3 years), who had been randomized to pravastatin 40 mg/day or placebo and were followed for a mean of 3.2 years. No SNP was related to vascular disease at baseline. Only the KIF6 SNP was related to LDL-C lowering with homozygous Arg 719 subjects being significantly less responsive than other groups (p=0.025, -34.2 vs. -36.1%). With regard to the primary CHD endpoint on trial (fatal or non-fatal myocardial infarction or stroke), we observed a significant relationship for KIF6 719Arg homozygotes (p=0.03, hazards ratio 0.47, 12.8% of the population) in women on pravastatin only, and for TAS2R50 for the AA genotype (p=0.03, hazards ratio 1.76, 8.9% of the population), also only in women on pravastatin. Our data indicate that the assessment of KIF6 rs20455 and TAS2R50 rs1376251 genotypes are not useful for predicting statin induced cardiovascular risk reduction in men, but do predict CHD risk reduction in women in this elderly population. However, these differences are no longer significant after correction for multiple comparisons, and we do not recommend the assessment of any of these SNPs in clinical practice.
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