9p21 Polymorphisms increase the risk of peripheral artery disease in the Han Chinese population

Objective: A case-control study to investigate the association of the 9p21 single nucleotide polymorphisms (SNPs) rs10757274 and rs10757278 (known to be associated with coronary artery disease [CAD] risk) with peripheral arterial disease (PAD), in a Han Chinese population. Methods: The rs10757274 and rs10757278 genotypes of patients with PAD, and age-and sex-matched control subjects, were determined. Multivariate unconditional logistic regression analyses were performed, with adjustments for age, sex, hypertension, dyslipidaemia, diabetes and smoking status. Results: The study included 420 patients with PAD and 418 control subjects. Variant forms of both SNPs were associated with increased risk of PAD in the total study population, when excluding patients with CAD or stroke (additive genetic model). The GG haplotype increased the risk of PAD, but this association did not remain significant after further sensitivity analysis. Both SNPs were associated with PAD risk in patients aged <65 years, but not in those aged >= 65 years (additive model). Conclusions: 9p21 is associated with PAD. When stratified according to age, 9p21 increases PAD risk in individuals aged <65 years, but not in those aged >= 65 years.