Objective To explore the association between rs6903956 and severity of coronary artery disease (CAD) in a Chinese population. Methods A cohort of 1075 consecutive patients who underwent coronary arteriography for suspected or known coronary atherosclerosis was enrolled in our study. Coronary atherosclerosis severity was defined by Gensini's Score System and counts of diseased vessels. Results Gensini score frequencies and counts of diseased vessels differed among GG, AG, AA genotype groups at the rs6903956 locus (p = 0.025 for Gensini score frequencies vs. p = 0.024 for counts of diseased vessels, respectively). A univariate logistic regression analysis revealed that the genotype distribution of this SNP was associated significantly with angiographical characteristics of coronary atherosclerosis risk (p = 0.030, odds ratio (OR) = 1.444, 95% confidence interval (CI) = 1.036~2.013 for AG vs. GG; p = 0.021, OR = 5.896, 95% CI = 1.299~26.750 for AA vs. GG and p = 0.007, OR = 1.564, 95% CI = 1.132~2.162 for combined (AG+AA) vs. GG). A multivariate logistic regression analysis indicated that the genotype distribution of the rs6903956 polymorphism be associated significantly with the angiographical characteristics of coronary atherosclerosis risk (p = 0.004, OR = 1.578, 95% CI = 1.155~2.154 for GG vs. AG vs. AA; p = 0.013, OR = 1.541, 95% CI = 1.097~2.163 for GG vs. GA+ AA). A stratification analysis revealed that male subjects and smoking subjects had a higher frequency of the rs6903956 heterozygous mutant among higher Gensini score subjects than among lower Gensini score subjects (p = 0.023, OR = 1.579, 95% CI = 1.064~2.344 for male subgroup; p = 0.005, OR = 2.075, 95% CI = 1.249~3.448 for smoking subgroup). Conclusions Allele A is a risk factor for CAD and the G-to-A allele substitution may underlie the association between rs6903956 and CAD.
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