Association between C-reactive protein gene ＋1059 G/C polymorphism and the risk of coronary heart disease： a meta-analysis

Background C-reactive protein （CRP） gene ＋1059 G/C polymorphism has been reported to be associated with coronary heart disease （CHD） risk, but the results remain inconclusive. This meta-analysis was therefore conducted to clarify these controversies. Methods A comprehensive search was conducted to identify all case control studies on the association between CRP gene ＋1059 G/C polymorphism and CHD risk. All the related studies were further strictly selected according to the inclusion criteria. Meta-analysis was performed with STATA 10.1 （StataCorp, USA）. The association was assessed by odds ratio （OR） and 95% confidence interval （C/）; both Begg＇s funnel plot and Egger＇s regression test were used to assess the publication bias. Results This meta-analysis on a total of 13 studies comprising 6316 CHD cases and 4467 controls showed no significant association between CRP gene ＋1059 G/C polymorphism and CHD risk in the overall study （for C/C＋C/G vs. G/G： OR=1.01, 95% C/=0.81-1.25, P=0.96; for C/C vs. C/G＋G/G： OR=1.17, 95% C/=0.77-1.77, P=0.47; for C/C vs. G/G： 0R=1.17, 95% C/=0.77-1.77, P=0.47; for C allele vs. G allele： 0R=1.01, 95% C/=0.81-1.24, P=-0.96）. However, in the subgroup analysis by ethnicity, the results showed significant association between CRP gene ＋1059 G/C polymorphism and CHD risk among Caucasians （for C/C vs. G/G： OR=2.54, 95% C1=1.13-5.72, P=0.02; C/C vs. C/G＋G/G： OR=2.45, 95% C1=1.09-5.51, P=-0.03）, but not among Asians and Africans （P 〉0.05）. Conclusion CRP gene ＋1059 G/C polymorphism may be associated with increased CHD risk among Caucasians and more evidences need to validate the conclusion.