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Background  Vascular endothelial growth factor (VEGF) is thought to play an important role in the pathogenesis of diabetic retinopathy (DR). Previous studies have associated the  VEGF  rs2146323 polymorphism with the risk of DR. However, the results of these studies are inconsistent. A meta-analysis was performed to evaluate the association between the  VEGF  rs2146323 polymorphism and the risk of DR.    Methods  The PubMed, EMBASE, Web of Science and Google Scholar literature databases until March 2015 were searched. The differences in the studies were expressed in the form of an odds ratio (OR) and the corresponding 95 % confidence interval (CI). Heterogeneity among the studies was tested using the I 2  statistic based on the Q test.    Results  A total of four studies (598 cases and 709 controls) were included in the meta-analysis. A significant association was found involving the rs2146323 polymorphism in the dominant model (CA + AA VS. CC) (OR = 1.38, CI = 1.10–1.72,  P  = 0.005) and the co-dominant model (CA VS. CC) (OR = 1.37, CI = 1.08–1.74,  P  = 0.008).    Conclusions  Our meta-analysis confirmed the association between the  VEGF  rs2146323 polymorphism and the risk of DR.

Association between a vascular endothelial growth factor gene polymorphism (rs2146323) and diabetic retinopathy: a meta-analysis