Polymorphism of VEGF gene in susceptibility to chronic immune-mediated inflammatory diseases: a meta-analysis

Background Vascular endothelial growth factor (VEGF) is an important angiogenic factor and may be connected with chronic immune-mediated inflammatory diseases (IMIDs) to some extent. However, previous researches about the relationship between the +405G>C (dbSNP: rs2010963) polymorphism in VEGF gene and the risk of IMIDs are controversial and inconsistent. So we conducted this meta-analysis to assess whether the relationship between the +405G>C polymorphism in the 5'-UTR region of VEGF gene and IMID susceptibility exists. Methods Our literature search was conducted on the PubMed, Embase, Web of science, Chinese National Knowledge Infrastructure, and Chinese Biomedical databases to retrieve for eligible studies. Odds ratios as well as their 95 % confidence intervals were utilized to deduce the possible relationship. Results A total number of 5175 patients with IMIDs and 7069 healthy controls from 27 case-control studies were included. For the overall eligible data collected in our meta-analysis, there was no marked relationship between +405G>C polymorphism and the risk of IMIDs. However, subgroup analysis by ethnicity suggested that +405C allele could be a protective factor for IMIDs in Asians, whereas an opposite conclusion was drawn in Caucasians. Conclusion Thus, we may come to the conclusion that the VEGF +405G>C polymorphism could be associated with IMIDs, and the correlation might vary with ethnic groups.