title: MDM2 SNP309 polymorphism contributes to endometrial cancer susceptibility: evidence from a meta-analysis.
abstract: OBJECTIVE
  The SNP309 polymorphism (T-G) in the promoter of MDM2 gene has been reported to be associated with enhanced MDM2 expression and tumor development. Studies investigating the association between MDM2 SNP309 polymorphism and endometrial cancer risk reported conflicting results. We performed a meta-analysis of all available studies to explore this association.
  
  
  METHODS
  All studies published up to August 2013 on the association between MDM2 SNP309 polymorphism and endometrial cancer risk were identified by searching electronic databases PubMed, Web of Science, EMBASE, and Chinese Biomedical Literature database (CBM). The association between the MDM2 SNP309 polymorphism and endometrial cancer risk was assessed by odds ratios (ORs) together with their 95% confidence intervals (CIs).
  
  
  RESULTS
  Eight case-control studies with 2069 endometrial cancer cases and 4546 controls were identified. Overall, significant increase of endometrial cancer risk was found when all studies were pooled in the meta-analysis (GG vs. TT: OR = 1.464, 95% CI 1.246-1.721, P < 0.001; GG vs. TG + TT: OR = 1.726, 95% CI 1.251-2.380, P = 0.001; GG + TG vs. TT: OR = 1.169, 95% CI 1.048-1.304, P = 0.005). In subgroup analysis by ethnicity and HWE in controls, significant increase of endometrial cancer risks were observed in Caucasians and studies consistent with HWE. In subgroup analysis according to study quality, significant associations were observed in both high quality studies and low quality studies.
  
  
  CONCLUSIONS
  This meta-analysis suggests that MDM2 SNP309 polymorphism contributes to endometrial cancer susceptibility, especially in Caucasian populations. Further large and well-designed studies are needed to confirm this association.
authors.forename: Qiliu
authors.initials: Q
authors.lastname: Peng
authors.forename: Cuiju
authors.initials: C
authors.lastname: Mo
authors.forename: Aiping
authors.initials: A
authors.lastname: Qin
authors.forename: Xianjun
authors.initials: X
authors.lastname: Lao
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Chen
authors.forename: Jingzhe
authors.initials: J
authors.lastname: Sui
authors.forename: Junrong
authors.initials: J
authors.lastname: Wu
authors.forename: Limin
authors.initials: L
authors.lastname: Zhai
authors.forename: Shi
authors.initials: S
authors.lastname: Yang
authors.forename: Xue
authors.initials: X
authors.lastname: Qin
authors.forename: Shan
authors.initials: S
authors.lastname: Li
mesh_terms: D016889:Endometrial Neoplasms / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D020641:Polymorphism, Single Nucleotide; D051736:Proto-Oncogene Proteins c-mdm2 / Q000235:genetics* / Q000378:metabolism; D012307:Risk Factors
chemical_list: C497206:MDM2 protein, human; D051736:Proto-Oncogene Proteins c-mdm2