Journal Article

<i>MDM2</i> gene promoter polymorphisms and risk of lung cancer: a case–control analysis

Guojun Li, Xiaodong Zhai, Zhengdong Zhang, Robert M. Chamberlain, Margaret R. Spitz and Qingyi Wei

in Carcinogenesis

Volume 27, issue 10, pages 2028-2033
ISSN: 0143-3334
Published online May 2006 | e-ISSN: 1460-2180 | DOI:
MDM2 gene promoter polymorphisms and risk of lung cancer: a case–control analysis

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The MDM2 protein negatively regulates p53 expression level in modulating DNA repair, cell-cycle control, cell growth and apoptosis. Polymorphisms in the promoter region of the MDM2 gene have been shown to alter protein expression and may, thus, play a role in carcinogenesis. To test our hypothesis that the MDM2 promoter polymorphisms are associated with risk of lung cancer, we conducted a hospital-based, case–control study of 1026 non-Hispanic white patients newly diagnosed with lung cancer and 1145 cancer-free controls who were frequency-matched by age (±5 years), sex, ethnicity and smoking status. We genotyped for the MDM2 promoter G2580T (also called SNP309) and G2164A polymorphisms that have a minor allele frequency >0.05. The distributions of the MDM2-2580G variant allele and genotypes were significantly less common among the cases than among the controls (P = 0.038 and 0.045, respectively), but this was not evident for MDM2-2164G (P = 0.865 and 0.614, respectively). Compared with the MDM2-2580TT genotype, the MDM2-2580G variant genotypes were associated with a decreased risk of lung cancer [odds ratio = 0.81 and 95% confidence interval = 0.67–0.98 for GT, 0.83 (0.63-1.08) for GG, and 0.81 (0.68-0.97) for the combined GT/GG genotype]. However, no significant association was observed between the MDM2-2164G variant genotypes and lung cancer risk. Our results suggest that the MDM2-2580G allele may be a marker of reduced genetic susceptibility to lung cancer in the non-Hispanic white population, a finding that seems to contradict previous reports.

Journal Article.  5295 words. 

Subjects: Clinical Cytogenetics and Molecular Genetics

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