title: Lack of association between the MDM2-SNP309 polymorphism and breast cancer risk.
abstract: BACKGROUND
  A T-to-G polymorphism (SNP309) at the promoter region of MDM2 has been recently reported to extend the Sp1 binding site that positively regulates the MDM2 transcription level and consequently, its expression level. MDM2 is the negative regulator of p53 tumor suppressor protein and elevated levels of MDM2 hamper the stress response driven by the p53 pathway. Whether MDM2-SNP309 was associated with breast cancer as a predisposing factor was investigated.
  
  
  METHODS
  A case-control study of 223 females diagnosed with breast cancer and 149 female controls sampled from the Turkish population was carried out and the T/G MDM2-SNP309 genotype of participants was determined.
  
  
  RESULTS
  There was no significant association of the G/G or G/T genotypes with breast cancer risk (odds ratio (OR) 1.14, 95% confidence interval (CI) 0.59-2.22, and OR 1.20, 95% CI 0.67-2.12, respectively). Stratification of the data for onset age or for menopausal status at the time of diagnosis also revealed no association for either group.
authors.affiliation: Department of Molecular Biology and Genetics, Faculty of Science, Bilkent University, 06800, Ankara, Turkey.
authors.forename: Aslihan
authors.initials: A
authors.lastname: Petenkaya
authors.forename: Betul
authors.initials: B
authors.lastname: Bozkurt
authors.forename: Ozlem
authors.initials: O
authors.lastname: Akilli-Ozturk
authors.forename: Hatice Seda
authors.initials: HS
authors.lastname: Kaya
authors.forename: Bala
authors.initials: B
authors.lastname: Gur-Dedeoglu
authors.forename: Isik G
authors.initials: IG
authors.lastname: Yulug
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D001943:Breast Neoplasms / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D051736:Proto-Oncogene Proteins c-mdm2 / Q000235:genetics*; D014421:Turkey
chemical_list: C497206:MDM2 protein, human; D051736:Proto-Oncogene Proteins c-mdm2