title: Genetic polymorphisms of MDM2, cumulative cigarette smoking and nonsmall cell lung cancer risk.
abstract: Abnormalities of the tumor suppressor TP53 pathway are critical in the development of many cancers since it regulates cell cycle components and apoptosis. Murine double minute-2 (MDM2) protein is a central node in the p53 pathway and a direct negative regulator of p53. The MDM2 SNP309 (rs2279744) polymorphism increases MDM2 RNA and protein levels, attenuating the p53 pathway. The MDM2 SNP309 polymorphism was investigated in 1,787 Caucasian nonsmall cell lung cancer (NSCLC) patients and 1,360 healthy controls. Cases and controls were analyzed for associations with genotype and adjusted for age, gender, histology and smoking history. There were no overall associations between the MDM2 genotypes and risk of lung cancer (adjusted odds ratios [AORs] = 0.82 [95% confidence interval [CI] = 0.6-1.1] for the T/G genotype and AOR = 1.32 [95% CI = 0.9-2.0] for the G/G genotype). A statistically significant interaction (p = 0.01) was found between smoking and MDM2 genotypes. Consistent with this interaction, stratified analysis by pack-years of smoking demonstrated that the AORs of G/G vs. T/T were 1.56 (1.0-2.7), 1.46 (1.0-2.2), 0.80 (0.5-1.3) and 0.63 (0.4-1.1), respectively, for never, mild (<30 pack-years), moderate (30-57 pack-years) and heavy smokers (>or=58 pack-years). In conclusion, a strong gene-smoking interaction was observed between the MDM2 SNP309 and NSCLC risk.
authors.affiliation: Applied Molecular Oncology/Department of Medicine, Ontario Cancer Institute/Princess Margaret Hospital, University of Toronto, Toronto, ON, Canada. geoffrey.liu@uhn.on.ca
authors.forename: Geoffrey
authors.initials: G
authors.lastname: Liu
authors.forename: Paul
authors.initials: P
authors.lastname: Wheatley-Price
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Sohee
authors.initials: S
authors.lastname: Park
authors.forename: Rebecca S
authors.initials: RS
authors.lastname: Heist
authors.forename: Kofi
authors.initials: K
authors.lastname: Asomaning
authors.forename: John C
authors.initials: JC
authors.lastname: Wain
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Lynch
authors.forename: Li
authors.initials: L
authors.lastname: Su
authors.forename: David C
authors.initials: DC
authors.lastname: Christiani
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018287:Carcinoma, Large Cell / Q000235:genetics; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics*; D002294:Carcinoma, Squamous Cell / Q000235:genetics; D004252:DNA Mutational Analysis; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D020641:Polymorphism, Single Nucleotide; D011379:Prognosis; D051736:Proto-Oncogene Proteins c-mdm2 / Q000235:genetics*; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects*
chemical_list: C497206:MDM2 protein, human; D051736:Proto-Oncogene Proteins c-mdm2