title: A functional polymorphism in the promoter region of leptin gene increases susceptibility for non-small cell lung cancer.
abstract: Leptin hormone and receptor have been associated to cancer development and were identified in lung tissue. In this study, a functional polymorphism in the 5' flanking region of the leptin gene (LEP -2548 G/A) was found to increase susceptibility for non-small cell lung cancer [odds ratio (OR), 1.97; 95% confidence interval (CI), 1.13-3.43]. Age-adjusted logistic regression analysis in men indicated an association of AA genotype with adenocarcinoma (OR, 4.29; CI, 1.64-11.72) and squamous cell carcinoma (OR, 3.19; CI, 1.26-8.13). Logistic regression analysis confirmed the AA genotype as an independent risk factor for lung cancer after adjustment for age and gender (OR, 2.57; CI, 1.34-4.92). The AA genotype was overrepresented only in patients with non-metastatic disease (OR, 1.86; CI, 1.13-3.04). Kaplan-Meier analysis demonstrated an earlier age of onset for lung cancer in AA carriers (P=0.023). Results suggest the existence of genetic susceptibility for lung cancer in carriers of this LEP functional polymorphism. Further studies are warranted to extend knowledge of leptin involvement in lung cancer.
authors.affiliation: Molecular Oncology--CI, Portuguese Institute of Oncology, Porto, Portugal.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Ribeiro
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Araújo
authors.forename: Ana
authors.initials: A
authors.lastname: Coelho
authors.forename: Raquel
authors.initials: R
authors.lastname: Catarino
authors.forename: Daniela
authors.initials: D
authors.lastname: Pinto
authors.forename: António
authors.initials: A
authors.lastname: Araújo
authors.forename: Carmen
authors.initials: C
authors.lastname: Calçada
authors.forename: Carlos
authors.initials: C
authors.lastname: Lopes
authors.forename: Rui
authors.initials: R
authors.lastname: Medeiros
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D020738:Leptin / Q000235:genetics*; D008175:Lung Neoplasms / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D020738:Leptin