title: CHRNA3 genetic polymorphism and the risk of lung cancer in the Chinese Han smoking population.
abstract: Lung cancer is the leading cause of cancer-related deaths worldwide that result from the combined effected of smoking exposure and genetic susceptibility. CHRNA3, a nicotinic acetylcholine receptor gene, was associated with lung cancer risk. The aim of this study was to identify whether CHRNA3 polymorphisms increase lung cancer risk directly or indirectly through smoking behavior in the Chinese Han individuals. We conducted a case-control study including 228 individuals with lung cancer and 301 healthy individuals. Seventeen known SNPs within CHRNA3 were selected for genotyping. Odds ratios (OR) and 95 % confidence interval (CI) were calculated by unconditional logistic regression with adjustment for gender and age. Two SNPs (rs8042059 and rs7177514) showed a 1.54-fold (p = 0.036; 95 % CI = 1.03-2.32) and 1.52-fold (p = 0.043; 95 % CI = 1.01-2.27) increased risk for lung cancer in smokers, respectively. Rs8042059 also showed a significant association for variant genotypes (CA/AA) compared with the wild-type genotype (CC), with an OR = 1.84 (p = 0.042; 95 % CI, 1.02-3.33) in the dominant model. In addition, the haplotype analysis found that the haplotypes "TCAC" and "CTGT," composed of rs938682, rs12914385, rs11637630, and rs2869546, were associated with a 1.79-fold and 501-fold increased lung cancer risk, respectively. However, the polymorphisms of all SNPs were not significantly different between controls and cases among general or nonsmokers population. Rs8042059 and rs7177514 may increase lung cancer risk indirectly through smoking behavior in the Chinese Han population.
authors: School of Life Sciences, Northwest University, Xi'an, 710069, Shaanxi, China.
authors: Wenjing
authors: W
authors: Zhou
authors: Tingting
authors: T
authors: Geng
authors: Huijuan
authors: H
authors: Wang
authors: Xiaojie
authors: X
authors: Xun
authors: Tian
authors: T
authors: Feng
authors: Hui
authors: H
authors: Zou
authors: Longli
authors: L
authors: Kang
authors: Tianbo
authors: T
authors: Jin
authors: Chao
authors: C
authors: Chen
mesh_terms: D000328:Adult; D000483:Alleles; D044466:Asian People; D002681:China; D005260:Female; D056726:Genetic Association Studies; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D011978:Receptors, Nicotinic / Q000235:genetics*; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects*
chemical_list: D011978:Receptors, Nicotinic
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