Abstract：
:Recent three genome-wide association studies have mapped a lung cancer susceptibility locus to chromosome 15q25 in Caucasians. However, the reported risk single nucleotide polymorphisms (SNPs) are extremely rare in Asians, arguing against any of these being causative variants. This study sought to identify other variants on 15q25 associated with lung cancer susceptibility in Chinese. Two-stage case-control studies were conducted in subjects derived from both Northern and Southern China. The first-stage, consisting of 576 cases and 576 controls, was to discover novel risk variants using a haplotype-tagging SNP approach, and these variants were then replicated in the second-stage, consisting of 2,989 cases and 2,880 controls. Associations were estimated by logistic regression models, and function of the variants was examined by biochemical assays. We found that the three risk SNPs reported in Caucasians were not associated with lung cancer risk in Chinese. However, we identified four novel SNPs (rs2036534C>T, rs667282C>T, rs12910984G>A, and rs6495309T>C) that were associated with significantly increased lung cancer risk and smoking behavior, which were all confirmed in the replication analyses [odds ratios (95% confidence intervals) in the dominant model: 1.39 (1.23-1.57; P = 2.3 x 10(-7)), 1.52 (1.35-1.71; P = 2.0 x 10(-12)), 1.44 (1.28-1.63; P = 2.7 x 10(-9)), and 1.43 (1.27-1.61; P = 2.6 x 10(-9)), respectively]. We characterized the rs6495309T>C change in the CHRNA3 promoter as a functional variant because it affected the Oct-1 binding ability, resulting in increased CHRNA3 expression. These results support 15q25 as a susceptibility region for lung cancer in Chinese but underscore the difference in genetic markers among different ethnic populations.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Wu C,Hu Z,Yu D,Huang L,Jin G,Liang J,Guo H,Tan W,Zhang M,Qian J,Lu D,Wu T,Lin D,Shen Hdoi
10.1158/0008-5472.CAN-09-0081subject
Has Abstractpub_date
2009-06-15 00:00:00pages
5065-72issue
12eissn
0008-5472issn
1538-7445pii
0008-5472.CAN-09-0081journal_volume
69pub_type
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