Association between COX-2 polymorphisms and non-small cell lung cancer susceptibility.

AIM To explore the association between COX-2 polymorphisms and non-small cell lung cancer (NSCLC) susceptibility. METHODS We collected fasting peripheral venous blood from 60 cases with NSCLC and 62 healthy controls through physical examinations, and applied PCR-RFLP to analyze COX-2 polymorphisms of two groups. RESULTS With respect to detecting COX-2 rs689466 and rs5275 polymorphisms, the distribution frequency of mutant genotype AA of COX-2 rs689466 in case group was higher than that in control group, which possessed significant difference between two groups (P<0.05). Carriers with AA genotype were 4.05 times at risk of NSCLC than those with GG genotype (P = 0.04, OR=4.05, 95% CI=1.14-14.43). The distribution of mutant genotype CC of COX-2 rs5275 was different between two groups, and carriers with genotype CC were at 5.70 times higher risk of NSCLC than those with genotype TT. After corrected by sex, gender, smoking and drinking factors, AA genotype of COX-2 rs689466 and CC genotype of COX-2 rs5275 still contributed to increased risk of NSCLC (OR=4.22, 95% CI=1.10-16.17, OR=6.95, 95% CI=1.27-38.11). After analyzed of linkage disequilibrium (LD) and haplotypes of alleles in two SNPs, the distribution frequency of A-C haplotype in case group was higher than that in control group, with significant difference between two groups (P<0.05). After corrected by sex, gender, smoking and drinking factors, statistical difference was still found in the total distribution of A-C haplotype between two groups (P=0.03, OR=6.11, 95% CI=1.16-32.2). CONCLUSIONS COX-2 rs689466 and rs5275 polymorphisms may be related to NSCLC susceptibility. And A-C haplotype might be a susceptibility haplotype for NSCLC.