We found a significantly increased risk of lung cancer development in XPD genotype Lys/Gln (OR=1.94; 95% CI=1.10-3.43; p=0.015) and in the gene combinations: XPD Lys/Gln+XPC Lys/Gln (OR=6.5; 95% CI=1.53-27.49; p=0.009) and XPD Lys/Gln+XPC Gln/Gln(OR=5.2; 95% CI=1.07-25.32; p=0.04).
The objective of this study is to investigate the relationship between the polymorphisms of two DNA repair genes, the nucleotide excision repair xeroderma pigmentosum group D (XPD) gene (codons 312 and 751) and the base excision repair X-ray repair cross-complementing group 1 (XRCC1) gene (codon 399), and p53 mutations among lung cancer patients.
These results support the hypothesis that both the XPD 751 C and 312 A are risk alleles and individuals with the XPD 751 CC and 312 AA genotypes are at higher risk of developing lung cancer.
The haplotype ERCC2rs3916874(G) and rs238415(C) [OR (95% CI)=1.26 (1.02-1.57), P=0.03] in block 1 and the haplotype PPP1R13L rs4803817(A), CD3EAP rs1046282(T), rs735482(C), ERCC1 rs3212980(A), rs3212964(G) [OR (95% CI)=3.56 (1.55-8.18), P=0.005] in block 3 were associated with lung cancer risk.
These associations were: two SNPs rs1799793 and rs13181 in the ERCC2 gene and lung cancer (recessive model) and rs1805794 in the NBN gene and bladder cancer (dominant model).
In conclusion, this meta-analysis suggested ERCC2Asp312Asn polymorphism may increase the risk of lung cancer among Asians, whereas not among Caucasians.