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Nucleotide excision repair (NER) is instrumental in removing DNA lesions caused by ultraviolet (UV) radiation, the dominant risk factor for keratinocyte carcinoma, including basal cell carcinoma (BCC) and squamous cell carcinoma (SCC). We evaluated whether BCC or SCC risk was influenced by the A23G single nucleotide polymorphism (SNP) inXeroderma pigmentosum group A(XPA), which codes for an essential protein in NER. We also investigated whether haplotypes ofXPA, determined by seven haplotype-tagging SNPs, better define susceptibility to keratinocyte carcinoma. Incident cases of BCC and SCC from New Hampshire were identified through dermatologists and pathology laboratories. Population-based controls were frequency-matched to cases by gender and age. Cases of BCC (886) and of SCC (682) were compared with controls (796). Models controlled for age, gender, pigmentation factors and severe sunburns and were restricted to Caucasians. Using GG as the reference, the A allele was less frequent among cases of BCC (ORAG= 0.82, 95% CI (0.66, 1.01); ORAA= 0.74, 95% CI (0.53, 1.03); trend testP= 0.03) and SCC (ORAG= 0.85, 95% CI (0.67, 1.07); ORAA= 0.74, 95% CI (0.52, 1.05); trend testP= 0.05) than controls. Risk from ≥3 severe sunburns was elevated for those with the GG genotype only, and this interaction was nearly significant for BCC (P= 0.07).XPAgenotype also modified a relationship between SCC and the amount of pigmentation (P= 0.02). Using a haplotype analysis identifying seven commonXPAhaplotypes indicated that the A23G polymorphism alone captured the differences in susceptibility to keratinocyte carcinoma. The common G allele of the A23G polymorphism was associated with an increased risk of BCC and SCC and this polymorphism appeared to be the determining polymorphism inXPAthat alters cancer susceptibility.

XPA , haplotypes, and risk of basal and squamous cell carcinoma