Carcinogenesis Advance Access originally published online on March 2, 2006
Carcinogenesis 2006 27(8):1670-1675; doi:10.1093/carcin/bgi376
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XPA, haplotypes, and risk of basal and squamous cell carcinoma
1 Department of Epidemiology, Harvard School of Public Health Boston, MA, USA
2 Department of Environmental Health, Harvard School of Public Health Boston, MA, USA
3 Department of Biostatistics, Harvard School of Public Health Boston, MA, USA
4 Department of Genetics and Complex Diseases, Harvard School of Public Health Boston, MA, USA
5 Section of Biostatistics and Epidemiology, Department of Community and Family Medicine and Norris Cotton Cancer Center, Dartmouth Medical School Lebanon, NH, USA
6 Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School Boston, MA, USA
7 Department of Biostatistics and Computational Biology, Dana Farber Cancer Institute Boston, MA, USA
*To whom correspondence should be addressed. Tel: +1 617 432 0037; Fax: +1 617 432 0107; Email: hnelson{at}hsph.harvard.edu
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) in Xeroderma pigmentosum group A (XPA), which codes for an essential protein in NER. We also investigated whether haplotypes of XPA, 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 test P = 0.03) and SCC (ORAG = 0.85, 95% CI (0.67, 1.07); ORAA = 0.74, 95% CI (0.52, 1.05); trend test P = 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). XPA genotype also modified a relationship between SCC and the amount of pigmentation (P = 0.02). Using a haplotype analysis identifying seven common XPA haplotypes 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 in XPA that alters cancer susceptibility.
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