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Genetic Variation in XPD, Sun Exposure, and Risk of Skin Cancer

¹ Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School; ² Department of Epidemiology, ³ Department of Biostatistics, ⁴ Harvard Center for Cancer Prevention, and ⁵ Program in Molecular and Genetic Epidemiology, Harvard School of Public Health, Boston, Massachusetts and ⁶ Department of Statistics, Harvard University, Cambridge, Massachusetts

Requests for reprints: Jiali Han, Channing Laboratory, Harvard Medical School, 181 Longwood Avenue, Boston, MA 02115. Phone: 617-525-2098; Fax: 617-525-2008. E-mail: jiali.han{at}channing.harvard.edu

The XPD gene is involved in the nucleotide excision repair pathway removing DNA photoproducts induced by UV radiation. Genetic variation in XPD may exert a subtle effect on DNA repair capacity. We assessed the associations between two common nonsynonymous polymorphisms (Asp³¹²Asn and Lys⁷⁵¹Gln) with skin cancer risk in a nested case-control study within the Nurses' Health Study (219 melanoma, 286 squamous cell carcinoma, 300 basal cell carcinoma, and 874 controls) along with exploratory analysis on the haplotype structure of the XPD gene. There were inverse associations between the Lys⁷⁵¹Gln and Asp³¹²Asn polymorphisms and the risks of melanoma and squamous cell carcinoma. No association was observed between these two polymorphisms and basal cell carcinoma risk. We also observed that the association of the ⁷⁵¹Gln allele with melanoma risk was modified by lifetime severe sunburns, cumulative sun exposure with a bathing suit, and constitutional susceptibility score (P for interaction = 0.03, 0.04, and 0.02 respectively). Similar interactions were also observed for the Asp³¹²Asn. Our data suggest these two XPD nonsynonymous polymorphisms may be associated with skin cancer risk, especially for melanoma.

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