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Saturday, September 18, 2004 6:35:14 AM
J Invest Dermatol. 2004 Oct;123(4):760-762.
Epidermal Growth Factor Gene (EGF) Polymorphism and Risk of Melanocytic Neoplasia.
James MR, Hayward NK, Dumenil T, Montgomery GW, Martin NG, Duffy DL.
Queensland Institute of Medical Research, Brisbane, Australia.
A common single nucleotide polymorphism (SNP) in the 5' untranslated region (5'UTR) of the epidermal growth factor (EGF) gene modulates the level of transcription of this gene and hence is associated with serum levels of EGF. This variant may be associated with melanoma risk, but conflicting findings have been reported. An Australian melanoma case-control sample was typed for the EGF+61A>G transversion (rs4444903). The sample comprised 753 melanoma cases from 738 families stratified by family history of melanoma and 2387 controls from 645 unselected twin families. Ancestry of the cases and controls was recorded, and the twins had undergone skin examination to assess total body nevus count, degree of freckling and pigmentation phenotype. SNP genotyping was carried out via primer extension followed by matrix-assisted laser desorption time of flight (MALDI-TOF) mass spectroscopy. The EGF+61 SNP was not found to be significantly associated with melanoma status or with development of nevi or freckles. Among melanoma cases, however, G homozygotes had thicker tumors (p=0.05), in keeping with two previous studies. The EGF polymorphism does not appear to predispose to melanoma or nevus development, but its significant association with tumor thickness implies that it may be a useful marker of prognosis.
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