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Sun exposure early in life linked to specific skin cancer gene mutation

Skin cancers often contain different gene mutations, but just how these mutations contribute to the cause of melanomas has been a mystery.

A new clue comes from scientists at the University of North Carolina at Chapel Hill Schools of Medicine and Public Health. Their research indicates that early life sun exposure, from birth to 20 years old, may specifically increase the risk of melanomas with BRAF gene mutations. A different mutation, on the NRAS gene, was found in patients who had sun exposure later in life (between ages 50 to 60 years old). The results indicate that different subtypes of melanoma are associated with different risk factors

"The findings suggest that melanoma subtypes have different causes. This is important for learning more about how to prevent and treat skin cancer," said Dr. Nancy Thomas, associate professor of dermatology in the UNC School of Medicine, a member of the UNC Lineberger Comprehensive Cancer Center and lead author of the study. This finding is expected to strengthen current recommendations to protect children from sun exposure in order to prevent melanoma, Thomas said.

The study, published in the May 2007 edition of the journal Cancer Epidemiology Biomarkers and Prevention, presents some of the first data to link early life sunlight exposure to a specific mutation in melanomas.

Researchers interviewed 214 melanoma patients in North Carolina about their risk factors for melanoma and about the various places they had lived. Each patient's UV sun exposure was estimated from their residential history and satellite-base measurements. DNA from the patients' melanomas was then analyzed for mutations.

Patients with melanomas that contained the BRAF mutation, found in about half of all melanomas, were more likely to report high levels of sun exposure before age 20. People with the NRAS mutation were more likely to have had high exposure between the ages of 50 and 60. About 15 percent of me
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Source:University of North Carolina School of Medicine


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