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Medicineworld.org: Sun exposure early in life and skin cancer

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Sun exposure early in life and skin cancer




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 researchers 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 during the later part of life (between ages 50 to 60 years old). The results indicate that different subtypes of melanoma are linked to different risk factors.



Sun exposure early in life and skin cancer

"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, reported 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.

Scientists 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 melanomas contain the NRAS mutation.

The findings come from the initial phase of a research study that's ongoing that will ultimately include more than 1,000 patients from the U.S. and Australia. The research was funded by the Dermatology Foundation, the National Cancer Institute and the UNC Lineberger Cancer Center.


Posted by: George    Source




Did you know?
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 researchers 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 during the later part of life (between ages 50 to 60 years old). The results indicate that different subtypes of melanoma are linked to different risk factors.

Medicineworld.org: Sun exposure early in life and skin cancer

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