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Moles and melanoma -- researchers find genetic links to skin cancer
Date:7/6/2009

New research has shown why people with the greatest number of moles are at increased risk of the most dangerous form of skin cancer.

The study, led by Professors Julia Newton Bishop and Tim Bishop of the Melanoma Genetics Consortium (GenoMEL) at the University of Leeds, looked at more than 10,000 people, comparing those who have been diagnosed with melanoma to those who do not have the disease.

Researchers across Europe and in Australia, looked at 300,000 variations in their research subjects' genetic make-up, to pinpoint which genes were most significant in developing melanoma a disease which causes the overwhelming majority of skin cancer related deaths. Their findings are published in the journal Nature Genetics.

Across the large sample, a number of clear genetic patterns emerged.

It is already well known that red-haired people, those with fair skin and those who sunburn easily are most at risk of melanoma, and the people who had been diagnosed with melanoma were found to be much more likely to be carrying the genes most closely associated with red hair and freckles. "This is what we expected to find," said Professor Bishop of the Leeds Institute of Molecular Medicine and the Cancer Research UK Centre at Leeds. "But the links seemed to be much stronger than we anticipated."

"We had known for some time that people with many moles are at increased risk of melanoma. In this study we found a clear link between some genes on chromosomes 9 and 22 and increased risk of melanoma. These genes were not associated with skin colour," he added.

"Instead, in joint research with colleagues at King's College London and in Brisbane who counted the number of moles on volunteer twins, we showed that these genes actually influenced the number of moles a person has."

Around 48,000 people worldwide die of melanoma each year. It is more common in males and those with pale skin and is on the increase. It is widely believed that the increa
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Contact: Simon Jenkins
s.jenkins@leeds.ac.uk
07-791-333-229
University of Leeds
Source:Eurekalert

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