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Cancer mutations lurk in healthy skin: these genetic changes not always a sign of an imminent tumor.
By late middle age, about a quarter of skin cells may carry cancer-driving mutations caused by exposure to sunlight --and it's perfectly normal.
Researchers had previously thought that the types of mutations that fuel tumor growth were rare and happened just before a cell becomes cancerous. But a study of the eyelids of four people who don't have cancer reveals that such mutations "are staggeringly common in normal skin," says Philip Jones, a clinical scientist at the University of...
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