Mutations that drive cancer lurk in healthy skin

Changes not so rare — nor a sign of imminent tumor growth

eyelid

EYE-OPENER  Normal skin is a patchwork of cells, many of which carry cancer-driving mutations, a new study finds. In a representation of normal skin, colors indicate the mutated genes and circles reflect the size of skin patches from healthy eyelids carrying the mutation.

I. Martincorena et al/Science 2015, I. Martincorena

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