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The incidence of melanoma of the skin is 6 times as high as it was 40 years ago; mortality has stayed low. UV light exposure is the strongest environmental risk factor, but its magnitude gives a relative risk of about 2. The most likely factors influencing the increase are changing thresholds to biopsy pigmented lesions and to label the morphologic change as melanoma.
Welch et al. (Wed,) studied this question.