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October 18, 1976

Medical News

JAMA. 1976;236(16):1817-1822. doi:10.1001/jama.1976.03270170003001

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NCI workers document the link of ultraviolet light, skin cancer  "We now have physical data, and not merely theoretical calculations, that support the hypothesis that ultraviolet radiation has an effect on the risk to skin cancer (among whites)."So say National Cancer Institute (NCI) researchers, who claim to have established a direct association between the incidence of malignant melanoma and basal or squamous cell carcinoma and measurements of ultraviolet radiation exposure from sunlight. Not surprisingly, they conclude that skin cancer incidence in the United States is greater where ultraviolet radiation levels are higher.Analyzing data compiled in 1974, the investigators say ultraviolet radiation is most intense from 11 AM to 1 PM local standard time, and 60% of the daily total radiation was recorded between 10 AM and 2 PM.Radiation in the wavelength considered to be biologically capable of producing erythema, and probably malignant lesions, was measured as