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Action spectrum for ultraviolet carcinogenesis

R G Freeman

    National Cancer Institute Monograph
    |December 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Ultraviolet radiation (UVR) wavelengths between 300-320 nm are most potent for skin cancer development in mice, mirroring human erythema action spectra. Shorter 290 nm wavelengths did not induce tumors, suggesting a specific UV range for carcinogenic effects.

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    Area of Science:

    • Dermatology
    • Photobiology
    • Oncology

    Background:

    • Ultraviolet radiation (UVR) is a known carcinogen, with wavelengths between 290-320 nm implicated in skin cancer.
    • Previous studies established the 290-320 nm range but lacked specific comparative data on wavelength efficacy.
    • The long wavelength limit of 320 nm was based on limited experimental evidence.

    Purpose of the Study:

    • To investigate the hypothesis that the action spectrum for UV-induced carcinogenesis parallels the erythema action spectrum.
    • To provide specific comparative data on the carcinogenic potency of different UV wavelengths.
    • To determine the efficacy of UV wavelengths from 290 nm to 320 nm in inducing skin tumors.

    Main Methods:

    • Albino mice were exposed to UV radiation from a monochromator at 290, 300, 310, and 320 nm.

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  • UV exposure levels were calibrated to match the erythema action spectrum of untanned Caucasian skin.
  • Mice were exposed thrice weekly until 50% developed tumors, with squamous cell carcinomas being the endpoint.

    • Main Results:

    • Squamous cell carcinomas developed at similar rates and frequencies when UV exposure was proportional to the erythema spectrum.
    • Carcinogenic potency decreased from 300 nm to 310 nm and then to 320 nm.
    • No tumors were observed in mice exposed to 290 nm UV radiation.

    Conclusions:

    • The action spectrum for UV carcinogenesis in mice closely follows the erythema action spectrum.
    • UV wavelengths between 300-320 nm are significantly more potent carcinogens than 290 nm.
    • These findings refine our understanding of UV wavelength-specific skin cancer risk.