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The carcinogenic effect of UVA irradiation
The Journal of Investigative Dermatology
|December 1, 1983
Summary
Ultraviolet A (UVA) radiation exposure, following initial UVB and UVA exposure, increased skin tumor incidence in hairless mice. Continued UVA exposure appears to enhance carcinogenic effects, suggesting wavelength attenuation may reduce risks.
Area of Science:
- Dermatology
- Photobiology
- Carcinogenesis
Background:
- Ultraviolet (UV) radiation is a known carcinogen.
- The specific role of UVA in skin cancer development, particularly after UVB exposure, requires further elucidation.
Purpose of the Study:
- To investigate the carcinogenic effects of UVA radiation in hairless mice, especially after prior combined UVB and UVA exposure.
- To determine if prolonged UVA exposure influences tumor incidence and if wavelength modification impacts these effects.
Main Methods:
- Seven groups of hairless mice were exposed to different UV radiation regimens.
- Irradiation involved combined UVB/UVA, followed by filtered UVA for varying durations (2, 4, or 6 months).
- Tumor incidence was monitored over 58 weeks.
Main Results:
- Combined UVB and UVA irradiation followed by filtered UVA for 2-6 months marginally increased tumor incidence (p < 0.05).
- UVA alone did not induce tumors.
- Tumor incidence showed a trend of increasing with the duration of subsequent UVA exposure.
Conclusions:
- Subsequent UVA irradiation following initial UVB/UVA exposure can enhance skin tumor development in hairless mice.
- The photoaugmentative carcinogenic effect of UVA may be reduced by filtering shorter wavelengths.
- Duration and total dose of UVA exposure appear to correlate with increased tumor incidence.