Sunscreens for delay of ultraviolet induction of skin tumors

Journal Article · Sun Aug 01 00:00:00 EDT 1982 · J. Am. Acad. Dermatol.; (United States)

DOI:https://doi.org/10.1016/S0190-9622(82)70108-2· OSTI ID:6490291

Wulf, H C; Poulsen, T; Brodthagen, H; Hou-Jensen, K

Sunscreens with different sun protection factors (SPFs) have been tested for their capability of delaying or preventing actinic damage and skin cancer development in groups of hairless, pigmented mice exposed to artificial ultraviolet (UV) light of increasing intensity. The dose delivered was less than or equal to 1 minimal erythema dose (MED) in the group of untreated mice, so that the mice to which sunscreens were applied never obtained a sunburn after UV exposure. The quality of UV light was similar to bright midday sun at a latitude of 56 degrees (city of Copenhagen). Tumorigenesis was demonstrated to be delayed corresponding to the SPF claimed by the manufacturer, but almost all of the UV-irradiated mice developed skin tumors. Histologic examination revealed actinic degeneration and tumors of squamous cell type with marked variation in differentiation. Metastases to lymph nodes and lungs were found in only 10%. Toxic reactions, such as eczematous-like skin reactions, dark coloring, and amyloidosis, were observed predominantly in the group treated with the sunscreen of highest SPF value. Long-term investigations seem to be necessary to unveil these problems--in particular, the specific SPF value, in sunscreens, that should be recommended to the public for prevention or delay of actinic damage and/or cancer development.

• Research Organization: Department of Dermatology, The Finsen Institute, Copenhagen, Denmark
• OSTI ID: 6490291
• Journal Information: J. Am. Acad. Dermatol.; (United States), Vol. 7:2
• Country of Publication: United States
• Language: English

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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
RADIOPROTECTIVE SUBSTANCES
RADIOSENSITIVITY EFFECTS
SKIN
BIOLOGICAL RADIATION EFFECTS
CARCINOGENESIS
METASTASES
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RADIATION EFFECTS
RADIATIONS
RODENTS
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560152* - Radiation Effects on Animals- Animals