Squamous Cell Tumors Induced in Hairless Mice with Ultraviolet Light

The incidence of skin cancer in exposed parts of the body and particularly in fair-skinned persons residing in regions of the world where solar energy is the highest has indicated that squamous cell tumors of human skin are related to exposure to sunlight (1, 2). In animals, only the squamous cell carcinomas about the eyes of the cow have been related to ultraviolet (3). Squamous cell tumors are not frequent in the animal kingdom, but they have been found in dogs, horses, cows and mice, and in certain kinds of fowl and fish (4).