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Studies on Bovine Ocular Squamous Carcinoma ("Cancer Eye") XI. Effects of Sunlight

The University of Texas M.D. Anderson Hospital and Tumor Institute, Houston

Abstract

Disposal records from nine herds and pertaining to 4,960 animals whose ages ranged from 2 to 18 years were used to investigate the effect of sunlight on "cancer eye". The age-adjusted incidence increased significantly with: (1) increase in average annual hours of sunshine; (2) decrease in average latitude; and (3) increase in average altitude. These criteria were thought to reflect differences in the ultraviolet component of sunlight. Other evidence of an association between sunlight and cancer in the bovine, man and laboratory animals was also mentioned.

¹ Department of Biology. This is publication No. 11 of the Cancer Eye Study Section. The investigation was supported by Grant C-2890 from the National Cancer Institute of the National Institutes of Health, Public Health Service. The authors wish to express their appreciation and gratitude to Doyle Chambers, Oklahoma State University, for his suggestions during the study; and to Jay L. Lush, Iowa State University, for his valuable criticisms and suggestions during the preparation of the manuscript. Appreciation is expressed to personnel of the California, Montana, Nevada, New Mexico, Oregon, and South Dakota State Agricultural Experiment Stations and of the Animal Husbandry Research Division, U.S. Department of Agriculture, for making cattle and records available. Apprecia- tion is also expressed to the Turner Ranch, Sulphur, Oklahoma for placing their records at our disposal.