Abstract
One of the regulators of physiological rhythm patterns in humans and animals is the change in the circadian cycle implying the day-night alternation. Exposure to light at night has been found to be directly related to serious behavioral problems, as well as to the health state and the development of malignant neoplasms. Epidemiological studies show an increased risk of breast and colon cancer in night shift workers and a reduced cancer risk found in blind women. Currently, a fairly large number of the population is exposed to light pollution (light at night). Therefore experimental studies, revealing the role of abnormalities in the natural light regime in carcinogenesis, become topical.
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