© 2000 by Oxford University Press
Journal of the National Cancer Institute, Vol. 92, No. 9, 686-689,
May 3, 2000
© 2000 Oxford University Press
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Researchers Search For Link Between Circadian Rhythms, Breast Cancer
Could the amount of light, the time of day, or the season of the year affect cancer development and/or best possible time of treatment? The answer may lie in the study of circadian rhythms and chronobiology. The fact that some regulatory hormones are influenced by circadian rhythms may be critically important to cancer screening and chemotherapy administration.
The hormone melatonin, produced by the pineal gland in the brain and secreted at a rate that is suppressed by exposure to environmental lighting, is frequently cited as the key circadian hormone and one
Estrogen Receptors
Photoreceptors