Total darkness at night key to success of breast cancer therapy, study shows

25 julio 2014

Exposure to light at night, which shuts off nighttime production of the hormone melatonin, renders breast cancer completely resistant to tamoxifen, a widely used breast cancer drug, says a new study. Melatonin by itself delayed the formation of tumors and significantly slowed their growth, researchers report, but tamoxifen caused a dramatic regression of tumors in animals with either high nighttime levels of melatonin during complete darkness or those receiving melatonin supplementation during dim light at night exposure.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/cwIMStBVIeU/140725080408.htm

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