Dim lighting may weaken breast-cancer drug’s effects

July 25, 2014 11:13 AM

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Dim lighting may weaken breast-cancer drug’s effects

Rats taking tamoxifen who were exposed to dim lighting at night didn’t produce normal amounts of melatonin, and their tumors grew quickly as a result. But when they were given a melatonin supplement, their tumors shrank.

Exposure to dim lighting at night might reduce the effects of tamoxifen, a popular breast cancer drug, because it suppresses melatonin production, a new study has found.

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