Rat Study Suggests Light At Night Might Hamper Breast Cancer Therapy, Tulane University School of Medicine Reveals

A study in rats hints that exposure to dim light at night may make human breast cancer tumors resistant to the chemotherapy drug doxorubicin. However, giving the rats a melatonin supplement prevented this light-linked resistance to doxorubicin, the most widely used cancer chemotherapy drug in the world. Prior rat-based research by the same investigators found that exposure to dim light at night boosted human breast cancer tumors' resistance to the breast cancer drug tamoxifen.

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