Low Melatonin Associated With Increased Risk Of Breast Cancer

Armen Hareyan's picture

Researchers from Brigham and Women's Hospital have shown in a new study that low melatonin levels are associated with an increased risk of breast cancer in postmenopausal women.


Melatonin is primarily secreted during the dark hours of a light-dark cycle and has been shown to be low in some night workers. Previous research has found that low melatonin levels in premenopausal women are associated with an increased risk of breast cancer.

Schernhammer and colleagues compared melatonin levels in 178 postmenopausal women and 710 matched controls. All of the women were enrolled in the Hormones and Diet in the Etiology of Breast Cancer Risk study.

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