Circadian concepts in normal and neoplastic breast

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Abstract
Normal breast exhibits rhythmic properties linked to the hormonal environment of the gland in animals and humans. Breast tumors also display rhythmic properties; however, they differ from those found normally in animals and humans. Breast cancer in humans is characterized by disruption or modification of normal circadian patterns, which may be of prognostic value. The relationships between melatonin biology and breast cancer require exploration. The present work summarizes the data concerning circadian concepts in breast cancer and explores future directions in the breast cancer treatment by chronomodulation of medications during the 24h, taking advantage of the circadian time structure of breast tissue to improve the treatment outcome.