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Environmental medicine." researchers compared over 1,100 breast cancer patients with a like number of women who have no history of breast cancer. about a third of the women worked at jobs where they spend at least half their time on evening or night shifts. the breast cancer risk was more than twice as high for women with 30 years or more of night shift work. in this study the risk was even higher for women in health occupations. scientists suspect that it may involve melatonin which regulates daily body rhythms. and they think increased light exposure on night shifts may depress melatonin pro...

Environmental medicine." researchers compared over 1,100 breast cancer patients with a like number of women who have no history of breast cancer. about a third of the women worked at jobs where they spend at least half their time on evening or night shifts. the breast cancer risk was more than twice as high for women with 30 years or more of night shift work. in this study the risk was even higher for women in health occupations. scientists suspect that it may involve melatonin which regulates daily body rhythms. and they think increased light exposure on night shifts may depress melatonin pro...