(Harvard T.H. Chan School of Public Health) Women who live in areas with higher levels of outdoor light at night may be at higher risk for breast cancer than those living in areas with lower levels, according to a large long-term study from Harvard T.H. Chan School of Public Health. The link was stronger among women who worked night shifts.
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High exposure to outdoor light during the night may increase women's breast cancer risk, a new study finds, particularly for women who work night shifts.