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Findings about the association between chronotype (morning or evening preference) and risk for breast cancer have been inconsistent. Mendelian randomization uses genetic variants highly associated with chronotype, sleep duration, and insomnia symptoms to help clarify this association. In addition to performing a multivariable regression analysis based on self-reported preferences for morning or evening among >150,000 women (age range, 40–70) participating in the U.K. Biobank, researchers used genetic variants identified in these women in a Mendelian randomization analysis to investigate how sleep traits might influence breast cancer risk. Prevalent and incident invasive breast cancers (during a median follow-up of 2.98 years) were assessed.…