Genetic analysis of sleep patterns involved n = 177,604 for morning/evening person and n = 133,384 breast cancer cases.
Chronotype, encompassing both morning and evening types, is associated with the risk of overall breast cancer.
Being a morning person is linked to a lower risk of breast cancer in general.
Daytime dozing is connected to a reduced risk of breast cancer overall.
Morning person chronotype shows a negative association with luminal B, HER2-negative-like subtypes.
Daytime dozing is negatively correlated with luminal A-like, luminal B-like, and HER2-enriched-like subtypes.
Simplified
Globally, breast cancer continues to be the leading cause of cancer-related incidence and mortality among females. Research has shown that sleep patterns significantly influence tumor onset and progression. In this research, the association was examined through the application of a two-sample (MR) approach. For the analysis of seven sleep patterns, genetic tools were sourced from both the UK Biobank and 23andMe, including morning/evening person () n = 177,604, morning person (chronotype) n = 248,094, daytime dozing/sleepiness n = 193,472, getting up in the morning n = 193,717, and sleeplessness n = 193,987; sleep duration n = 192,810; and nap during the day n = 166,853. The Breast Cancer Association Consortium (BCAC) supplied genome-wide association studies (GWAS) data, including 133,384 breast cancer cases and 113,789 controls, alongside subtype-specific data with 106,278 cases and 91,477 controls. We discovered that chronotype encompasses both morning and evening types contributes to the risk of overall breast cancer. While daytime dozing and morning person (chronotype) are linked to a lower risk of breast cancer in general, In subtype-specific analyses, morning person (chronotype) was negatively associated with luminal B, HER2-negative-like, and daytime dozing was negatively correlated with luminal A-like, luminal B-like, and HER2-enriched-like. The study corroborates that chronotype is a danger element for breast cancer, aligning with previous observational findings. The association between being a morning person (chronotype) or having daytime dozing and a decreased risk of breast cancer underscores the significance of sleep patterns in formulating strategies for cancer prevention.
Key numbers
1.19
Increased Risk
Odds ratio for overall breast cancer risk associated with .
0.95
Protective Effect
Odds ratio for overall breast cancer risk in morning persons.
0.3
Lower Risk
Odds ratio for luminal A-like breast cancer risk linked to daytime dozing.
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