Data from three new UK studies and from a review of currently available evidence, published in the Journal of the National Cancer Institute, indicates that night shift work has little or no effect on breast cancer incidence.
Compared with women who had not reported doing night shift work, the combined relative risks taking all 10 studies together were 0.99 for any night shift work, 1.01 for 20 or more years of night shift work, and 1.00 for 30 or more years night shift work. In other words, the incidence of breast cancer was essentially the same whether someone did no night shift work at all or did night shift work for several decades.
Study mentioned:
Ruth C. Travis, Angela Balkwill, Georgina K. Fensom, Paul N. Appleby, Gillian K. Reeves, Xiao-Si Wang, Andrew W. Roddam, Toral Gathani, Richard Peto, Jane Green, Timothy J. Key, and Valerie Beral
Night Shift Work and Breast Cancer Incidence: Three Prospective Studies and Meta-analysis of Published Studies
JNCI J Natl Cancer Inst (2016) 108 (12): djw169 doi:10.1093/jnci/djw169
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