What is the effect of night shift work on breast cancer risk?

Updated: Dec 16, 2019
  • Author: Jessica Katz, MD, PhD, FACP; Chief Editor: Marie Catherine Lee, MD, FACS  more...
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The International Agency for Research on Cancer and the World Health Organization (IARC/WHO) have recognized night shift work as a probable carcinogen. A 2005 meta-analysis (including 13 studies of airline cabin attendants and nighttime shift workers ) explored the relationship between night work and breast cancer risk and reported a relative risk (RR) of 1.48; they noted similar risk levels in female air cabin crew and female night shift workers (RR of 1.51 vs 1.44, respectively). [33]

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