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Should we warn against night shifts to prevent breast cancer?
  1. H A Kolstad1,
  2. M Erlandsen2,
  3. P Frost1,
  4. J P Bonde3
  1. 1Department of Occupational Medicine, Aarhus University Hospital, Århus, Denmark
  2. 2Department of Biostatistics, University of Aarhus, School of Public Health, Århus, Denmark
  3. 3Department of Occupational and Environmental Medicine, Copenhagen University Hospital Bispebjerg, Copenhagen, Denmark
  1. Correspondence to Dr Henrik A Kolstad, Department of Occupational Medicine, Aarhus University Hospital, Norrebrogade 44, DK-8000 Århus C, Denmark; henkol{at}

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In Denmark, breast cancer has been recognised as an occupational disease since the International Agency for Research on Cancer (IARC) decided in 2007 that shift work involving circadian disruption is probably carcinogenic to humans.1 Compensation has been given to 26 nurses, 12 nursing assistants, four physicians and 14 workers from other occupations who had worked night shifts for more than 20 years. This has caused public concern …

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  • Competing interests None.

  • Provenance and peer review Not commissioned; not externally peer reviewed.