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. 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 and prompted demands for setting limits for the duration of night shift work. We therefore reviewed exposure-response data for night shift work and breast cancer risk based on previously published epidemiological data.
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