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Night shiftwork and breast cancer risk: overall evidence
  1. Johnni Hansen,
  2. Richard G Stevens
  1. Institute of Cancer Epidemiology, Danish Cancer Society, Denmark
  1. Correspondence to Dr Johnni Hansen, Institute of Cancer Epidemiology, Danish Cancer Society, Strandboulevarden 49, DK-2100 Copenhagen, Denmark; johnni{at}

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Kolstad et al claim in a letter that “warnings against long-term night shift work to prevent breast cancer are not evidence based”.1 However, 24 scientists convened by the International Agency for Research on Cancer (IARC) have concluded, based on sufficient evidence in experimental animals, limited evidence in humans and strong bio-mechanistic support, that “shiftwork that involves circadian disruption is probably carcinogenic to …

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  • Competing interests None.

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