April 2021
![](https://www.emfsa.co.za/wp-content/uploads/2021/05/NTP-MONOGRAPH-NL.jpg)
Summary of NTP Cancer Hazard Conclusions Exposure Circumstances That Cause Circadian Disruption:
Persistent Night Shift Work
Certain Lighting Conditions
https://ntp.niehs.nih.gov/ntp/results/pubs/cancer_assessment/lanfinal20210400_508.pdf
Selected images:
![](https://www.emfsa.co.za/wp-content/uploads/2021/05/Figure-2017-Nobel-Prize.jpg)
![](https://www.emfsa.co.za/wp-content/uploads/2021/05/Monograph-Light.jpg)
![](https://www.emfsa.co.za/wp-content/uploads/2021/05/Monograph-North-America.jpg)
NTP Review of Shift Work at Night, Light at Night, and Circadian Disruption
Topic Overview
Status: NTP cancer hazard assessments
Conclusion(s): NTP concluded that
(1) persistent night shift work can cause breast cancer in women and
(2) certain lighting conditions may be linked to cancer.
https://ntp.niehs.nih.gov/whatwestudy/assessments/cancer/completed/shiftwork/index.html