Occupational Cancer

No effect from night shifts on woman’s breast cancer risk


Working night shifts has little or no effect on a woman’s breast cancer risk despite a review in 2007 by the International Agency for Research on Cancer (IARC) classifying shift work disrupting the “body clock” as a probable cause of cancer, according to new research. At the time of the 2007 classification there was limited evidence about breast cancer risk in humans so the classification was mainly based on a combination of animal and lab studies.