No link between breast cancer and working night shifts, researchers say
Working night shifts has little or no effect on a womans risk of developing breast cancer, say UK researchers.
A 2007 review by the International Agency for Research on Cancer classified shift work as a probable cause of cancer, because it disrupts the body clock.
But new research followed 1.4 million women across 10 studies, including a combination of new results and older data from the United States, China, Sweden and the Netherlands.
Funded by the UK Health and Safety Executive, Cancer Research UK and the UK Medical Research Council, the study represents the largest of its kind.
Researchers found the incidence of breast cancer was essentially the same whether someone did no night shift work at all or worked night shifts for several decades....
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