Night shifts linked with high breast cancer risk: Study

Night shifts linked with high breast cancer risk: Study

Women who work in night shifts may be at an increased risk of developingbreast cancer, as artificial light blocks a hormone that plays a key role insuppressing growth of its tumours, claims a study.READ ALSO:Supportive partner leads to success!

According to a Study:

  • The study showed that women who were premenopausal and were current or past smokers.
  • And also who live in areas with high levels of outdoor light at night.
  •  In addition, were at risk of developing breast cancer - the most commoncancer in women worldwide.
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According to Experts:

  • In our modern industrialised society, artificial lighting is nearly ubiquitous.
  •  Our results suggest that this widespread exposure to outdoor lights during night time hours could represent a novel risk factor for breastcancer.
  • Melatonin, a hormone produced in the human brain, appears to suppress the growth of breast cancer tumours.
  • But exposure to light may decrease its levels, thus disrupting circadianrhythm our internal "clocks" that govern sleepiness and alertness.
  • And, in turn, lead to increased breast cancer risk.


  •  For the new study, the team looked at data from nearly 110,000 women.
  • In addition, linked data from satellite images of Earth taken at night toresidential addresses for each study participant.
  • As well as considering the influence of night shift work.
  • The results showed that women exposed to the highest levels ofoutdoor light at night those in the top fifth.
  • They had an estimated 14% increased risk of breast cancer, as comparedwith women in the bottom fifth of exposure.
  • As levels of outdoor light at night increased, so did breast cancer rates,the researchers said. But acknowledged that further work is required to confirm the study findings and clarify potential mechanisms.

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