Night shifts linked with high breast cancer risk: Study
June, 19 2018 12:23
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Night shifts linked with high breast cancer risk: Study

By: Shivani Arora

Published on: Sat 19 Aug 2017 10:37 PM

Uttar Pradesh News Portal : Night shifts linked with high breast cancer risk: Study

Women who work in night shifts may be at an increased risk of developing
breast cancer, as artificial light blocks a hormone that plays a key role in
suppressing growth of its tumours, claims a study.

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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 common
    cancer 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 breast
  • 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 circadian
    rhythm 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 to
    residential 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 of
    outdoor light at night those in the top fifth.
  • They had an estimated 14% increased risk of breast cancer, as compared
    with 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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