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
  cancer.
• 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.

Experiment:

•  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.