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Clock disruption speeds breast cancer in models (Level A1) — a close up of a purple and red substance

Clock disruption speeds breast cancer in modelsCEFR A1

29 Dec 2025

LevelA1
A2
B1
B2

Adapted from Texas A&M University, Futurity • CC BY 4.0

Photo by National Cancer Institute, Unsplash

Level A1 – Beginner
2 min
76 words
  • The human body has a 24-hour clock.
  • This clock controls sleep, hormones and repair.
  • Scientists studied mice that had cancer.
  • Some mice had a normal light cycle.
  • Other mice had a disturbed light cycle.
  • Disturbed light made tumors grow faster and earlier.
  • Tumors were more likely to spread to lungs.
  • The immune system became weaker and less active.
  • Healthy breast tissue became more vulnerable to cancer.
  • Researchers want to help people who work at night.

Difficult words

  • hormone — chemical in body that changes how cells act
    hormones
  • repair — process of fixing or healing body parts
  • tumor — a mass of abnormal cells in the body
    tumors
  • immune system — body system that fights infections and disease
  • disturb — to make something not normal or regular
    disturbed
  • vulnerable — easy to harm or get disease

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Do you sleep at the same time every day?
  • Do you sleep with a light on or off?
  • Have you ever worked at night?

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