Breast cancer spreads at night, new research shows, which could help target the spread of the disease. Tumours are most active while women sleep - making daytime therapy less effective.
Researchers found they are fuelled by the hormone melatonin - produced in response to darkness. The findings also have implications for when breast biopsies are carried out.
Project leader Professor Nicola Aceto explained: "When the affected person is asleep, the tumour awakens."
