Researchers in the US have found a standard chemotherapy drug used for breast cancer could inadvertently be encouraging recurrence of the disease.
Doctors delivered the chemotherapy drug Taxan to both a cell model and a mouse model of breast cancer.
They found that some surrounding healthy cells were harmed, releasing molecules which woke up nearby dormant cancer cells.
Dr Ramya Ganesan from Emory University spoke to Ingrid Hipkiss.
