Scientists have developed a DNA blood test that can predict how breast cancer patients will respond to treatment.
The test analyses circulating tumour DNA released into the blood by cancer cells.
Low levels of this DNA before treatment, or after four weeks, were linked to better outcomes.
Researchers studied 167 patients with advanced breast cancer using targeted and combination therapies.
Patients with low tumour DNA levels saw longer periods before their cancer progressed.
The test could help doctors avoid ineffective treatments and switch therapies earlier.
Researchers say it could make cancer care faster, more personalised and more effective.
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