A team from the UK’s Institute of Cancer Research (ICR) used an ultra-sensitive liquid biopsy to detect the presence of tiny amounts of cancer DNA left in the body following treatment for early breast cancer.
Researchers were able to identify all patients in a study who went on to relapse by detecting very low levels of cancer found in the blood - known as molecular residual disease.
More research is planned, but the ICR said the results "lay the groundwork for better post-treatment monitoring and potentially life-extending treatment".