A magnetic wire could revolutionise blood tests for cancer.
Blood tests are seen as the future for cancer detection, catching the disease early by picking up cells from tumours in the bloodstream.
However, there are so few of these cells that a regular blood sample may contain none.
Now US scientists have the answer in the form of a magnetised wire which attracts tumour cells. Researchers at Stanford University found they can inject magnetic nano- particles containing an antibody which clings to the cells from tumours.
Blood tests allow doctors to target cancers based on their genetic make-up, which differs between patients.