Blood test detects breast cancer before any sign of a lump

A blood test that detects breast cancer more than a year before any symptoms appear could dramatically improve survival rates.

The test looks for raised levels of a certain protein that is already known to increase once cancer has developed. But in a new study, researchers found levels of the protein, called epidermal growth factor receptor, were already high up to 17 months before women were diagnosed with breast cancer.

The test, announced at the recent annual meeting of the American Association for Cancer Research in Washington DC, could herald a breakthrough in the search for a so-called 'biomarker' that indicates the presence of cancer before the patient or doctors suspect anything is wrong.