Researchers say blood test can detect cancer years before symptoms

Team based in China develop test that identifies cancers up to four years before signs appear

A blood test can pick up cancers up to four years before symptoms appear, researchers say, in the latest study to raise hopes of early detection.

A team led by researchers in China say the non-invasive blood test - called PanSeer - detects cancer in 95% of individuals who have no symptoms but later receive a diagnosis.