Britain begins world's largest trial of blood test for 50 types of cancer

Britain's state-run National Health Service will on Monday begin the world's biggest trial of Grail Inc's flagship Galleri blood test that can be used to detect more than 50 types of cancer before symptoms appear.

The Galleri test looks at the DNA in a patient's blood to determine if any come from cancer cells. Earlier diagnosis of cancers leads to dramatically increased survival rates.

The NHS said it wanted to...