A new 'game-changing' blood test will detect 12 types of cancers. (UK News)

A blood test that could detect 12 cancers is being developed by scientists at a British university, the health secretary has said.

“Just a couple of drops of blood could tell you if you had lung, breast or bladder cancer, helping end months-long waits for tests and scans,” Wes Streeting added.

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This is just hopeful theory?