New tests could nearly halve the rate of late-stage cancers, some scientists say — is that true?

Female doctor collecting patient's blood sample for test or donation in medical clinic.

What if a single blood test could determine whether you had one of 14 types of cancer?

That's the question posed by a study published in November in the journal Cancer. Conducted by researchers at the cancer detection-test company Exact Sciences, the paper models how cancer care for five million U.S. adults might be changed by easy access to blood tests designed to spot many cancers — known as multicancer early detection (MCED) liquid biopsy tests.