Identifying tumours using blood samples is possible, but researchers are still working out how to validate and deploy multi-cancer tests.

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Experts worry early detection tests like Galleri and CancerGuard are unproven and could drive up health care costs by triggering unnecessary screenings.

The $689 Cancerguard test is designed for annual screenings for adults ages 50-84 with no known cancer diagnosis in the last three years.

Exact Sciences announced recently the launch of Cancerguard, a multi-cancer early detection (MCED) blood test that is now available as a laboratory-developed