Blood Test May Show Early Diagnosis For Lung Cancer

A simple blood test that could diagnose lung cancer *long* before symptoms even appear.

The new test works by measuring the immune system's response to lung cancer proteins, much like an HIV test. Experts say it could detect lung cancer a year before a diagnosis, giving patients a head start in beginning treatment.

Researchers at the Fred Hutchinson Cancer Center found the test gave a correct diagnosis just over half of the time (51 percent) and had a false positive rate of 18 percent. But with some improvements, researchers think the blood test, along with CT scans, could be used regularly within five years.

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