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Reason
Ronald Bailey

The Biomedical Testing Revolution Promises a Theranos That Actually Works

"Cancer signal not detected." That was the happy finding of my Galleri multi-cancer early detection (MCED) blood test from the Silicon Valley biotech company GRAIL. The Galleri test presages an emerging wave of new precision biomedical tests produced by a panoply of biotech startups.

GRAIL's MCED test analyzes DNA shed by both normal and cancerous cells into a person's bloodstream, looking for telltale epigenetic changes that affect the way genes operate. Specific changes are associated with the presence of cancer cells.

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