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An FDA advisory panel voted that Grail's Galleri multicancer early detection (MCED) blood test is safe (10-0) and that its benefits outweigh its risks (7-2), but the panel was split 6-4 on effectiveness — largely because there's still no proof the test reduces cancer mortality. Panelists stressed that Galleri should complement, not replace, standard cancer screenings, and called for robust post-market data before broader conclusions can be drawn.
An FDA advisory panel gave Grail's Galleri multicancer early detection (MCED) blood test a cautious endorsement this week, voting unanimously that it's safe and 7-2 that its benefits outweigh its risks — but the panel was divided 6-4 on whether it's truly effective. The test, which analyzes DNA methylation patterns in cell-free blood DNA to flag signals for more than 50 cancer types, has been available by prescription for $949 but has not yet received FDA approval.
The biggest sticking point: there's no evidence yet that Galleri actually reduces cancer mortality. Both pivotal trials — NHS-Galleri and PATHFINDER 2 — showed modest sensitivity (31.6% and 35%, respectively), meaning the test missed roughly two-thirds of cancers diagnosed within 12 months. Panelists were most encouraged by its ability to detect cancers with no existing screening options, such as pancreatic, esophageal, and ovarian cancers — but cautioned against patients or physicians treating a negative result as an all-clear.
By the Numbers:
Why it matters: A Galleri approval would be a landmark moment — it's the first MCED test to seek FDA clearance, and approval would likely trigger insurance coverage and widespread adoption. However, panelists and cancer experts are urging the FDA to set a high bar, warning that approval without mortality outcome data could open the door to a wave of testing that hasn't yet proven it saves lives — and could further strain already-stretched radiology and endoscopy resources.
