False negatives, which are more likely for a test such as Galleri, could lead patients to skip recommended screenings. Getting a false positive can cause worry and lead to unnecessary and costly follow-up procedures. In one study, more than half of the people who got a positive result didn’t have cancer. They say there is no research that shows the current test will prevent cancer deaths and warn about the risk of getting false positive or negative results. Some longevity and concierge doctors are offering the test to patients alongside a suite of other new, experimental health screenings including full-body MRI and biological age testing.ĭespite the rise in sales and backing from some doctors, others in medicine are preaching caution. The Galleri test is one of many products tapping into affluent and health-obsessed consumers’ appetite for data on their personal health. More than 130,000 of the prescription-only tests have been sold since Galleri became available in June 2021, according to the test maker Grail, a unit of the gene-sequencing company Illumina. It works by looking for a shared cancer signal in DNA shed by tumors in the bloodstream. The $949 Galleri liquid biopsy can screen for more than 50 types of cancers.
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