String of FDA approvals gives momentum to liquid biopsies November 4, 2020 Auto Bot BioPharma, California, Diagnostics, FDA approval, Foundation Medicine, grail, Guardant Health, Illumina, Liquid Biopsy, News 0 Following years of research and investment, liquid biopsies are steadily accumulating FDA approvals. The tests are being used in molecular profiling of solid tumors and as companion diagnostics for targeted cancer therapies.