Natera Responds to Meritless Lawsuit and Files False Advertising Claim Against Guardant for Misleading Oncologists News provided by Share this article Share this article AUSTIN, Texas, May 28, 2021 /PRNewswire/ -- Natera, Inc. (NASDAQ: NTRA), a pioneer and global leader in cell-free DNA (cfDNA) testing, today announced it has been sued by Guardant Health, in an attempt to stop Natera from exposing Guardant Reveal's™ true test performance and the differences between tumor-informed and tumor-naive molecular residual disease (MRD) tests. Natera has filed a claim against Guardant in the U.S. District Court for the Western District of Texas, (Docket No.6:21-cv-00540), alleging that Guardant used false and misleading claims to deceive physicians about the performance capabilities of its MRD test, in violation of the Lanham Act. Guardant's MRD test performance claims are incomplete or unsupported by clinical evidence, and can be misinterpreted by physicians and patients.