New Post-Hoc Analysis Shows Patients Whose Clinicians Had Access to GeneSight Results for Depression Treatment Are More Likely to Feel Better Sooner

SALT LAKE CITY, Oct. 31, 2025 (GLOBE NEWSWIRE) -- Myriad Genetics, Inc., (NASDAQ: MYGN), a leader in molecular diagnostic testing and precision medicine, today announced a post-hoc analysis of the Precision Medicine in Mental Health Care (PRIME) study showed that treatment informed by the GeneSight® test led to faster initial remission and response in patients with Major Depressive Disorder (MDD). Further, the post-hoc analysis showed that this benefit persisted over six months with no evidence of changing over time. “Every single day matters to someone suffering from depression; patients want to get back to feeling like themselves as quickly as possible. As a result, a long trial-and-error period with medication can be frustrating for both clinicians and patients,” said Dale Muzzey, chief scientific officer, Myriad Genetics. “This post-hoc analysis shows that treatment informed by the GeneSight test led to faster remission and response in patients with MDD – and this benefit lasted for at least six months.” The PRIME Care study, the largest pharmacogenomic randomized controlled trial in mental health, enrolled 1,944 U.S. Veterans with depression to test whether GeneSight results improved treatment outcomes. Published in the Journal of the American Medical Association (JAMA) in 2022, it found patients whose clinicians had GeneSight results were significantly more likely to achieve remission over 24 weeks. The post-hoc analysis of the study results explored whether having access to the GeneSight test results increased the rate of remission and response over time and if the effect was persistent. Published in the Oct. 30, 2025 edition of Frontiers in Pharmacology, the new post-hoc analysis showed that patients who took the GeneSight test were at any given time during the 24-week study period relative to patients receiving usual care: 27% more likely to achieve remission from depression21% more likely to experience response (at least a 50% reduction in depressive symptoms) Myriad Genetics plans to submit these data to payers as part of its ongoing efforts to increase patient access to the GeneSight test and to help patients achieve remission from depression. About the PRIME Care Study & the post-hoc analysisThe largest pharmacogenomic (PGx) randomized controlled trial (RCT) ever conducted in mental health, the PRIME Care Study included 1,944 veteran patients with MDD who were randomized to receive GeneSight results immediately (pharmacogenomic-guided group) or after 24 weeks (usual care group). The U.S. Department of Veterans Affairs (VA) independently conducted and funded the study. Myriad Genetics provided the GeneSight tests for the study. PRIME Care met both of its prespecified primary outcomes: patients in the PGx-guided arm were less likely to be prescribed an antidepressant medication with a significant gene-drug interaction and were 28% more likely to achieve remission across the 24-week duration of the trial compared to patients in the usual care arm. The prespecified post-hoc analysis of the PRIME Care study included veteran patients who had sufficient data to be included in the post-hoc analysis, or 1,764 of the 1,944 veterans. The primary endpoints of this post-hoc analysis were the time of the first instance of remission (defined as PHQ-9 ≤5) and response (defined as ≥50% reduction from baseline PHQ-9 score). About the GeneSight® TestThe GeneSight Psychotropic test from Myriad Genetics is the category-leading pharmacogenomic test for more than 60 medications commonly prescribed for depression, anxiety, ADHD, and other psychiatric conditions. The GeneSight test can help inform clinicians about how a patient’s genes may impact how they metabolize and/or respond to certain psychiatric medications. It is designed to provide information that may help reduce the trial-and-error process that often takes place when patients are prescribed certain mental health medications. Learn more at www.genesight.com. About Myriad Genetics Myriad Genetics is a leading molecular diagnostic testing and precision medicine company dedicated to advancing health and well-being for all. Myriad Genetics develops and offers molecular tests that help assess the risk of developing disease or disease progression and guide treatment decisions across medical specialties where molecular insights can significantly improve patient care and lower healthcare costs. For more information, visit www.myriad.com. Safe Harbor Statement This press release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, including statements regarding the company’s plans to submit this data to payers as part of its ongoing efforts to increase patient access to the GeneSight test and to help patients achieve remission from depression. These “forward-looking statements” are management’s expectations of future events as of the date hereof and are subject to known and unknown risks and uncertainties that could cause actual results, conditions, and events to differ materially and adversely from those anticipated. Such factors include those risks described in the company’s filings with the U.S. Securities and Exchange Commission, including the company’s Annual Report on Form 10-K filed on February 28, 2025, as well as any updates to those risk factors filed from time to time in the company’s Quarterly Reports on Form 10-Q or Current Reports on Form 8-K. Myriad is not under any obligation, and it expressly disclaims any obligation, to update or alter any forward-looking statements, whether as a result of new information, future events or otherwise except as required by law. Investor Contact Matt Scalo (801) 584-3532 IR@myriad.com Media Contact Kate Schraml(224) 875-4493PR@myriad.com

New Post-Hoc Analysis Shows Patients Whose Clinicians Had Access to GeneSight Results for Depression Treatment Are More Likely to Feel Better Sooner

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