-- Initial positive data from Phase 1/2 clinical trial of PM359 in CGD provide clinical proof-of-concept for Prime Editing as a transformative gene editing technology --

-- On-track to file IND and/or CTA for Wilson's Disease and AATD programs in 1H 2026 and mid-2026, respectively; initial clinical data for both expected in 2027 --

-- Allan Reine, M.D., CFO, to succeed Keith Gottesdiener, M.D., as CEO; Jeff Marrazzo, member of the Board of Directors, named Executive Chair --

-- Implementing cost cutting measures to significantly reduce cash needs in advance of key data inflection points --

CAMBRIDGE, Mass., May 19, 2025 (GLOBE NEWSWIRE) -- Prime Medicine, Inc. (NASDAQ:PRME), a biotechnology company committed to delivering a new class of differentiated one-time curative genetic therapies, today announced a strategic restructuring, including the deprioritization of its Chronic Granulomatous Disease (CGD) programs, as well as a cost and workforce reduction to focus on its liver franchise and programs funded through external partnerships.

Prime Medicine is currently advancing in vivo programs to cure two of the largest genetic liver diseases, Wilson's Disease and Alpha-1 Antitrypsin Deficiency (AATD), with initial clinical data from both programs expected in 2027. Prime Medicine will also continue its in vivo Cystic Fibrosis program with support from the Cystic Fibrosis Foundation, and its efforts to develop Prime Edited CAR-T products for hematology, immunology and oncology in partnership with Bristol Myers Squibb. In addition, Prime Medicine will continue to pursue additional business development opportunities to accelerate innovation, ensure the broadest application of Prime Editing, and further bolster its financial resources.

Also today, Prime Medicine announced that Keith Gottesdiener, M.D., has decided to step down as Chief Executive Officer (CEO) and a member of the Company's Board of Directors, effective immediately. Allan Reine, M.D., Prime Medicine's Chief Financial Officer (CFO), has been named CEO and member of the Board of Directors and Jeff Marrazzo, member of the Company's Board of Directors, has been named Executive Chair.