OS Therapies Provides Clinical & Global Regulatory Updates

Core Insights - OS Therapies is making significant progress in its clinical-stage oncology programs, particularly with the OST-HER2 immunotherapy for recurrent, pulmonary metastatic osteosarcoma, with an End of Phase 2 Meeting scheduled with the FDA on August 27, 2025 [2][7] - The company has confirmed a Scientific Advice Meeting with the European Medicines Agency regarding the OST-HER2 program, which is a critical step for obtaining a centralized marketing authorization in Europe [3][7] - All patients in the Phase 1 clinical study of OST-504 have completed treatment, with updated clinical data expected in the second half of 2025 [4][7] Regulatory Updates - The FDA has granted an End of Phase 2 Meeting to review clinical data for OST-HER2, with the company aiming to align with the FDA for a rolling review Biologics Licensing Application under the Accelerated Approval Program [2][7] - A Scientific Advice Meeting with the EMA is confirmed, which is essential for the Centralized Procedure for marketing authorization across European Member States [3] - The company plans to pursue a Conditional Marketing Authorization in the UK through the MHRA's Innovative Licensing and Access Pathway, contingent on a successful meeting on July 31, 2025 [3] Clinical Development - The OST-HER2 program utilizes a HER2-bioengineered form of Listeria monocytogenes to stimulate an immune response against HER2-expressing cancer cells [5] - The company has completed a Phase 1 clinical study of OST-504, a prostate cancer-specific immunotherapy, with data expected to be reported later in 2025 [4][8] - OST-HER2 has received various designations from regulatory bodies, including Rare Pediatric Disease Designation and Fast-Track designation from the FDA [9] Strategic Focus - The company aims to obtain regulatory approval for OST-HER2 before the expiration of the rare pediatric disease priority review voucher program, which could provide significant non-dilutive funding [5] - OS Therapies intends to focus capital on the OST-HER2 approval while advancing other clinical programs without significant capital deployment [5] - The company is also advancing its next-generation Antibody Drug Conjugate platform, known as tunable ADC, which features tailored antibody-linker-payload candidates [10]