Core Viewpoint - OS Therapies is progressing towards the submission of a rolling Biologics Licensing Application (BLA) for its OST-HER2 program targeting recurrent, fully resected, pulmonary metastatic osteosarcoma, following a productive End of Phase 2 meeting with the FDA [1][2][6] Group 1: FDA Meeting Outcomes - The FDA and OS Therapies reached alignment on several critical areas necessary for a successful BLA, including clinical trial efficacy endpoints and statistical analysis plans [2] - A public meeting with key osteosarcoma stakeholders is scheduled for October 10, 2025, to discuss advancing drug development for osteosarcoma [2] - The FDA is committed to working closely with the Company, prioritizing both formal and informal meetings, with the first informal meeting set for mid-September 2025 [2][6] Group 2: Clinical Data and Safety Profile - No significant safety concerns were identified for OST-HER2 based on the clinical data available to date, indicating an excellent safety profile [3] - The Company is preparing necessary data for submission to the FDA as part of the rolling BLA submission expected in Q4 2025 [3] Group 3: Designations and Financial Aspects - OST-HER2 has received Rare Pediatric Disease Designation (RPDD) and is eligible for a Prescription Drug User Fee Act (PDUFA) small business fee waiver, with a decision expected by the end of Q3 2025 [5][7] - The Company anticipates significant progress towards Breakthrough Therapy designation (BTD) and either Accelerated Approval or full approval during the upcoming FDA/OSI workshop [4] Group 4: Future Developments - OS Therapies is also advancing its next-generation Antibody Drug Conjugate (ADC) platform, known as tunable ADC (tADC), which utilizes proprietary technology for enhanced treatment delivery [8] - The Company is actively compiling data for the OST-400 natural history database to support the development of a synthetic control arm for future trials [2][6]