Core Viewpoint - OS Therapies Inc. has made significant progress in discussions with the FDA regarding the Phase 2b clinical trial of its lead product candidate, OST-HER2, for the treatment of recurrent pulmonary metastatic osteosarcoma, with plans to submit a Biologics Licensing Application (BLA) by the end of January 2026 [1][2][7]. Company Overview - OS Therapies is a clinical-stage oncology company focused on developing treatments for osteosarcoma and other solid tumors, leading in listeria-based cancer immunotherapies [4]. - OST-HER2 is an innovative immunotherapy that utilizes a bioengineered form of Listeria monocytogenes to elicit a strong immune response against cancer cells expressing HER2 [2][4]. FDA Meeting Highlights - The FDA confirmed that data from single-arm studies in ultra-rare pediatric cancer osteosarcoma could support a BLA under the Accelerated Approval Program [7][8]. - The FDA suggested a confirmatory study design that includes additional osteosarcoma disease settings, such as the prevention of recurrence following primary tumor resection [7][8]. - The FDA indicated that the use of canine data to support the correlation between immune biomarker activation and clinical benefit will depend on the chosen biomarkers and their clinical validation [7][8]. Upcoming Milestones - The company expects to complete the immune activation biomarker analysis soon, with data to be released during the JP Morgan Healthcare Conference in January 2026 [2][3]. - Following the BLA submission, the company plans to hold additional meetings with the FDA to review biomarker data and confirmatory study design [2][3][7].