Core Viewpoint - OS Therapies has announced positive data for its treatment OST-HER2 in dogs with unresected osteosarcoma, indicating potential for use as a frontline therapy in humans, aiming to prevent or delay limb amputation and reduce the need for chemotherapy [2][4][8] Group 1: Treatment Efficacy - OST-HER2 combined with palliative radiation showed clinical and radiographic arrest of primary tumors in dogs, leading to prolonged time to metastasis without surgery or chemotherapy [2][4] - The treatment demonstrated a significant improvement in overall survival, with 5 out of 15 dogs surviving over 500 days [6] - Positive data published in "Molecular Therapy" correlates immune responses to OST-HER2 with prevention of metastasis and long-term survival benefits [3][6] Group 2: Safety and Tolerability - Treatment with OST-HER2 was found to be safe and well tolerated in both studies conducted [4][6] Group 3: Future Plans and Approvals - The company plans to submit data to the USDA for conditional approval of the new manufacturing process for OST-HER2, aiming for sales to begin in 2025 [7] - A pivotal clinical study is planned to gain full approval by 2026 [7] - The company is focused on obtaining Accelerated Approval for OST-HER2 in recurrent, fully resected, lung metastatic human osteosarcoma by the end of 2025 [8] Group 4: Company Background - OS Therapies is a clinical-stage oncology company specializing in treatments for osteosarcoma and other solid tumors, with OST-HER2 as its lead asset [9] - The company has received various designations from the FDA, including Rare Pediatric Disease Designation and Fast-Track status [9] - OST-HER2 has shown statistically significant benefits in previous clinical trials for lung metastatic osteosarcoma [9]

Company Overview - ADC Therapeutics SA is a commercial-stage global leader in the field of antibody drug conjugates (ADCs) [3] - The company is focused on transforming treatment paradigms for patients with hematologic malignancies and solid tumors [3] Recent Developments - CEO Ameet Mallik will present a company overview at the 24th Annual Needham Virtual Healthcare Conference on April 8, 2025, at 8:00 a.m. ET [1] - A live webcast of the presentation will be available on the company's website, with a replay accessible for approximately 30 days [2] Product Pipeline - ADC Therapeutics' CD19-directed ADC ZYNLONTA (loncastuximab tesirine-lpyl) has received accelerated approval from the FDA and conditional approval from the European Commission for treating relapsed or refractory diffuse large B-cell lymphoma after two or more lines of systemic therapy [4] - ZYNLONTA is also being developed in combination with other agents and in earlier lines of therapy [4] - The company has multiple ADCs in ongoing clinical and preclinical development [4] Company Operations - ADC Therapeutics is headquartered in Lausanne, Switzerland, with operations in London, the San Francisco Bay Area, and New Jersey [5]

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