OS Therapies LLC, the developer of a listeria-based cancer vaccine to prevent metastasis and increase overall survival in young people with osteosarcoma, has closed on a $6 million series A financing led by Noble Capital Markets and Tichenor Ventures. The funds will help the company advance its lead candidate, OST-HER2, into a phase IIb trial this year with hopes of a potential FDA filing by in 2022.