Additional Study Information: The experimental drug called INBRX 109 has been developed as a treatment for unresectable or metastatic conventional chondrosarcoma. The purpose of this study is to learn about the effects of the study drug, INBRX-109 on you, your immune system, and your cancer. This study is being done to understand if INBRX-109 is effective against your chondrosarcoma and how safe this drug is. INBRX-109 was specifically created for the treatment of cancer. It works in a similar way as antibodies, which are proteins that are naturally present in the body. Antibodies help the body's immune system fight diseases such as infections. INBRX-109 works by causing specific cell sensors to initiate the death of cancer cells. This is different from the ways other cancer therapies work.