The purpose of this study is to: 1. Compare treatment with chemotherapy (paclitaxel) alone to using a combination of nivolumab plus chemotherapy (paclitaxel) treatment in patients with angiosarcoma who have not been treated with paclitaxel chemotherapy alone. 2. Evaluate the effect of nivolumab in combination with cabozantinib on angiosarcoma (cancer) in patients who have either received paclitaxel or similar chemotherapy previously, or whose cancer has grown previously while getting paclitaxel chemotherapy on this study.
Testing the Addition of Nivolumab to chemotherapy in Treatment of Soft Tissue Sarcoma
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