Testing the Addition of Nivolumab to Chemotherapy in Treatment of Soft Tissue Sarcoma

PRIMARY OBJECTIVES: I. To determine the progression free survival (PFS) for paclitaxel with and without nivolumab in subjects with taxane naive angiosarcoma. II. To determine the overall response rate (ORR) of nivolumab in combination with cabozantinib S-malate (cabozantinib) in patients with taxane pre-treated angiosarcoma. SECONDARY OBJECTIVES: I. To determine the ORR of paclitaxel in combination with nivolumab. II. To determine clinical activity of the addition of nivolumab to paclitaxel or cabozantinib in subjects with angiosarcoma by determination of overall survival (OS) for each combination. III. To determine clinical activity of the addition of nivolumab to cabozantinib in subjects with taxane pre-treated angiosarcoma by determination of progression free survival (PFS) at 6 months by Response Evaluation Criteria in Solid Tumors (RECIST) version (v)1.1 criteria. IV. To assess toxicity of the concurrent nivolumab-paclitaxel and nivolumab-cabozantinib combinations in subjects with angiosarcoma based on National Cancer Institute (NCI)-Common Terminology Criteria for Adverse Events (CTCAE) v.5.0. V. To measure symptomatic adverse events (AE) for patients via Patient Reported Outcome (PRO)-CTCAE, Functional Assessment of Cancer Therapy General (FACT-G) questionnaire, and Linear Analogue Self-Assessment (LASA). OUTLINE: Patients who have not previously received a taxane are randomized to Arm I or Arm II. Patients who have previously received a taxane are assigned to Arm III. ARM I: Patients receive nivolumab intravenously (IV) over 30 minutes on day 1 and paclitaxel IV over 1 hour on days 1, 8, and 15. Cycles repeat every 4 weeks for up to 2 years (24 months) for patients who achieve complete response (CR), partial response (PR) or stable disease (SD) on immunotherapy/nivolumab, or in the absence of disease progression or unacceptable toxicity. ARM II: Patients receive paclitaxel IV over 1 hour on days 1, 8, and 15. Cycles repeat every 4 weeks for up to 2 years in the absence of disease progression or unacceptable toxicity. Patients with disease progression may crossover to Arm III. ARM III (EFFECTIVE OF 10/28/2021, NEW PATIENT ACCRUAL PERMANENTLY CLOSED): Patients receive nivolumab IV over 30 minutes on day 1 and cabozantinib orally (PO) daily. Cycles repeat every 4 weeks for up to 2 years (24 months) for patients who achieve CR, PR or SD on immunotherapy/nivolumab, or in the absence of disease progression or unacceptable toxicity. Patients also undergo collection of blood at baseline and on study, computed tomography (CT) scan, spiral CT, or magnetic resonance imaging (MRI), or FDG-positron emission tomography (FDG-PET) scan throughout the trial. After completion of study treatment, patients are followed up every 3 months for 3 years.