Testing the Addition of an Individualized Vaccine to Durvalumab and Tremelimumab and Chemotherapy in Patients With Metastatic Triple Negative Breast Cancer

PRIMARY OBJECTIVE: I. Evaluate the clinical response to nab-paclitaxel + durvalumab (MEDI4736) + tremelimumab + neoantigen vaccine (Arm 1) versus (vs.) nab-paclitaxel + durvalumab (MEDI4736) + tremelimumab (Arm 2) in patients with metastatic triple negative breast cancer (TNBC). SECONDARY OBJECTIVE: I. Evaluate the safety of nab-paclitaxel + durvalumab (MEDI4736) + tremelimumab + neoantigen vaccine vs. nab-paclitaxel + durvalumab (MEDI4736) + tremelimumab in patients with metastatic TNBC. EXPLORATORY OBJECTIVES: I. Assess the immune response induced by nab-paclitaxel + durvalumab (MEDI4736) + tremelimumab + neoantigen vaccine vs. nab-paclitaxel + durvalumab (MEDI4736) + tremelimumab in patients with metastatic TNBC. II. Biomarkers of response to therapy will be assessed based on the research biopsies performed at baseline, following the chemotherapy run-in (Part A) and following nab-paclitaxel + durvalumab (MEDI4736) + tremelimumab +/- neoantigen vaccine (Part B). OUTLINE: PART A: Patients receive gemcitabine hydrochloride intravenously (IV) over 30 minutes and carboplatin IV over 30 minutes on days 1 and 8 of each cycle. Treatment repeats every 21 days for up to 18 weeks (6 cycles) in the absence of disease progression or unacceptable toxicity. Patients who experience progression of disease or who are intolerant of treatment may switch and receive nab-paclitaxel IV over 30 minutes on days 1, 8, and 15 of each remaining cycle or sacituzumab govitecan-hziy IV over 1-3 hours on days 1 and 8 of each remaining cycle. Treatment with nab-paclitaxel repeats every 28 days for up to 2 cycles (for patients with progressive disease) or until a total of 18 weeks of treatment have been completed (for patients who are intolerant of treatment) at the discretion of the treating physician. Treatment with sacituzumab govitecan-hziyl repeats every 21 days for up to 2 cycles (for patients with progressive disease) or until a total of 18 weeks of treatment have been completed (for patients who are intolerant of treatment) at the discretion of the treating physician. PART B: Patients are randomized to 1 of 2 arms. ARM I: Patients receive personalized synthetic long peptide vaccine and poly-ICLC subcutaneously (SC) on days 1, 4, 8, 15, 22, 50, and 78 in the absence of disease progression or unacceptable toxicity. Patients also receive tremelimumab IV over 60 minutes on day 1 of cycles 1-4, durvalumab IV over 60 minutes on day 1 of each cycle and nab-paclitaxel IV over 30 minutes on days 1, 8, and 15 of each cycle. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. ARM II: Patients receive tremelimumab IV over 60 minutes on day 1 of cycles 1-4, durvalumab IV over 60 minutes on day 1 of each cycle and nab-paclitaxel IV over 30 minutes on days 1, 8, and 15 of each cycle. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. Patients undergo tumor biopsy, blood and urine sample collection, computed tomography (CT) scan and magnetic resonance imaging (MRI) on study. After completion of study treatment, patients are followed up every 3 months for 1 year, then annually thereafter.