Interventions: Biological: Atezolizumab; Procedure: Biospecimen Collection; Drug: Capecitabine; Procedure: Computed Tomography; Drug: Docetaxel; Procedure: Echocardiography; Drug: Fluorouracil; Drug: Leucovorin Calcium; Procedure: Lymphadenectomy; Procedure: Magnetic Resonance Imaging; Drug: Oxaliplatin; Procedure: Positron Emission Tomography; Procedure: Surgical Procedure
Sponsors: National Cancer Institute (NCI)
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