Combination of Targeted and Immunotherapy for Advanced Biliary Tract and Esophagogastric Gastric Cancer

Patient will receive DKN-01 300 mg IV every 2 weeks

Patient will receive Atezolizumab 840 mg IV every 2 weeks until PD

Patient will receive Paclitaxel 80 mg/m2 IV on day 1, 8 and 15 of a 28 day cycle until PD