Avelumab (anti–PD-L1) as first-line switch-maintenance or second-line therapy in patients with advanced gastric or gastroesophageal junction cancer: phase 1b results from the JAVELIN Solid Tumor trial ========================================================================================================================================================================================================== * Hyun Cheol Chung * Hendrik-Tobias Arkenau * Jeeyun Lee * Sun Young Rha * Do-Youn Oh * Lucjan Wyrwicz * Yoon-Koo Kang * Keun-Wook Lee * Jeffrey R. Infante * Sung Sook Lee * Margaret Kemeny * Ulrich Keilholz * Bohuslav Melichar * Alain Mita * Ruth Plummer * Denis Smith * Arnold B. Gelb * Huiling Xiong * Janet Hong * Vikram Chand * Howard Safran