Neoadjuvant Immunotherapy and Chemoradiotherapy for Locally Advanced Esophagogastric Junction Adenocarcinoma

"Patients will be given the perioperative treatment as below once recruited:~First, neoradiation (5w) will be given: intensity modulated radiotherapy was given for tumors and high-risk lymphatic drainage areas. PD-1 antibody will be started concurrent the radiation for 2 cycles.~The neochemotherapy (SOX) and PD-1 antibody will be given for 2 cycles after 1 week since radiation completed ; Patients will rest 2 weeks after the last cycle of neochemotherapy, and evaluation will be performed during this time. And D2 surgery will be performed if resectable.~SOX and PD-1 antibody will be given q3w. Adjuvant chemotherapy: We advise starting 4 cycles of SOX regimen in 3-8w after surgery."