Perioperative Treatment of Combined Radiotherapy With SOX, Apatinib and Camrelizumab for Oesophagogastric Cancer

Inclusion Criteria: * Has previously untreated localized gastric or GEJ adenocarcinoma as defined by T3-4N+M0; * Plans to proceed to surgery following pre-operative chemotherapy. Has an Eastern Cooperative Oncology Group (ECOG) performance status score of 0 to 1. * Has adequate organ function. * Male participants of childbearing potential must agree to use an adequate method of contraception for the course of the study through 120 days after the last dose of therapy. * Female participants of childbearing potential must be willing to use an adequate method of contraception for the course of the study through 120 days after the last dose of therapy. * Has life expectancy of greater than 12 months. Exclusion Criteria: * Uncontrolled hypertension ( systolic ≥140 mmHg or diastolic ≥90 mmHg despite antihypertensive therapy) * Known hypersensitivity to any of the study drugs or excipients. * Known hereditary or acquired bleeding and thrombotic tendencies (e.g. hemophiliacs, coagulation disorders, thrombocytopenia, etc.); * Congenital or acquired immune deficiency (e.g. HIV infected)