Overview

The purpose of this study is to access the safety and efficacy of neoadjuvant Immunotherapy (Sintilimab, PD-1 inhibitor) combined with chemotherapy (S-1+Oxaliplatin) and radiotherapy for locally advanced esophagogastric junction adenocarcinoma.

Eligibility

Inclusion Criteria:

• Age 18-70, male and female.
• Histologically confirmed locally advanced esophagogastric junction Adenocarcinoma cT3-4aNxM0 (AJCC v8), Siewert typed as type II-III.
• No previous anti-tumor treatment.
• ECOG score was 0-1.
• Expected survival of ≥ 6 months
• Adequate organ reserve function.

Exclusion Criteria:

• Malignant disease other than gastric cancer (excluding radically treated basal cell carcinoma of the skin, squamous epithelial carcinoma of the skin, and/or radically resected carcinoma in situ) diagnosed within 5 years.
• Known Her-2 positive( IHC 3+ or FISH positve).
• Patients have received immunotherapy, such as PD-1 antibody, PD-L1 antibody and CTLA4 antibody
• Severe allergic reaction to monoclonal antibody.
• Receiving systemic glucocorticoid therapy within 7 days prior to the first dose of the study
• Known endoscopic signs of active bleeding from the lesion