Patients with initial diagnosis of gastric cancer (including gastroesophageal cancer) first need to determine the diagnosis, including pathology and staging, which is mainly based on gastroscopy and biopsy pathology, such as: hypofractionated adenocarcinoma of the gastric sinus, Lauren’s diffuse type, HER-2 2+, further improvement of staging tests include: enhanced CT of the chest, abdomen and pelvis, ultrasound of lymph nodes and related laboratory tests, through which the diagnosis can be clarified and thus If the tumor has metastasized to distant lymph nodes (including retroperitoneum, mediastinum, supraclavicular lymph nodes, etc.) or organs (liver, lung, etc.) or peritoneal and abdominal metastases (including peritoneal fluid), surgery is not suitable for this case, and patients need to consult internal medicine department for chemotherapy-based comprehensive treatment. More than half of the patients in China are diagnosed at a late stage and are not suitable for surgical resection.