1. Surgical treatment: The most effective treatment for gastric cancer is surgical resection, and radical surgery should be performed as early as possible. The surgical plan is determined based on the preoperative and intraoperative assessment of tumor location, depth of infiltration, and degree of lymph node metastasis. For stage III and IV patients who cannot undergo curative surgery, palliative surgery may be considered, such as subtotal palliative gastrectomy or gastrointestinal fistula and other palliative bypass surgeries.