Malignant tumors of the stomach include gastric cancer, malignant lymphoma, and malignant mesenchymal tumor, etc. Gastric cancer is the most common, and gastric cancer can be divided into adenocarcinoma, squamous carcinoma, adenosquamous carcinoma, and carcinoid carcinoma, etc. Adenocarcinoma accounts for the most of the gastrointestinal malignancies. It is important to clearly diagnose and stage malignant tumors, and early treatment should be active, mainly radical surgery, symptomatic treatment, and regular postoperative adjuvant treatment to prevent recurrence and metastasis; for patients who cannot be operated, multidisciplinary joint treatment, such as radiotherapy, targeted therapy, immunotherapy, etc., is required to improve the quality of survival and prolong the survival period. Adenocarcinoma is one of the malignant tumors of the salivary gland epithelium with a higher malignancy level. The individual differences in survival are large and also related to the type of treatment, norms, and their own efficacy, and there is no definite period for the specific time.