The formation of metastasis means that the malignant tumor has reached an advanced stage, and the treatment is mainly based on chemotherapy, supplemented by other treatment options such as surgery, radiotherapy, targeted therapy or immunotherapy, and the aim is no longer to cure, but to control the growth of the tumor and improve the quality of life of the patient as the ultimate goal. Due to the formation of metastases, patients lose the chance of surgical resection for radical cure, chemotherapy becomes the first choice, but some patients cannot tolerate chemotherapy due to their poor health condition, they can choose oral targeted therapy or immunotherapy, which has little side effects and good effect. Of course, surgery or radiotherapy is not completely unavailable for patients with metastases. When patients have emergencies, for example, when they have life-threatening symptoms such as breathing difficulties and inability to eat due to large tumors that compress important organs such as the trachea and esophagus, palliative surgery or radiotherapy can provide rapid relief.