Patients without cancerous thrombus in the vasculature are less likely to metastasize and recur than patients with cancerous thrombus in the vasculature, but it does not exclude that metastasis will not occur. The presence of a thrombus in the vasculature indicates that the tumor cells have invaded the surrounding blood vessels and lymphatic vessels, which is a high risk factor for recurrence and metastasis. Vascular cancer embolism is a factor to be considered whether it is needed after surgery, but whether the tumor will metastasize or not is not determined by the item of vascular cancer embolism. If the tumor is already large when found, the pathological type is hypodifferentiated or undifferentiated, the regional lymph nodes have already metastasized, and there is local nerve invasion, if these factors are present, the chances of recurrence and metastasis are high.