Highly malignant tumors indicate that the tumor is highly malignant, the tumor cells grow rapidly, and metastasis of regional lymph nodes and distant metastasis can easily occur. The prognosis of this kind of malignant tumor is not good compared with moderate and low malignant tumors, which are often found to be in the middle and late stages of tumor and have lost the chance of surgical resection. Even if surgery is performed, the chances of recurrence and metastasis after surgery are high, so adjuvant radiotherapy or chemotherapy is often required after surgery. Even if the tumor is still in early stage when discovered, it cannot be ruled out that there are tiny metastases that have already metastasized to other parts of the body, just that they are not found through current ultrasound or CT examination, so adjuvant chemotherapy is needed after early surgery.