Chemotherapy, also commonly known as chemotherapy, is very common in tumor treatment. Generally, chemotherapy is mainly applied to advanced tumors that cannot be operated, and can be done as palliative chemotherapy. In addition, there are some post-operative adjuvant chemotherapy for patients after surgery, which is aimed at preventing recurrence and metastasis. In addition, there are some patients who are temporarily inoperable. But there is a hope of surgery, at this time, preoperative neoadjuvant chemotherapy can be done first, which can shrink the tumor and reduce the stage, and then there is a chance of surgery for radical treatment. Of course, before chemotherapy, routine blood and liver and kidney function tests should be done to exclude contraindications to chemotherapy before chemotherapy. If there is more white blood cell drop, heavy anemia or poor liver and kidney function, chemotherapy is also not allowed.