Chemotherapy followed by surgery is clinically known as neoadjuvant chemotherapy, which has the benefit of converting some cancer patients who cannot be completely removed surgically into patients who can be completely removed, improving the treatment effect and cure rate. Some cancer patients do not have distant metastasis and have the chance of radical surgery to completely remove the mass, but due to the large size of the mass or the mass is close to or invades important organs such as large blood vessels of the heart and large nerves, the surgery cannot completely remove the mass cleanly, resulting in the patient losing the chance of radical cancer cure. In this case, several courses of chemotherapy can be given before surgery, and if the chemotherapy is effective, the mass can shrink significantly. When the mass shrinks to the extent that it can be completely removed, then radical surgery can be performed, and the patient will have a chance to be cured, thus improving the treatment effect and cure rate.