Chemotherapy, also known as chemotherapy, plays a very important role in the comprehensive treatment of tumors. The drugs used in chemotherapy need to be decided according to the type and stage of tumor, there are intravenous chemotherapy drugs and oral chemotherapy drugs. If the first-line regimen is not effective, the second-line regimen can be used instead. For example, the first-line regimen for breast cancer mainly includes adriamycin, cyclophosphamide, paclitaxel, fluorouracil, etc. If the first-line regimen is resistant or the disease progresses, the second-line regimen, such as gemcitabine, can be chosen. In addition, there are oral drugs for chemotherapy, such as Tegeo and Capecitabine for gastrointestinal malignancies, and of course, Capecitabine can also be used for breast cancer treatment. Generally, chemotherapy should be accompanied by monitoring the changes of blood routine, which may cause bone marrow suppression and other reactions and need to be treated symptomatically.