The chemotherapeutic drugs for thymoma include doxorubicin, paclitaxel, isocyclophosphamide and so on. 1. Doxorubicin: it is a kind of anti-tumor antibiotic, which can inhibit the synthesis of RNA and DNA, and has the strongest inhibition effect on RNA. It has a wide anti-tumor spectrum, and has effect on many kinds of tumors, and is a non-specific drug of cycle, which has the effect of killing all kinds of tumor cells of growth cycle. 2. Paclitaxel: it is an active ingredient extracted from the bark of the red cedar tree. Its mechanism of action is to stabilize and enhance the polymerization of microtubule proteins and prevent the depolymerization of microtubules, thus inhibiting the mitosis of cells and achieving the antitumor effect. 3. Isocyclophosphamide: Its mechanism of action is to inhibit DNA synthesis and interfere with RNA synthesis. Heterocyclic phosphoramidon does not have anticancer activity in vitro, and will be hydrolyzed by phosphoramidase or phosphatase in liver or tumor to phosphoramidon nitrogen mustard with activation, thus playing antitumor effect. Bone marrow suppression, alopecia, nausea and vomiting, hematuria, oliguria and other adverse reactions may occur after the use of chemotherapeutic drugs. It is forbidden for people with liver and kidney dysfunction, the elderly, children, pregnant women, lactating women, and people who are allergic to the above components of the drug. The drug should be used under the guidance of a doctor to avoid delays.