In recent years, there has been a very rapid development of anti-tumor drugs, chemotherapy drugs are not only more effective, but also less side effects. Most patients have mild side effects of chemotherapy and can tolerate it well, and in most cases do not experience obvious symptoms such as vomiting. Only a small number of patients need to adjust their medication due to individual reasons. A very small number of patients are particularly sensitive to certain specific chemotherapeutic agents and may experience more serious adverse reactions. (Under the regular use of drugs, the patient’s “genetic differences” determine the degree of sensitivity to the “side effects of chemotherapy”, it is the “genes” that lead to individual differences in response, and there is no effective means of predicting the patient’s response to chemotherapy. There is no effective means of predicting the magnitude of a patient’s response to chemotherapy).