There is no exact time when it is best to take a leukapheresis injection, because different patients, the specific severity of the disease is different, and there are differences in myelosuppressive reaction after chemotherapy, so it is necessary to judge according to the specific situation, generally can be 24~48 hours after chemotherapy leukapheresis injection. Leukocyte boosting injection refers to recombinant human granulocyte colony-stimulating factor, which can be used to raise granulocytes and prevent severe myelosuppressive reactions, and is suitable for patients with granulocytopenia. Usually, the number of white blood cells in a patient’s body will be relatively reduced in the 24~48 hours after chemotherapy, so the white blood cell boosting injection can be given in this period of time. However, this is not absolute and still depends on the patient’s individual situation. If the patient has not yet reached the state of granulocyte deficiency, and only a mild myelosuppressive reaction has occurred, then it means that the risk of secondary serious infections is relatively low, and the leukocyte boosting injection can be dispensed with for the time being. However, if the patient’s granulocytopenia has reached the state of granulocyte deficiency and the white blood cells are lower than 2.5, then it means that the problem of secondary serious infection is likely to occur, and then the white blood cells should be injected in time. During the treatment period, patients should maintain a relaxed mood, timely supplementation, eat more fresh vegetables and fruits, and pay attention to rest, avoid overwork.