Within one month after the start of chemotherapy, routine blood tests should be repeated once a week; in case of abnormality, the patient should be given “recombinant human granulocyte stimulating factor injection” for symptomatic treatment; thereafter, the frequency of blood tests may be reduced according to the situation. During the first month of chemotherapy, liver function should be rechecked once a week; if abnormal, liver-protective and enzyme-lowering treatment should be given; renal function should be rechecked once every 2 weeks; thereafter, the frequency of blood check may be reduced according to the situation. Medication regimen: vincristine once a week by IV; methotrexate tablets 5 days a week by mouth with 2 days of rest; must be vincristine input via central vein; treatment of oral ulcers during methotrexate administration: calcium folinic acid 3mg + 250ml sodium chloride (0.9%) with gargle and symptomatic treatment; oral hepatoprotective drugs (1-2 kinds) are recommended during treatment; diet: light, high protein, high If there is any side effect or any uncomfortable symptom such as fever, cold, cough, etc., discontinue the drug immediately and seek medical consultation at the hospital. This chemotherapy regimen should be continued for one year, and MRI should be reviewed after six months of chemotherapy.