A Prospective, Randomized, Controlled Clinical Study on the Prevention of Chemotherapy Related Myelosuppression in Patients with Ewing's Sarcoma Using Trilaciclib

Vincristine (V), intravenous injection, 1.5 mg/m2 (maximum not exceeding 2mg), D1, odd cycle administration Doxorubicin (D), intravenous infusion, 75mg/m2, D1, odd cycle administration When the cumulative dose of doxorubicin is ≥ 375mg/m2, replace it with actinomycin D 1.25mg/m2 Cyclophosphamide (C), intravenous infusion, 1200mg/m2, D1, odd cycle administration Ifosfamide (I), intravenous infusion, 1800mg/m2, D1-5, even cycle administration Etoposide (E), intravenous infusion, 100mg/m2, D1-5, even cycle administration

Trilaciclib, intravenous infusion, 240 mg/m2, administered following chemotherapy (2 hours after completion of vincristine administration and within 4 hours before administration of other chemotherapy drugs)