Comparison of MAPI+Camrelizumab Versus API+Apatinib Versus MAPI in Patients With a Poor Response to Preoperative Chemotherapy for Newly Diagnosed High-grade Osteosarcoma

Comparison of MAPI+Camrelizumab Versus API+Apatinib Versus MAPI in Patients With a Poor Response to Preoperative Chemotherapy for Newly Diagnosed High-grade Osteosarcoma