Envafolimab

Given that osteosarcoma typically presents at an early age and predominantly affects pediatric and adolescent populations, early control of disease progression and the opportunity for complete tumor resection are particularly crucial. Postoperatively, patients can regain functional mobility through prosthetic implantation and artificial joint reconstruction, thereby preventing premature loss of mobility in young patients. This study aims to explore the efficacy and safety of neoadjuvant treatment with the PD-L1 antibody envafolimab in combination with standard chemotherapy in patients with resectable stage IIb osteosarcoma, and to assess whether this combined regimen can increase the proportion of patients achieving complete tumor resection.

Patients diagnosed with locally advanced nasopharyngeal carcinoma will be recruited in this study. All the patients will get 3 cycles of GP+ Envafolimab for the induction chemotherapy. After that, the patients will receive concurrent chemoradiotherapy. Radiotherapy will be given by IMRT, under the dose of GTVnx 68-70Gy/30-33f, 5d/w,6-7w, during which, every patient would receive 2 cycles of DDP+Envafolimab as concurrent chemotherapy. Then patients would receive Envafolimab every 3 weeks for maintenance treatment for a year, until disease progression or intolerance of treatment. . We aim to evaluate the three years progression free survival of these patients by the combination of Envafolimab with curative chemoradiotherapy.