Conclusions
Overall, MASCT-I plus camrelizumab and apatinib had acceptable safety profile and promising efficacy in patients with unresectable recurrent or metastatic bone and soft-tissue sarcoma. After comprehensive consideration of efficacy and safety, schedule-II administration method was recommended. Our study displayed more favorable clinical outcomes than non-parallel historical control studies of apatinib alone or apatinib plus camrelizumab.