Clinical observation of local intervention combined with camrelizumab and apatinib in the treatment of metastatic soft-tissue sarcoma

The study aimed to investigate the effectiveness and safety of the combination of immune checkpoint inhibitor, local interventional therapy, and anti-angiogenic therapy in patients with metastatic soft-tissue sarcoma (mSTS).We retrospectively evaluated the medical records of patients with mSTS who started treatment between September 2018 and June 2020 at our hospital.Overall, 33 patients with different subtypes of mSTS were included. Most primary tumors originated from the lungs, and the rest were scattered throughout the body. All patients were treated with camrelizumab combined with apatinib within 5 days of local interventional therapy using transarterial chemoembolization (TACE) or radiofrequency ablation (RFA). Primary end point was progression-free survival (PFS), and secondary end points were objective response rate (ORR), disease control rate (DCR), and patient safety.The median PFS, median overall survival (OS), ORR, and DCR were 8.8 months, 18.5 months, 36.4%, and 75.8%, respectively. Patients (n = 20) treated with RFA combined with TACE showed better responses than those treated with RFA alone (n = 13), with mPFS of 9.3 and 7.9 months (P = 0.044) and mOS of 19.0 and 16.2 months (P = 0.043), respectively. Patients (n = 8) with alveolar soft part sarcomas showed excellent efficacy, with ORR, DCR, mPFS, and mOS of 62.5%, 87.5%, 11.5 months, and 22.5 months, respectively. Grades 3 or 4 treatment-related adverse events occurred in 12 of 33 patients.Local intervention therapy combined with camrelizumab and apatinib is effective and safe for patients with mSTS and should be investigated in future clinical trials.