A Prospective, Single-arm, Multicenter Exploratory Clinical Study of Anlotinib Combined With Bempegaldesleukin and Conventional Chemoradiotherapy for the Treatment of Unresectable Locally Advanced or Metastatic Soft Tissue Sarcoma.

"Subjects will receive concurrent anlotinib, bempegaldesleukin, and radiotherapy, followed by maintenance therapy with anlotinib, bempegaldesleukin, and chemotherapy.~Concurrent Radiotherapy Phase:~Anlotinib: 10 mg orally once daily on days 1-14, every 3 weeks (q3w), for 2 cycles during radiotherapy.~Bempegaldesleukin: 1200 mg IV on day 1, q3w, for 2 cycles during radiotherapy. Radiotherapy: Delivered once daily, with a total biological effective dose (BED) of 36-100 Gy. Techniques may include conventional fractionation or stereotactic body radiotherapy (SBRT), as determined by the investigator.~Maintenance Phase:~Chemotherapy: Doxorubicin 40 mg/m² IV day 1 + ifosfamide 1.2-2.4 g/m² IV days 1-5 per 21-day cycle for 4-6 cycles.~Anlotinib: 10 mg orally once daily on days 1-14, q3w. Bempegaldesleukin: 1200 mg IV on day 1, q3w."