Stage II Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8 | Stage III Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8 | Stage IIIA Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8 | Stage IIIB Soft Tissue Sarcoma of the Trunk and Extremities AJCC v8