- Patients with pathologically proven diagnosis of grade 2-3 (intermediate or high grade) soft tissue sarcoma with size >= 5 cm are eligible to enroll if the intention to treat is curative; they must have sufficient tissue to submit to central laboratory for review as well as for NGS sequencing (see submission requirement); availability of tumor tissue is mandatory for study eligibility; the patient must have consented to provide archived formalin-fixed paraffin-embedded tumor tissue for future central pathology review, NGS sequencing and/or translational research