RecruitingPhase 2Drug trialMetformin Hydrochloride in Combination With Standard of Care Systemic Therapy in Previously Untreated Advanced Unresectable or Metastatic Soft Tissue SarcomaThe purpose of this research study is to see how metformin, when used in combination with standard of care (SOC) treatment for metastatic (cancer that has spread) soft tissue sarcoma can improve patient outcomes.