RecruitingBiological interventionSafety and Efficacy Evaluation of 4th Generation Safety-engineered CAR T Cells Targeting SarcomasThe aim of this clinical trial is to assess the feasibility, safety and efficacy of CAR T cells immunotherapy in patients who have sarcoma that is relapsed or late staged. Another goal of the study is to assess the safety and efficacy of the therapy that combines CAR T cells and IgT cells to treat sarcoma.