RecruitingPhase 1Biological interventionSafety and Efficacy of DIT309 in Advanced Bone and Soft Tissue SarcomasThis is a open-Label, dose-escalation study to evaluate the safety, tolerability and antitumor activity of DIT309 in subjects with advanced bone and soft tissue sarcomas.The study also plan to explore the Maximum Tolerated Dose (MTD) and determine the Recommended Phase II Dose (RP2D) of the CAR-T cell therapy.