RecruitingPhase 1Drug trialAutologous B7-H3 Chimeric Antigen Receptor T Cells in Relapsed/Refractory Solid TumorsThe purpose of this study is to test the manufacturing feasibility and safety of intravenous (IV) administration of B7-H3CART in children and young adult subjects with relapsed and/or refractory solid tumors expressing B7-H3 target using a standard 3+3 dose escalation design.