A Dose Escalating Study of CD19/CD22/BCMA CAR-T Therapy in Relapsed or Refractory B Cell Non-Hodgkin Lymphoma(NHL)

"Subjects will undergo leukapheresis to isolate peripheral blood mononuclear cells (PBMCs) for the production of CD19/CD20/BCMA CAR T cells.~Cyclophosphamide and fludarabine will be given from day-5 to day-3 before the infusion for lymphodepletion. On day0 subjects will receive one dose treatment with CD19/CD20/BCMA CAR T cells by intravenous (IV) injection"