Participants from group A (hematologic malignancies) will undergo leukapheresis followed by lymphodepletion and infusion of PRGN-3007. Lymphodepletion will include 3 days of treatment with fludarabine (30 mg/m^2) and cyclophosphamide (500 mg/m^2) prior to study day 0.
Participants will then receive PRGN-3007 in 3 dose levels beginning at Dose Level 1, using a standard 3+3 escalation design to determine Maximum Tolerated Dose (MTD). The target maximum doses infused at each dose level is:
Dose Level 1: 1×10^6 cells/kg Dose Level 2: 3×10^6 cells/kg Dose Level 3: 1×10^7 cells/kg
Fludarabine is an antimetabolite given prior to lymphodepletion.
Other Name: Fludara
Cyclophosphamide is a nitrogen mustard-derivative, polyfunctional alkylating agent given prior to lymphodepletion.
PRGN-3007 T cells are autologous T cells that are genetically modified ex vivo with the Sleeping Beauty (SB) system to express a ROR1-specific chimeric antigen receptor (ROR1 CAR), membrane bound interleukin-15 (mbIL15), a kill switch derived from truncated form of human epidermal growth factor receptor (HER1t) and include a built-in mechanism for intrinsic downregulation of programmed cell death receptor 1 (PD-1) expression on UltraCAR-T cells.The transgenes are delivered from a SB transposon which ensures co-expression all transgenes in all transfected cells. T cells are selected from the apheresis product and can be modified with the SB system to manufacture the T cells with the potential of infusing within 2 days from genetic modification.
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