This is a single arm study to evaluate the safety and efficacy of CAR19BCMA CAR-T cells in the treatment of relapsed/refractory CD19/BCMA positive plasma cell neoplasms and lymphomas/leukemias with plasmacytic differentiation.
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According to the incidence of treatment-related adverse events (AEs) to evaluate the safetyof CAR19BCMA CAR-T cells in the treatment of relapsed/refractory CD19+BCMA+plasma cell neoplasms and lymphomas/leukemias with plasmacytic differentiation.
Timeframe: up to 3 years
According to the determine the Maximal Tolerable Dose(MTD) to evaluate the safety of CAR19BCMA CAR-T cells in the treatment of relapsed/refractory CD19+BCMA+ plasma cell neoplasms and lymphomas/leukemias with plasmacytic differentiation.
Timeframe: MTD will be determined based on DLTs observed during the first 28 days of study treatment