This is a study to evaluate the safety, feasibility and efficacy of BCMA CAR-T in the treatment of relapsed or refractory multiple myeloma.~The Main research objectives:~To evaluate the safety and efficacy of BCMA CAR-T in patients with relapsed or refractory multiple myeloma~The Secondary research objectives:~To investigate the cytokinetic characteristics of BCMA CAR-T in patients with relapsed or refractory multiple myeloma.
This study is aimed to evaluate the safety, feasibility and efficacy of BCMA CAR-T in the treatment of relapsed or refractory multiple myeloma