To Evaluate the Safety and Efficacy of Human BCMA Targeted CAR-NK Cells Injection for Subjects With R/R MM or PCL
This study is a single-arm, open-label, dose-escalation trial to explore the safety, tolerability and pharmacokinetic/pharmacodynamics characteristics of human BCMA targeted CAR-NK Cells injection, and to preliminarily observe the efficacy of the trial drug in patients with relapsed/refractory multiple myeloma or plasma cell leukemia.