A preparation of allogeneic, off-the-shelf, T-lymphocytes that have been genetically modified using a proprietary synthetic nuclease-based system to express a chimeric antigen receptor (CAR) targeting the tumor-associated antigen (TAA) B-cell maturation antigen (BCMA; tumor necrosis factor receptor superfamily member 17; TNFRSF17), with potential immunostimulating and antineoplastic activities. Upon administration, allogeneic anti-BCMA-CAR T-cells PBCAR269A specifically recognize and kill BCMA-expressing tumor cells. BCMA, a receptor for both a proliferation-inducing ligand (APRIL) and B-cell activating factor (BAFF), is a member of the tumor necrosis factor receptor superfamily (TNFRSF). BCMA is found on the surfaces of plasma cells, is overexpressed on malignant plasma cells and plays a key role in plasma cell proliferation and survival.