Treated patients had a median surface expression level of BCMA and TACI of 596 (430–780) and 381 (0–1819) antigens bounds per cell (ABC), respectively, from BM tumor cells at study entry and antigen expression was maintained following CAR T-cell infusion as measured from 1 month and at disease progression (online supplemental table 3). This evidence concerns the gene TNFRSF13B and neoplasm.