TNFSF13B and acute lymphoblastic leukemia: Next, we comprehensively tested the in vitro cytotoxicity of the BAFF CAR-T cells against several different cell lines that represent different B cell malignancies: Jeko-1 (MCL), rs4;11 (ALL), RPMI-8226 (MM), U266 (MM), and MM.1s (MM) cell lines.