CD4 and lymphoma: The two CAR T cell-induced lymphomas were each identified as a monoclonal population of CAR+ T cells, with P2 developing a malignant CD4+CD3+ clone with sequence TRAV30*01 TRAJ5*01 TRBV2*01 TRBD*01 TRBJ1-3*01 (CGTIDTGRRALTF- CASSTQGSGNTIYF), and P8 with a malignant CD8+ clone with TRAV9-2_TRAJ28/TRBV7-8_TRBJ1-5 (CAPIYSGAGSYQLTF-CASSSPDRGENQPQHF).