TNFSF4 and neoplasm: Some B cells express or secrete other immunosuppressive molecules, including inducible T‐cell co‐stimulator ligand (ICOSL), OX40 ligand (OX40L), CD40, and C‐X‐C motif chemokine ligand 13 (CXCL13), which inhibit anti‐tumor immune responses.[83, 84, 85] These immunosuppressive molecules may also function as immune checkpoints for B cells.