NCAM1 and diffuse large B-cell lymphoma: Its incidence is reported to be 0.5 to 7% of DLBCLs, but is actually unknown since CD56 is generally not included in the immunohistochemical or flow cytometric panel for the diagnosis of DLBCL.10,11,12,13,14,15,16,17,18 In our series of patients with DLBCL NOS expression of CD56 was present in 3% of patients and varied in intensity from weak to very strong and diffuse.