BCL6 and diffuse large B-cell lymphoma: Patients with DLBCL are always subclassified into the germinal center B-cell (GCB) group, expressing CD10 and/or BCL-6 without MUM-1, and the non-GCB group, expressing MUM-1 without CD10 and BCL-6 (Figures 2J–L) (37, 64).