BCL6 and lymphoma: BCL6 and Ki-67 were positive in areas with large cells; c) Bone Marrow Biopsy: The bone marrow examination revealed no lymphoma infiltration; and d) Cytogenetics and Additional Testing: While no molecular testing such as PCR for IGH gene rearrangements was done, the light chain restriction confirmed the monoclonality of the B cells, which was significant enough to support the lymphoma diagnosis.