title: CLL and diffuse histiocytic lymphoma in one patient: clonal proliferation of two different B cells.
abstract: A case report is presented of a 77-year-old woman suffering from a composite lymphoma, known as Richter's Syndrome, consisting of chronic lymphocytic leukaemia (CLL) and diffuse histiocytic lymphoma. Light-microscopic investigation revealed the presence of CLL cells in the blood and bone marrow and a combination of CLL cells and large immunoblastic cells in the lymph node. Immunological investigation showed that both malignant cell types were B cells. The CLL cells carried a monoclonal surface immunoglobulin (S-Ig) micron lambda, and the immunoblastic cells had a monoclonal S-Ig micron K. These findings indicated that both clonal lymphoproliferative diseases were probably derived from different tumour stem cells.
mesh_terms: D000368:Aged; D001402:B-Lymphocytes / Q000276:immunology*; D002455:Cell Division; D002478:Cells, Cultured; D002999:Clone Cells; D005260:Female; D005455:Fluorescent Antibody Technique; D006801:Humans; D007945:Leukemia, Lymphoid / Q000276:immunology*; D016403:Lymphoma, Large B-Cell, Diffuse / Q000276:immunology*; D011947:Receptors, Antigen, B-Cell / Q000032:analysis; D012397:Rosette Formation; D013577:Syndrome
chemical_list: D011947:Receptors, Antigen, B-Cell