title: Immunophenotypic analysis of primary malignant lymphoma of the brain.
abstract: The immunophenotypes in three cases of primary malignant lymphomas of the brain were analyzed by flow cytometry using a panel of monoclonal antibodies. In all three cases the immunophenotypes were CD10 negative, CD19 positive, and CD20 positive, and in two cases human leukocyte antigen (HLA)-DR positive. CD20 showed high positivity (80-97%), while CD19 revealed low positivity (30-50%). These neoplastic cells apparently became malignant at the B-cell differentiation stage, when they expressed both CD19 and CD20. Differentiation continued until CD19 was no longer expressed, when further differentiation stopped between the last stage of B-cell differentiation and the early stage of plasma cell formation (Case 3 was CD38 positive). Case 1 was immunoblastic type lymphoma and the cells were both surface immunoglobulin and HLA-DR negative. At least 40% of Case 2 cells showed both B-cell and T-cell markers. Immunophenotypic study can help determine the cell lineage, clonality, and stage of differentiation of lymphoid neoplasms.
authors.affiliation: Division of Neurosurgery, Tochigi Cancer Center, Utsunomiya.
authors.forename: T
authors.initials: T
authors.lastname: Arai
authors.forename: M
authors.initials: M
authors.lastname: Nagai
authors.forename: S
authors.initials: S
authors.lastname: Okuhata
mesh_terms: D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal / Q000276:immunology; D015703:Antigens, CD / Q000276:immunology; D001932:Brain Neoplasms / Q000175:diagnosis / Q000276:immunology* / Q000648:ultrastructure; D005260:Female; D005434:Flow Cytometry; D006684:HLA-DR Antigens / Q000276:immunology; D006801:Humans; D016130:Immunophenotyping; D008228:Lymphoma, Non-Hodgkin / Q000175:diagnosis / Q000276:immunology* / Q000648:ultrastructure; D008297:Male; D010784:Photomicrography
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D006684:HLA-DR Antigens