What does PAX5 positive mean?
Pax5 staining is positive in most Hodgkin and B-cell non-Hodgkin lymphomas, and also precursor B-cell lymphoblastic neoplasms. Plasma cell neoplasms, multiple myeloma, and plasmablastic lymphomas typically are negative. T-cell lymphomas are, to date, consistently negative.
What is CD20 positive?
CD20 positive T cell lymphoma is a rare condition that is characterized by the coexpression of CD20 and T cell markers, such as, CD3, CD5, or UCHL-11. Positivity for CD20 in any type of T cell lymphoma represents an aberrant immunophenotype, despite the presence of various indicators of T cell lymphoma.
What is PAX 5 used for?
PAX-5 is a pan-B-cell marker that is very useful in the evaluation of lymphoid lesions, particularly in small biopsies and in cases where CD20 is negative. Although unusual in epithelial malignancies, PAX-5 is expressed in a subset of neuroendocrine carcinomas.
Do plasma cells express PAX5?
PRDM1 binds to the PAX5 promoter and represses PAX5 transcription. It is expressed by all plasma cells and a subset of germinal center B cells (5–15%) differentiating to plasma cells.
What is classic Hodgkin’s lymphoma?
Classical Hodgkin lymphoma is any type of lymphoma that contains a particular type of cell called a Reed–Sternberg cell. Reed–Sternberg cells are abnormal B lymphocytes (white blood cells that make antibodies, which are important in fighting infections).
What is D cell lymphoma?
Diffuse large B cell lymphoma (DLBCL) is a type of non-Hodgkin lymphoma (NHL). NHL is a cancer of the lymphatic system. It develops when the body makes abnormal B lymphocytes. These lymphocytes are a type of white blood cell that normally help to fight infections.
What type of tumor antigen is CD20?
A protein found on B cells (a type of white blood cell). It may be found in higher than normal amounts in patients with certain types of B-cell lymphomas and leukemias. Measuring the amount of CD20 antigen on blood cells may help to diagnose cancer or plan cancer treatment. CD20 antigen is a type of tumor marker.
What do CD20 B cells do?
Not only do they produce autoantibodies, but they regulate other cell types, secrete cytokines, and present antigens. They are thus potential targets for therapeutic intervention. CD20 is a B-cell specific cell surface molecule of uncertain function.
What cells express CD20?
CD20 (cluster of differentiate 20) is a protein that is expressed on the surface of B cells, starting at the pre-B cell stage and also on mature B cells in the bone marrow and in the periphery.
What does CD15 positive mean?
CD15 is present on almost all Reed–Sternberg cells, including their rare mononuclear variants, and, as such, can be used in immunohistochemistry to identify the presence of such cells in biopsies. Hodgkin lymphoma. The presence of these cells is diagnostic of Hodgkin’s lymphoma.
Can classic Hodgkin’s lymphoma be cured?
Classical Hodgkin lymphoma is considered a highly curable disease; however, 20% of patients cannot be cured with standard first-line chemotherapy and have a dismal outcome. Current clinical parameters do not allow accurate risk stratification, and personalized therapies are lacking.