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Mantle cell lymphoma: The monoclonal B-cells in this aggressive lymphoma are CD5+ in most cases, CD10−, CD23−, CD43+, CD103−, complete Ig+, and express cyclin D1; these cells have translocations between chromosomes 11 and 14 in >95% of cases and in many cases overexpress the SOX11 transcription factor gene. [2]
Once set, light chain class remains fixed for the life of the B lymphocyte. In a healthy individual, the total kappa-to-lambda ratio is roughly 2:1 in serum (measuring intact whole antibodies) or 1:1.5 if measuring free light chains, with a highly divergent ratio indicative of neoplasm. The free light chain ratio ranges from 0.26 to 1.65. [1]
CD5 is a good immunohistochemical marker for T-cells, although not as sensitive as CD3. About 76% of T-cell neoplasms are reported to express CD5, and it is also found in chronic lymphocytic leukemia and mantle cell lymphoma (both being B cell malignancies), that do not express CD3.
Micrograph showing Hodgkin's lymphoma, a type of B cell lymphoma that is usually considered separate from other B cell lymphomas. Field stain. CT scan of primary B cell lymphoma in the left ilium, as diffuse cortical and trabecular thickening of the hemipelvis, mimicking Paget's disease.
Normal B lymphocytes consist of a stew of different antibody-producing cells, resulting in a mixture of both kappa- and lambda-expressing cells. The lack of the normal distribution of these B cells is one basis for demonstrating clonality, the key element for establishing a diagnosis of any B cell malignancy (B cell non-Hodgkin lymphoma). [58]
MCL is a subtype of B-cell lymphoma, due to CD5 positive antigen-naive pregerminal center B-cell within the mantle zone that surrounds normal germinal center follicles. MCL cells generally over-express cyclin D1 due to the t(11:14) translocation , [ 6 ] a chromosomal translocation in the DNA .
B-cell CLL/lymphoma refers to a family of genes associated with certain types of lymphoma and leukemia. Although named for B-cell chronic lymphocytic leukemia , they can be associated with other malignancies.
B-cells form in the bone marrow and undergo gene rearrangement in order to develop B-cell receptors (BCRs) that bind to a specific antigen. Once activated by an antigen, B-cells proliferate and further differentiate into plasma cells and memory B-cells. [4] B-cells that have not encountered an antigen are called naive B cells.
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