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Cases of non-CLL/SLL MBL in which the monoclonal B cells do not express CD5, CD23, CD10, or CD103 but strongly express CD79B and light chain Ig have been tentatively designated as having monoclonal B-cell lymphocytosis of the marginal zone (i.e. CBL-MZ). This term is used because normal marginal zone B-cell lymphocytes express these markers.
Lymphocytosis is an increase in the number or proportion of lymphocytes in the blood.Absolute lymphocytosis is the condition where there is an increase in the lymphocyte count beyond the normal range while relative lymphocytosis refers to the condition where the proportion of lymphocytes relative to white blood cell count is above the normal range.
These B-cells are monoclonal, which means they are produced by a single ancestral B-cell. They share some of the same cell marker proteins, chromosome abnormalities, and gene mutations that are found in CLL. [37] [38] CLL-type MBL can be separated into two groups: Low-count MBL has monoclonal B-cell blood counts of <0.5x10 9 cells/liter (i.e. 0 ...
The lymphocytes are primarily B cells (e.g., express CD20 and CD10 markers) with rare T cells evident only in the background. [32] The B cells are derived mostly from germinal center B cells, contain EBV in latency I phase, and express high levels of EBNA1 and EBER viral products. Some cases also express other EBNA and the LMP2A products. [1]
B cells, also known as B lymphocytes, are a type of white blood cell of the lymphocyte subtype. [1] They function in the humoral immunity component of the adaptive immune system. [1] B cells produce antibody molecules which may be either secreted or inserted into the plasma membrane where they serve as a part of B-cell receptors. [2]
Persistent polyclonal B-cell lymphocytosis (PPBL) is an anomaly of the human immune system characterized by mildly elevated levels of white blood cells (called leukocytosis), chronic, stable absolute polyclonal B-cell lymphocytosis, elevated polyclonal IgM and binucleated cells. Although cases of non-smoking women or men have been reported ...
However, the influential WHO Classification (published in 2001) emphasized a greater emphasis on cell lineage. To this end, lymphoid leukemias can also be divided by the type of cells affected: B-cell leukemia; T-cell leukemia; NK-cell leukemia; The most common type of lymphoid leukemia is B-cell chronic lymphocytic leukemia.
A B-cell leukemia is any of several types of lymphoid leukemia which affect B cells. [1] Types include (with ICD-O code): [citation needed] 9823/3 - B-cell chronic lymphocytic leukemia/small lymphocytic lymphoma; 9826/3 - Acute lymphoblastic leukemia, mature B-cell type; 9833/3 - B-cell prolymphocytic leukemia; 9835/3-9836/3 - Precursor B ...