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Monoclonal B lymphocytosis (MBL) is an asymptomatic clinical syndrome wherein small B cell clones are detectable in the peripheral blood. MBL is common in the adult population, with an estimated prevalence of greater than 3% among individuals over age 50. Most MBLs have an immunophenotype similar to chronic lymphocytic leukemia (CLL). Recently, MBL has been shown to be a precursor state for CLL, though most MBLs presumably do not progress to CLL. Therefore, there has been considerable interest in the biology of MBL to better understand the mechanisms of CLL leukemogenesis. We have investigated immunoglobulin heavy chain gene usage and clonality in MBL. These investigations reveal that most MBLs use mutated heavy chains typically associated with good-risk CLL, and that MBLs are frequently oligoclonal, rather than monoclonal. Deletion of chromosome 13q14 is also commonly observed. These and other ongoing studies may help illuminate the pathogenesis of CLL.
Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA.
This article was published in the following journal.
Name: Leukemia & lymphoma
Molecular alterations leading progression of asymptomatic CLL-like high-count monoclonal B lymphocytosis (hiMBL) to chronic lymphocytic leukemia (CLL) remain poorly understood. Recently, genome-wide a...
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Conditions characterized by the presence of M protein (Monoclonal protein) in serum or urine without clinical manifestations of plasma cell dyscrasia.
A lymphoid leukemia characterized by a profound LYMPHOCYTOSIS with or without LYMPHADENOPATHY, hepatosplenomegaly, frequently rapid progression, and short survival. It was formerly called T-cell chronic lymphocytic leukemia.
A group of disorders resulting from the abnormal proliferation of and tissue infiltration by LANGERHANS CELLS which can be detected by their characteristic Birbeck granules (X bodies), or by monoclonal antibody staining for their surface CD1 ANTIGENS. Langerhans-cell granulomatosis can involve a single organ, or can be a systemic disorder.
Excess of normal lymphocytes in the blood or in any effusion.
A malignancy of mature PLASMA CELLS engaging in monoclonal immunoglobulin production. It is characterized by hyperglobulinemia, excess Bence-Jones proteins (free monoclonal IMMUNOGLOBULIN LIGHT CHAINS) in the urine, skeletal destruction, bone pain, and fractures. Other features include ANEMIA; HYPERCALCEMIA; and RENAL INSUFFICIENCY.