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In practice, this is inferred by the detection of only one of the mutually exclusive antibody light chains, kappa or lambda, on the entire population of the abnormal B cells. Normal B lymphocytes consist of a stew of different antibody-producing cells, resulting in a mixture of both kappa- and lambda-expressing cells.
High-resolution electrophoresis and serum and urine immunofixation are recommended to help identify and characterize the monoclonal IgM paraprotein. The light chain of the monoclonal protein is usually the kappa light chain. At times, patients with Waldenström macroglobulinemia may exhibit more than one M protein. Plasma viscosity must be ...
Abnormal free light chain production has also been reported to be prognostic of a worse outcome in multiple myeloma [36] [37] [38] and chronic lymphocytic leukaemia. [39] An abnormal light-chain ratio has been defined as a kappa to lambda chain ratio of less than 0.26 or more than 1.65. [32]
Light chain MGUS is defined as a disorder in which a serum κ to λ free light chain ratio falls outside the normal range of 0.26–1.65 (mean =0.9) provided that it is not associated with: a) any of the CRAB criteria, b) a bone marrow plasma cell count of 10 or a higher percentage of nucleated cells, c) evidence of amyloid deposition (see ...
Myeloma cells produce monoclonal proteins of varying types, most commonly immunoglobulins (antibodies) and free light chains, resulting in abnormally high levels of these proteins in the blood. Depending on the size of these proteins, they may be excreted through the kidneys. Kidneys can be damaged by the effects of proteins or light chains.
Individuals with CBL-MZ commonly present with: B-cell blood counts that are extremely high (>4.0x10 9; range 3.0x10 9 /L to 37.1x10 9 /L);, [6] represent a large percentage of cases that would otherwise be designated as non-CLL/SLL MLB; [2] often have an IgM monoclonal gammopathy, i.e. high blood levels of a monoclonal IgM antibody; and in ...
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