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Serum protein electrophoresis showing a paraprotein (spike/peak in the gamma zone) in a patient with multiple myeloma.. A myeloma protein is an abnormal antibody (immunoglobulin) or (more often) a fragment thereof, such as an immunoglobulin light chain, that is produced in excess by an abnormal monoclonal proliferation of plasma cells, typically in multiple myeloma or Monoclonal gammopathy of ...
Multiple myeloma is diagnosed based on blood or urine tests finding abnormal antibody proteins (often using electrophoretic techniques revealing the presence of a monoclonal spike in the results, termed an m-spike), bone marrow biopsy finding cancerous plasma cells, and medical imaging finding bone lesions. [6]
Monoclonal gammopathy, also known as paraproteinemia, is the presence of excessive amounts of myeloma protein or monoclonal gamma globulin in the blood. It is usually due to an underlying immunoproliferative disorder or hematologic neoplasms, especially multiple myeloma. It is sometimes considered equivalent to plasma cell dyscrasia.
Note that up to 8% of healthy geriatric patients may have a monoclonal spike. [16] Waldenström's macroglobulinaemia (IgM), monoclonal gammopathy of undetermined significance (MGUS), amyloidosis, plasma cell leukemia and solitary plasmacytomas also produce an M-spike. Oligoclonal gammopathy is indicated by one or more discrete clones. [citation ...
However, since MGUS can lead to multiple myeloma, which develops at the rate of about 1.5% a year, or other symptomatic conditions, yearly monitoring is recommended. The progression from MGUS to multiple myeloma usually involves several steps. In rare cases, it may also be related with a slowly progressive symmetric distal sensorimotor ...
Bence Jones proteins are particularly diagnostic of multiple myeloma in the context of target organ manifestations such as kidney failure, lytic (or "punched out") bone lesions, anemia, or large numbers of plasma cells in the bone marrow. Bence Jones proteins are present in 2/3 of multiple myeloma cases. [3]
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