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Assays that detect FLC are important in the diagnosis and monitoring of light chain only multiple myeloma (Bence Jones myeloma) and AL amyloidosis.
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Monoclonal, immunoglobulin free light chains (FLC) are present in the serum and urine of many patients with B-cell proliferative disorders including multiple myeloma and AL amyloidosis. In addition, because of their short serum half-life, changes in serum FLC concentrations provide a rapid indication of the response to treatment. It was concluded that serum FLC assays could be used to follow the disease course in nearly all multiple myeloma patients.
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FLC concentrations fell more rapidly in response to treatment than intact immunoglobulin G (IgG) and showed greater concordance with serum β2 microglobulin concentrations and bone marrow plasma cell assessments.
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Serum FLC concentrations were abnormal in 96% of patients at presentation. Serial samples were assayed from 17 of these patients and the FLC measurements were compared with other disease markers. FLC concentrations were measured in presentation sera from 493 multiple myeloma patients with monoclonal, intact immunoglobulin proteins. We report the results of a study investigating the utility of serum FLC measurements in myeloma patients producing monoclonal intact immunoglobulin proteins. Automated immunoassays, which can measure FLC in serum, are useful for the diagnosis and monitoring of light chain (AL) amyloidosis, Bence Jones myeloma and non-secretory myeloma patients. Monoclonal immunoglobulin free light chains (FLC) are found in the serum and urine of patients with a number of B-cell proliferative disorders, including multiple myeloma.
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