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[Current status regarding detection of monoclonal component in Japan]
1Department of Clinical Laboratory Medicine, Jichi Medical University, Shimotsuke 329-0498, Japan. yamadanji@jichi.ac.jp
Insights
Diagnosing monoclonal gammopathies like multiple myeloma requires identifying M-components and Bence Jones protein (BJP). New methods for detecting free light chains and BJP in urine offer improved diagnostic accuracy.
Area of Science:
- Clinical Chemistry
- Immunology
- Hematology
Context:
- Monoclonal immunoglobulin components (M-components) are detected via electrophoresis.
- Differentiating malignant monoclonal gammopathies (e.g., multiple myeloma) from benign monoclonal gammopathy of undetermined significance (MGUS) is crucial.
- Bence Jones protein (BJP) aids in diagnosing multiple myeloma and AL-amyloidosis.
Purpose:
- To review diagnostic methods for M-components and BJP.
- To highlight the utility of new techniques for detecting free immunoglobulin light chains and BJP.
- To discuss the clinical significance of these markers in differentiating malignant from non-malignant conditions.
Summary:
- Serum protein electrophoresis and immunofixation are standard for M-component identification.
- New methods measuring free immunoglobulin light chains can detect serum BJP.
- Capillary electrophoresis with immunoabsorption detects urinary BJP in unconcentrated samples.
Impact:
- Improved diagnostic accuracy for multiple myeloma and AL-amyloidosis.
- Potential for earlier detection and management of plasma cell disorders.
- Consideration of advanced diagnostic techniques in clinical practice, particularly in Japan.
Abstract:
Monoclonal immunoglobulin component (M-component) presence is suspected based on serum protein analysis using cellulose acetate membrane electrophoresis, and finally clarified by determining its immunoglobulin class using immunoelectrophoresis (IEP) or immunofixation (IFE). M-component presence is essential for diagnosing multiple myeloma (MM) and primary macroglobulinemia; however, since it is also found in non-malignant conditions, called MGUS (monoclonal gammopathy of undetermined significance), the differentiation of MGUS from malignant diseases is often important. Bence Jones protein (BJP), once detected, can support the diagnoses of MM and primary AL-amyloidosis. In the latter condition, which is often difficult to diagnose, BJP is very helpful. The newly developed method measuring free immunoglobulin light chains can effectively indicate the presence of BJP in serum. The detection of BJP in urine is still important. Capillary electrophoresis combined with immunoabsorption can detect BJP in non-concentrated urine. It may be time to take such new methods into consideration in Japan.
