Immunoglobulin expression in B-cell lymphoma. Immunohistochemical study of 345 cases
1Department of Pathology, Mount Sinai School of Medicine, New York, New York 10029.
Insights
Immunoglobulin expression in B-cell lymphomas varies by histologic type, with higher frequencies in smaller cell types. An excess of lambda light chain expression suggests potential susceptibility to lymphomatous transformation.
Area of Science:
- Hematology
- Oncology
- Immunology
Background:
- B-cell lymphomas are a heterogeneous group of lymphoid malignancies.
- Immunoglobulin (Ig) expression is a key marker of B-cell differentiation.
- Understanding Ig expression patterns is crucial for lymphoma classification and prognosis.
Purpose of the Study:
- To investigate immunoglobulin expression in B-cell lymphomas.
- To correlate Ig expression with histopathologic classification using the Working Formulation.
- To analyze the distribution of kappa and lambda light chains in B-cell lymphomas.
Main Methods:
- Immunohistochemical studies were performed on 345 cases of B-cell lymphoma.
- Cases were classified according to the Working Formulation.
- Immunoglobulin expression (heavy and light chains) was assessed and quantified.
Main Results:
- Immunoglobulin expression was detected in 74% of B-cell lymphomas.
- Highest Ig expression frequencies were observed in small lymphocytic, small cleaved, and small noncleaved cell lymphomas (93-100%).
- Lowest Ig expression frequencies were found in large cell and immunoblastic lymphomas (59%).
- An overall excess of lambda light chain expression was noted (kappa-lambda ratio 1.3), particularly in intermediate lymphocytic and follicular mixed types.
Conclusions:
- Immunoglobulin expression in B-cell lymphomas is significantly influenced by cellular differentiation and histologic type.
- The observed excess of lambda light chain expression in certain subtypes may indicate increased susceptibility to lymphomatous transformation.
- These findings contribute to understanding B-cell lymphoma pathogenesis and classification.
Abstract:
Immunoglobulin expression was studied in a series of 345 cases of B-cell lymphoma by immunohistochemical studies and correlated with the histopathologic classification with the use of the Working Formulation. Immunoglobulin expression was present in 254 cases (74%) of B-cell lymphomas (IgM kappa, 122; IgM lambda, 82; light chain only, 40; mu heavy chain only, 10). Immunoglobulin expression occurred with the greatest frequency in lymphomas of small lymphocytic, small cleaved cell, and small noncleaved cell histologic types (93%, 100%, 100%, respectively) and occurred with the least frequency in lymphomas of large cell (cleaved and noncleaved) and immunoblastic histologic types (59% each). Other lymphomas demonstrated intermediate frequencies of immunoglobulin expression. An excess of cases expressing lambda light chain was noted overall (kappa-lambda ratio of 1.3; expected, 2.0) and was particularly evident for intermediate lymphocytic and follicular mixed histologic types (kappa-lambda ratios of 0.8 and 0.9, respectively). Immunoglobulin expression in B-cell lymphomas varies as a function of cellular differentiation as reflected in the histologic type and grade of the Working Formulation. An excess of cases expressing lambda light chain in specific histologic categories suggests the possibility that lymphocytes bearing the lambda light chain rearrangement may be more susceptible to certain types of lymphomatous transformation.
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