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Flow cytometric analysis of kappa and lambda light chain expression in endoscopic biopsy specimens before the
Satoko Oka1, Kazuo Muroi, Kazuya Sato
1Department of Internal Medicine (I), Osaka Medical College, Takatsuki, Osaka, Japan.
Insights
Flow cytometry analysis of endoscopic biopsies is useful for diagnosing gastrointestinal B-cell lymphoma (BCL). Detecting restricted light chain (RLC) expression aids in identifying B-cell clonality, crucial for BCL diagnosis.
Area of Science:
- Gastroenterology
- Hematology
- Oncology
Background:
- Gastrointestinal B-cell lymphoma (BCL) diagnosis relies on histological examination of endoscopic biopsies.
- Flow cytometry can assess B-cell clonality through light chain expression.
Purpose of the Study:
- To evaluate the utility of flow cytometry in diagnosing gastrointestinal BCL from endoscopic biopsy specimens.
- To determine the significance of restricted light chain (RLC) expression as a marker for BCL.
Main Methods:
- Retrospective analysis of 48 patients with gastrointestinal BCL.
- Flow cytometry performed on endoscopic biopsy specimens to analyze B-cell antigens (CD10) and light chain expression.
- RLC expression defined by kappa/lambda ratios (>3.0 or <0.5).
Main Results:
- Restricted light chain (RLC) expression, indicating B-cell clonality, was observed in 62.5% of patients.
- CD10 positivity was noted in 8.3% of cases without RLC expression.
- Abnormal karyotypes were identified in 16.7% of specimens.
Conclusions:
- Flow cytometry is a valuable tool for diagnosing gastrointestinal BCL when B-cell clonality is suspected.
- Adequate cell numbers in biopsy specimens are essential for reliable flow cytometric analysis.
- RLC expression is a key indicator of B-cell clonality in gastrointestinal lymphoma.
Abstract:
Forty-eight patients with gastrointestinal (GI) tract B-cell lymphoma (BCL) were analyzed retrospectively. The diagnosis was based on the histological examination of specimens obtained by endoscopic biopsy. Before the diagnosis was made, single-color flow cytometry was performed to analyze the expression of light chains and B-cell antigens including CD10 in the specimens. Restricted light chain (RLC) expression, a marker of B-cell clonality, was defined as κ and λ ratios of either more than 3.0 or less than 0.5. The specimens from 30 patients (62.5%) showed RLC expression. No RLC expression or RLC expression not examined was divided into two groups : those showing CD10 positivity in more than 20% of cells (4 patients, 8.3%) and those showing no positivity (14 patients, 29.2%). The cell number analyzed in the latter group was significantly smaller than that in the other two groups. Abnormal karyotypes were found in the specimens from 8 patients (16.7%). These results indicate that the flow cytometric analysis of endoscopic biopsy specimens is useful when BCL is suspected if an adequate number of cells are obtained.
