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Updated: May 1, 2026

Multiplexed Fluorescent Immunohistochemical Staining, Imaging, and Analysis in Histological Samples of Lymphoma
Published on: January 9, 2019
[Pathologic diagnosis of mature B-cell lymphoma]
Insights
Pathologic diagnosis of mature B-cell lymphoma (BCL) relies on identifying surface immunoglobulin (sIg) via flow cytometry (FCM). Further immunohistochemistry (IHC) is crucial for differentiating low-grade from high-grade BCL subtypes.
Area of Science:
- Hematopathology
- Oncology
- Immunology
Context:
- Accurate diagnosis of mature B-cell lymphomas (BCLs) is critical for appropriate patient treatment.
- Mature B-cells are characterized by surface immunoglobulin (sIg), detectable by flow cytometry (FCM) but not immunohistochemistry (IHC).
- BCLs are graded based on proliferation patterns and MIB-1 index, necessitating specific diagnostic markers.
Purpose:
- To outline the diagnostic procedure for mature B-cell lymphomas (BCLs).
- To define mature B-cells and their detection methods.
- To detail the markers required for differentiating BCL subtypes.
Summary:
- Mature B-cell lymphoma (BCL) diagnosis involves identifying surface immunoglobulin (sIg) using flow cytometry (FCM).
- Subclassification into low-grade and high-grade BCL is based on cellular proliferation and MIB-1 index.
- Immunohistochemistry (IHC) with markers like CD5, CD10, BCL-2, BCL-6, MUM-1, and cyclin D1 is essential for precise diagnosis.
Impact:
- Establishes a clear diagnostic pathway for mature B-cell lymphomas.
- Highlights the complementary roles of FCM and IHC in BCL subtyping.
- Aids in distinguishing between low and high-grade BCL for targeted therapy selection.
Abstract:
Procedure of pathologic diagnosis of mature B-cell lymphoma (BCL) was explained. A definition of mature B-cell is given to have surface immunoglobulin (sIg) and it is easily detected by flow cytometry(FCM), but not by immunohistochemistry (IHC). Mature BCLs are subdivided into low grade BCL showing diffuse proliferation of CD2+ B-cells with low MIB-1 index or nodular proliferation of B-cells and high grade BCL showing diffuse proliferation of B-cells with high MIB-1 index. To make a proper diagnosis for low and high grade BCL, respectively, secondary IHC with CD5, CD10, BCL-2, BCL-6, MUM-1 and cyclin D1 is needed. Detecting clonality of light chain of sIg, FCM is useful for mature BCL.
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