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Variable heavy-chain gene analysis of follicular lymphomas: subclone selection rather than clonal evolution over time
W M Aarts1, R J Bende, J G Bossenbroek
1Department of Pathology, Academic Medical Center, Amsterdam, The Netherlands.
Blood
|June 22, 2001
Summary
Follicular lymphoma (FL) subclones present at relapse were preexistent and did not evolve over time. This finding challenges the traditional view of antigen-driven B-cell receptor evolution in follicular lymphoma.
Area of Science:
- Hematology
- Oncology
- Immunology
Background:
- Follicular lymphoma (FL) is a common indolent non-Hodgkin lymphoma characterized by B-cell receptor (BCR) expression.
- Understanding BCR evolution is crucial for comprehending FL pathogenesis and clinical course.
Purpose of the Study:
- To investigate the evolution of B-cell receptor variable heavy chain (V(H)) gene regions in follicular lymphoma.
- To determine if tumor subclones in FL evolve over time or are preexistent.
Main Methods:
- Analysis of immunoglobulin V(H) gene regions from three FL cases at different time points.
- In situ investigation of one FL with high somatic mutation load and intraclonal V(H) gene diversity.
- Amplification and sequencing of V(H) gene transcripts from approximately 50 tumor cells isolated by laser microdissection.
Main Results:
- In one FL, the prevalent subclone at relapse showed a mutation pattern identical to a subclone from the presentation biopsy 9 years earlier.
- In a second FL, the dominant relapse subclone was confirmed to be present in the initial biopsy.
- These findings indicate that FL subclones found in relapses are preexistent and do not demonstrate significant evolution over time.
Conclusions:
- The study challenges the concept of antigen-driven BCR evolution in FL.
- Preexistent subclones, rather than ongoing evolution, may drive disease course and relapse in follicular lymphoma.