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Clonality analysis of follicular lymphoma using laser capture microdissection method.
Amane Yamauchi1, Shinichi Nakatsuka, Itsuko Miyanaga
1Second Department of Pathology, Kagawa Medical University, Kagawa, Japan.
International Journal of Molecular Medicine
|October 10, 2002
Summary
Follicular lymphoma (FL) studies reveal a single clone of neoplastic cells within follicles. Immunoglobulin heavy chain gene rearrangement analysis with microdissection aids in differentiating FL from hyperplasia.
Area of Science:
- Hematology
- Oncology
- Molecular Biology
Background:
- Follicular lymphoma (FL) is a common B-cell malignancy.
- Distinguishing FL from reactive follicular hyperplasia is crucial for accurate diagnosis and treatment.
Purpose of the Study:
- To determine if a single clone of neoplastic cells is present within the follicles of follicular lymphoma.
- To evaluate the utility of PCR-based immunoglobulin heavy chain gene rearrangement analysis combined with laser capture microdissection for diagnosing FL.
Main Methods:
- Analysis of 12 follicular lymphoma cases with varying histologic grades.
- Selective DNA extraction from neoplastic follicles using laser capture microdissection.
- Semi-nested PCR amplification of immunoglobulin heavy chain variable region gene rearrangements using Fr2A and Fr3A primers.
Main Results:
- A common band, indicative of a single clone, was observed in 11 out of 12 FL cases using either Fr2A or Fr3A primers.
- Oligoclonal bands were more frequent with Fr3A primers and in lower-grade FL (grades I and II).
- PCR analysis of whole sections showed smear or oligoclonal bands, highlighting the specificity of microdissection.
Conclusions:
- Neoplastic follicles in follicular lymphoma consistently harbor a single clone of neoplastic cells.
- PCR-based immunoglobulin heavy chain gene rearrangement analysis coupled with microdissection is a valuable tool for the differential diagnosis of FL.