Elsevier

Molecular Diagnosis

Volume 4, Issue 2, June 1999, Pages 119-133
Molecular Diagnosis

Original Research
Enhanced sensitivity with a novel TCRγ PCR assay for clonality studies in 569 formalin-fixed, paraffin-embedded (FFPE) cases2

https://doi.org/10.1016/S1084-8592(99)80036-8Get rights and content

Background:

Clonal rearrangement of genes encoding the immunoglobulins (Ig) and T-cell antigen receptors (TCR) are considered to be useful markers for the diagnosis of lymphoma and for determining the clonal origins of B- and T-cell populations in lymphoid neoplasms.

Methods and Results:

Polymerase chain reaction-based clonality assays for TCRγ, TCRβ, and immunoglobulin (Ig) heavy chain (IgH) gene rearrangements were evaluated for diagnostic sensitivity and specificity in 569 formalin-fixed, paraffin-embedded (FFPE) tissues. Combined TCRβ and TCRγ assays enhanced the routine detection of TCR clonality to 90% of all peripheral T-cell lymphoma (PTCL) cases. IgH clonality was detected in 59% of 241 peripheral T-cell lymphoma (BCL) cases and 6% of 169 PTCL cases. Of 452 lymphomas, 5% could not be classified phenotypically as B or T lineage after immunohistochemical and clonality studies. Of all BCL cases analyzed, 24% had detectable TCRβ and/or TCRγ clonality. Of these BCL with biclonal results, 47% were extranodal lymphomas from skin and various tissues.

Conclusions:

Clonality assays were useful for distinguishing reactive or benign lymph nodes from neoplastic lymphoid infiltrates in most cases. The inclusion of TCRβ and TCRγ assays in the assessment of lymphomas results in a significant increase in the sensitivity of clonality detection, but is of limited utility in assessing the T- or B-cell phenotype of the tumor.

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    Supported by a grant from the American Registry of Pathology, 2215 (AEK), and the intramural funds of the Armed Forces Institute of Pathology.

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