Diagnostic Use

This assay is used to assess T-cell clonality by detecting T-cell receptor gamma (TRG) gene rearrangements in blood, bone marrow, or tissue specimens. Detection of a clonal rearrangement pattern may support the presence of a clonal T-cell population and can assist in the investigation of suspected T-cell lymphoproliferative disorders.
Note: Results should not be interpreted in isolation. Although molecular clonality testing is informative in the majority of cases, the presence of a clonal T-cell population is not, by itself, diagnostic of malignancy. Findings should always be interpreted in the context of the clinical presentation, morphology, immunophenotypic studies, and other relevant laboratory investigations.

Interpretation

Information on T-Cell Receptor Gene Rearrangement Analysis:

During normal T-cell development, T-cell receptor (TR) genes undergo somatic rearrangement of variable (V) and joining (J) gene segments to generate a diverse T-cell repertoire. As each T-cell clone possesses a unique rearrangement pattern that is inherited by all progeny cells, analysis of T-cell receptor gene rearrangements can be used to assess T-cell clonality.

This assay analyses T-cell receptor gamma gene rearrangements by PCR to investigate suspected T-cell lymphoproliferative disorders. Detection of a clonal rearrangement pattern may support the presence of a clonal T-cell population, while a polyclonal pattern is more consistent with a reactive T-cell proliferation. Clonal TRG rearrangements are detected in the majority of T-cell neoplasms, irrespective of whether a functional T-cell receptor is expressed.

Results should not be interpreted in isolation. Molecular evidence of clonality is not, by itself, diagnostic of malignancy, and a negative result does not exclude a T-cell neoplasm. Findings should always be interpreted in conjunction with the clinical presentation, morphology, immunophenotypic studies, and other relevant laboratory investigations.