Clonal T-cell populations and increased risk for cytotoxic T-cell lymphomas in B-CLL patients: clinicopathologic observations and molecular analysis

The American Journal of Surgical Pathology
Antonio MartinezElaine S Jaffe

Abstract

Chronic lymphocytic leukemia (CLL) is associated with increased risk of malignancy, but the occurrence of other lymphomas, in particular T-cell lymphomas, is rare. We identified 7 cases of peripheral T-cell malignancy associated with B-cell-derived CLL from the files of two institutions over a 20-year period. The presence of both B and T lymphoproliferative disorders was confirmed in all cases by immunophenotype and in 6 cases by gene rearrangements. Six patients developed peripheral T-cell lymphoma (PTCL), unspecified, during the course of CLL (10-168 months). In all 5 evaluable cases, the cells had a cytotoxic T-cell phenotype; the sixth case was CD56+, but TIA-1 and Granzyme B could not be studied. A seventh patient with CLL developed mycosis fungoides, and an aggressive NK cell leukemia. To investigate possible risk factors for the development of PTCL, we screened 100 unselected peripheral blood samples from newly diagnosed CLL patients by PCR for the presence of clonal T cell populations. We found evidence of clonal T-cell expansion in 8 patients and increased lymphocytes with large granular lymphocyte morphology in 7 of 8 cases. The immunophenotype was assessed by multicolor flow cytometry and in 4 cases the T-cell expans...Continue Reading

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