A 46-year-old woman with a previous diagnosis of sarcoidosis presented with morphologically typical large granular lymphocyte (LGL) leukemia/lymphoma with an aggressive clinical course. Epstein-Barr virus DNA was detected in peripheral blood mononuclear cells by PCR. The phenotype was typical of the T cell lineage (CD2+ CD3+ CD5+ CD7+ CD8+ TCRαβ+) but with the absence of the CD16, CD56, CD57 NK cell markers. In addition, the LGLs expressed CD122 (p75) in the absence of CD25 which is characteristic of LGLs. These leukemic LGLs did not exhibit NK activity. The clonal nature of this proliferation was demonstrated by the rearrangement of the TCRγ gene. This phenotypically unusual but morphologically typical LGL leukemia/lymphoma may represent the clonal expansion of a minor normal subset of T-LGLs which do not express any NK cell markers, probably corresponding to in vivo activated T cells.

Keywords:
Large granular lymphocytes, Large granular lymphocyte leukemia/lymphoma, Sarcoidosis, CD16, CD56, CD57, Epstein-Barr virus
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2001
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