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Immunohistochemical characterization of 'small, lymphoid-like cell populations' within germinomas: Immunologic and molecular approaches to diagnosis

, : Immunohistochemical characterization of 'small, lymphoid-like cell populations' within germinomas: Immunologic and molecular approaches to diagnosis. Cancer Letters 90(2): 183-189

Little is known to date about the biological and molecular characteristics of 'small lymphoid cells' within intracranial germinomas. Frozen sections from three germinoma specimens were evaluated immunohistochemically in order to identify Phenotypic markers expressed on human lymphoid cells as well as intercellular adhesion molecules. In addition, T-cell receptor (TCR) variable alpha- and beta-chain MRNA expression was analyzed by polymerase chain reaction (PCR). The small cells stained faintly with anti-CD5 in two specimens, but were negative for the T cell specific markers, CD2, CD3, CD7, and CD8. In addition, these cells were weakly positive for CD11b (Mac-1) and CD54 (ICAM-1), but were negative for lymphocyte-specific CD11a (LFA-1) and CD11c (p 150,95). No TCR V-alpha or V-beta gene expression was detected by PCR within these germinoma specimens. The small cells of germinomas with the cytologic appearance of lymphocytes are not derived from T-cells or other lymphocytic lineages.


PMID: 7736454

DOI: 10.1016/0304-3835(95)99394-9

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