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  • 1
    ISSN: 1432-069X
    Keywords: Mycosis fungoides ; Histopathology ; Benign inflammatory dermatoses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cutaneous infiltrate in mycosis fungoides (MF) is predominantly composed of T4-positive T-cells. Attempts to distinguish the early stages of this condition from benign inflammatory infiltrates using anti-T3, T4 and other T-cell-associated antibodies have hitherto been unsucessful. Recently a monoclonal antibody BE 2 has been described as selectively reacting against leukemic cells in patients with cutaneous T-cell lymphoma. To investigate whether the BE 2 antigen is differentially expressed in different stages of MF and benign dermatoses, thus facilitating diagnosis, especially of early MF, the reactivity of monoclonal antibody BE 2 against cutaneous infiltrates from such conditions was assessed. In the early stages of MF only a small number of reactive cells was present. In benign inflammatory infiltrates, especially in those that clinically and histologically were hardly distinguishable from early MF, BE 2 reactivity was essentially the same as in eczematous-stage MF. Lesions from plaque and tumor stage MF contained large numbers of BE 2-reactive cells. Our results indicate that expression of BE 2 is associated with the stage of a given MF lesion and is essentially identical in early MF and eczematous lesions with a similar histopathological appearance.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Kutane T-Zellymphome ; Klonalität ; Gamma-T-Zellrezeptor ; Polymerasekettenreaktion (PCR) ; Key words Cutaneous T-cell lymphoma ; Clonality ; Gamma-T-cell receptor ; Polymerase chain reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Differentiation of a cutaneous lymphoma from a reactive lymphoid infiltrate is a demanding challenge for the pathologist. In this retrospective study we examined 24 paraffin-embedded tissue samples from lesions diagnosed as lymphomas and 7 control samples of skin affected by benign changes and with pronounced lymphoid infiltrates for clonal rearrangement of the gamma T-cellreceptor. Using PCR technology we demonstrated clonality in 22 cases of lymphoma (92 %). Thus, the primer combination used in this study covering the four main groups (I–IV) of the variable region of the gamma T-cell receptor gene allows high sensitivity. No clonality was demonstrable in any of the 7 control cases. This study demonstrates the growing importance of PCR technology for the diagnosis of lymphoma.
    Notes: Zusammenfassung Die Unterscheidung eines kutanen Lymphoms von einem reaktiven lymphoiden Infiltrat gehört zu den anspruchsvollsten Differentialdiagnosen in der Dermatohistopathologie. Im Rahmen einer retrospektiven Studie untersuchten wir 24 in Paraffin eingebettete Proben von Hautveränderungen, bei denen klinisch und histologisch ein T-Zellymphom diagnostiziert wurde, auf ein klonales Rearrangement des Gamma-T-Zellrezeptors mittels der Polymerasekettenreaktion (PCR). Als Kontrollen wurden 7 Biopsien entzündlicher Hautveränderungen mit einem ausgeprägten lymphoiden Infiltrat untersucht. Der Klonalitätsnachweis gelang in 22 von 24 Fällen der Lymphome (92 %). Bei den 7 Kontrollbiopsien konnte keine Klonalität nachgewiesen werden. Insofern ermöglicht die von uns gewählte Primerkombination, die jede der vier Hauptgruppen des Gam- ma-T-Zellrezeptorgens (V γ 1–8, V γ 9, V γ 10 und V γ 11) berücksichtigt, eine hohe Sensitivität. Die Untersuchung bestätigt die wachsende Bedeutung dieser Technik für die Diagnostik von Lymphomen.
    Type of Medium: Electronic Resource
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