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Tumor dedifferentiation: An important step in tumor invasion

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Abstract

Tumor invasionin vivo was studied by light and electron microscopy as well as by immunofluorescence microscopy. Special regard was paid to the grade of tumor differentiation. Dimethylhydrazine-induced murine colonic carcinomas comprising a differentiated and an undifferentiated tumor type with low and high invasiveness respectively, were used. At the invasion front of both tumor types a striking dissociation of the organized tumor cell complexes into isolated tumor cells was found together with a loss of most of the cytological features of differentiation. It is supposed that this process mobilizes the tumor cells from the main tumor bulk enabling them to invade the host tissue by active locomotion. This view is strongly supported by the demonstration of morphological equivalents of active cell movement such as pseudopodia-like cytoplasmic extrusions, adaptive changes of the cell shape and microfilament bundles. Although the proposed mechanism of tumor invasion is essentially the same in both tumor types, the grade of differentiation is nevertheless critical, as in the undifferentiated carcinomas only subtle dedifferentiation steps (loss of basement membrane and cell junctions) are necessary to acquire an invasive status. This fact may explain the comparatively high invasiveness and poor prognosis of undifferentiated carcinomas.

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  1. Institute of Pathology, Johannes Gutenberg-University, D-6500, Mainz, Federal Republic of Germany

    Helmut Gabbert, Rudolf Wagner, Roland Moll & Claus-Dieter Gerharz

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Gabbert, H., Wagner, R., Moll, R. et al. Tumor dedifferentiation: An important step in tumor invasion. Clin Exp Metast 3, 257–279 (1985). https://doi.org/10.1007/BF01585081

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