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Bcl-2 distribution in neuroepithelial tumors: an immunohistochemical study

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Summary

Bcl-2proto-oncogene prevents apoptosis in many conditions. First detected in lymphomas, it has been also described in non-lymphoid tissues. The immunohistochemical distribution of bcl-2 protein in 100 neuroepithelial tumors is presented. Bcl-2 was positive in some neurons of normal nervous tissue, in reactive astrocytes and variably in all neuroepitelial tumors. The reaction product was either diffuse or granular, due to bcl-2 protein localization on cytoplasmic, nuclear and mitochondrial membranes. The positivity was high in medulloblastomas and in astrocytic tumors. In the latter, the strongest staining was found in cells retaining the astrocytic aspect. Oligodendroglial cells were minimally stained.

No correlation of bcl-2 staining with survival was found in each tumor type. The interpretation of the results is based on the one side on the constitutive role played by bcl-2 in the nervous tissue and its neoplastic derivatives. On the other side, in tumors bcl-2 acts by preventing tumor cells from undergoing apoptosis. Bcl-2 expression in brain tumors, therefore, receives a dual interpretation. For this reason and for the lacking of correlation with survival, bcl-2 expression cannot be regarded as a prognostic factor.

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Authors and Affiliations

  1. Department of Neurology, University of Turin, Turin, Italy

    D. Schiffer, P. Cavalla, A. Migheli, M. T. Giordana & L. Chiadò-Piat

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  1. D. Schiffer
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  2. P. Cavalla
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  3. A. Migheli
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  4. M. T. Giordana
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  5. L. Chiadò-Piat
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Schiffer, D., Cavalla, P., Migheli, A. et al. Bcl-2 distribution in neuroepithelial tumors: an immunohistochemical study. J Neuro-Oncol 27, 101–109 (1996). https://doi.org/10.1007/BF00177472

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