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Subependymal giant cell astrocytoma

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Summary

Twenty-two cases of subependymal giant cell astrocytoma (SGCA), five of which associated with tuberous sclerosis, were reviewed by conventional neurohistological stains and by peroxidase-antiperoxidase (PAP) immunohistochemistry for glial fibrillary acidic (GFA) protein, the 68 Kd neurofilament subunit (68 Kd-NF), and neuron-specific enolase (NSE). Neurohistological stains confirmed the presence of PTAH-positive fibrils and the absence of Nissl bodies and of neurites originating from the tumor cells. GFA protein-positive cells were present in all tumors not associated with tuberous sclerosis. However, the number of positive cells in each tumor was highly variable. GFA protein-positive cells were rare in the two SGCA accompanying tuberous sclerosis and absent in the remaining three. Neurohistological stains showed no differences between GFA protein-positive and negative cells. 68 Kd-NF-positive cells were found in six tumors. In one tumor, associated with tuberous sclerosis, it was present in the large ganglion-like cells only. NSE-positive cells were found in 13 of 18 tumors examined, including four of the five SGCA associated with tuberous sclerosis. The significance of NSE-positivity in central neuroepithelial neoplasms in respect of their possible neuronal origin remains open.

This study suggests that the SGCA, especially those associated with tuberous sclerosis, include cells that are apparently unable to express GFA protein. Some of the tumor cells express the 68 Kd-NF, but this expression falls short of the complete expression of neuronal differentiation. The unique morphological appearances of the SGCA and the discrepancies reported in electron-microscopic and immunohistochemical studies suggest that the cell of origin of these tumors is the product of a dysgenetic event in early development. As a result, the potential of that cell for astrocytic or neuronal differentiation may be incompletely or aberrantly expressed, in particular when the stigmata of tuberous sclerosis are also present. No evidence of obvious ganglionic differentiation and no inference of a neuronal origin of the tumor cells in SGCA could be adduced from the present histochemical findings. This study supports the general interpretation of these tumors as a variant of astrocytoma.

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Authors and Affiliations

  1. Division of Neuropathology, Dept. of Pathology, University of Virginia School of Medicine, 22908, Charlottesville, VA, USA

    J. M. Bonnin, L. J. Rubinstein & S. Ch. Papasozomenos

  2. Biological Psychiatry Branch, National Institute of Mental Health, 20205, Bethesda, MD, USA

    P. J. Marangos

Authors
  1. J. M. Bonnin
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  2. L. J. Rubinstein
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  3. S. Ch. Papasozomenos
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  4. P. J. Marangos
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Additional information

Supported in part by research grant CA 31271 (LJR) from the National Cancer Institute, US Dept. of Health and Human Services

Dr. Bonnin is supported by Clinical Fellowship no. 5732 of the American Cancer Society and by Neuropathology Research Training grant T32 NS 07236 of the National Institute of Neurological and Communicable Diseases and Stroke, US Dept. of Health and Human Services

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Bonnin, J.M., Rubinstein, L.J., Papasozomenos, S.C. et al. Subependymal giant cell astrocytoma. Acta Neuropathol 62, 185–193 (1984). https://doi.org/10.1007/BF00691851

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  • DOI: https://doi.org/10.1007/BF00691851

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