Silver colloid staining technique for analysis of glioma malignancy

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✓ A silver colloid staining technique for identifying nucleolar organizer region-associated proteins (Ag-NOR's) was applied to 51 human gliomas. These comprised 20 glioblastomas multiforme, 15 anaplastic astrocytomas, and 16 astrocytomas, in which the mean numbers of Ag-NOR's per cell (± standard error of the mean) were 2.51 ± 0.12, 2.01 ± 0.10, and 1.76 ± 0.06, respectively. Significant differences among these were recognized, and the mean number of Ag-NOR's paralleled the degree of histopathological malignancy. In 16 cases, studies were performed of the number of Ag-NOR's and the S-phase fraction by in vitro labeling using anti-bromodeoxyuridine monoclonal antibody. A linear relationship was demonstrated between these two factors (r = 0.857, p < 0.001), although some scatter was seen. In 32 adult patients, the correlation between the number of Ag-NOR's and the prognosis was estimated. The results demonstrated that the group containing patients with less than 1.80 Ag-NOR's per cell had a better prognosis than the group with 1.80 Ag-NOR's or more. Thus, the number of Ag-NOR's reflected the degree of histopathological malignancy, S-phase fraction, and prognosis. Silver colloid staining for Ag-NOR's is a simple, rapid, and reproducible method for estimating the proliferative potential of human gliomas without requiring a complicated technique.

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Contributor Notes

Address reprint requests to: Koji Kajiwara, M.D., Department of Neurosurgery, Yamaguchi University School of Medicine, Kogushi 1144, Ube-shi, Yamaguchi-ken 755, Japan.

© AANS, except where prohibited by US copyright law.

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