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Koch, C.A.* ; Vortmeyer, A.O.* ; Diallo, R.* ; Poremba, C.* ; Giordano, T.J.* ; Sanders, D.* ; Bornstein, S.R.* ; Chrousos, G.P.* ; Pacak, K.*

Survivin: A novel neuroendocrine marker for pheochromocytoma.

Eur. J. Endocrinol. 146, 381-388 (2002)

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OBJECTIVE: To study survivin expression in human adrenal medulla and in benign and malignant pheochromocytoma tissue as a tool to predict tumor metastatic potential and prognosis. DESIGN: Blinded study to assess the role of the anti-survivin antibody in chromaffin cells. METHODS: We performed immunohistochemistry with a purified rabbit-polyclonal anti-survivin antibody on 39 formalin-fixed and paraffin-embedded pheochromocytoma/paraganglioma specimens, and on 10 normal adrenal medulla samples from patients unaffected by a chromaffin cell tumor. Fourteen samples were from 14 patients with benign pheochromocytoma (<8 year follow-up, mean 5.2 years), 18 specimens were from 12 patients with malignant pheochromocytoma (<13 year follow-up, mean 6.3 years), 5 samples were from 2 patients with malignant paraganglioma (<6 year follow-up, mean 4 years), and 2 specimens from 2 patients with benign paraganglioma (<7 year follow-up, mean 5.5 years). Malignancy was defined by metastases in non-chromaffin tissues. Staining intensity with the anti-survivin antibody was scored from 0 (none) to 3+ (heavy). Tissues from human kidney, breast, and melanoma served as controls. RESULTS: All pheochromocytoma/paraganglioma specimens stained either 2+ or 3+. By analysis of variance (ANOVA), there was no statistically significant difference between the staining intensity of benign and malignant samples. All normal adrenal medulla specimens stained positively with anti-survivin but to a lesser degree than the chromaffin cell tumors (P<0.01). CONCLUSIONS: Based on these findings, we conclude that (i) survivin may represent a novel neuroendocrine marker for chromaffin cell tumors, and (ii) survivin does not appear to reliably distinguish benign from malignant pheochromocytomas/paragangliomas and thus does not identify patients at risk of recurrent disease.

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