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Nucleophosmin expression in renal cell carcinoma and oncocytoma

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Sari A, Calli A, Altinboga AA, Pehlivan FS, Gorgel SN, Balci U, Ermete M, Dincel C, Cakalagaoglu F. Nucleophosmin expression in renal cell carcinoma and oncocytoma. APMIS 2012; 120: 187–94.

The objective of this study was to investigate nucleophosmin/B23 (NPM) expression in renal cell carcinomas (RCC) and renal oncocytomas. The expression of NPM was studied by immunohistochemical methods on 59 RCCs, 9 oncocytomas, and 19 tumour‐negative renal tissues. The expression was assessed relative to various clinicopathological variables and histological subtypes, to determine its potential role as a prognostic and diagnostic marker. All tumours showed nuclear staining, and a minority also exhibited cytoplasmic immunoreactivity. Two patterns of nuclear staining were observed: nuclear staining with a prominent nucleolus (nucleolar staining) and nuclear staining without a prominent nucleolus. There were significant differences, in both nuclear staining and cytoplasmic NPM expression, between oncocytomas and chromophobe RCCs (p < 0.001) and clear cell RCCs (p < 0.001). Cytoplasmic NPM expression was markedly lower in RCCs than in oncocytomas. A statistically significant correlation was discovered between nucleolar staining and nuclear grade (p < 0.001, r = 0.5). No relationship was found between cytoplasmic expression of NPM and any of the clinicopathological parameters or survival. NPM might be a useful immunohistochemical marker for differential diagnosis between oncocytoma and chromophobe RCC. In addition, increased nucleolar NPM expression in RCCs appears to be associated with tumour progression.
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Document Type: Research Article

Affiliations: 1: Department of 1st Urology, Izmir Ataturk Training and Research Hospital, Izmir, Turkey 2: Department of Pathology

Publication date: 01 March 2012

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