Nonhistone proteins associated with the nucleolar organizer regions (NORs) can be visualized by a silver-staining technique on paraffin-embedded tissues. The number of black dots (AgNORs) appearing on the nuclei are thought to reflect cell differentiation and can be used as a measurement of cellular proliferative activity. In this study we tested AgNOR staining in ovarian epithelial tumors to evaluate its diagnostic potential in distinguishing between borderline tumors and carcinomas.
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