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Wilkinson Nafisa; Buckley, C Hilary; Chawner, Linda; Fox, Harold
International Journal of Gynecological Pathology: January 1990
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Summary:

Nucleolar organiser regions (NORs) can be visualised by a silver stain that shows NOR-associated proteins as black intranuclear dots (AgNORs). NORs are loops of DNA that transcribe to ribosomal RNA, and the number of AgNORs is thought to reflect cellular proliferative activity. A study of AgNOR counts in normal, hyperplastic, and neoplastic endometria is reported. The highest AgNOR counts were found in normal proliferative endometrium and in well-differentiated endometrioid adenocarcinomas that were invading the myometrium. A mean AgNOR count of >9 in curettage material from an atypical proliferative lesion of the endometrium is highly suggestive of an invasive neoplasm.

©1990International Society of Gynecological Pathologists