RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A breast carcinoma that is characterized by large cell size, polygonal shape, low nuclear-cytoplasmic ratio, finely granular eosinophilic cytoplasm, occasionally prominent nucleoli, peripheral palisading, mitosis, and necrosis and in which greater than 50% of the tumor cells are positive for neuroendocrine markers (NSE, chromogranin A, synaptophysin). (DO)