Canine ovarian epithelial tumours : histopathological and immunohistochemical evaluation with proposed histopathological classification system

Dolenšek, Tamara (author), Knific, Tanja (author), Ramírez, Gustavo A. (author), Erles, Kerstin (author), Mallon, Hannah E. (author), Priestnall, Simon L. (author), Suárez-Bonnet, Alejandro (author)

Canine ovarian epithelial tumours (OETs) are currently divided into ovarian adenomas and carcinomas, which are further inconsistently subclassified as papillary or cystic, whereas in human medicine, OETs are subdivided into several subtypes. This study aimed to establish clear morphological features enabling more consistent distinction between benign OETs and ovarian carcinomas (OvCas) as well as defining different histopathological patterns of canine OvCas. Analysis revealed a mitotic count threshold of >2 as a potential criterion for differentiating OvCas from benign OETs. Alongside ovarian adenomas, ovarian borderline tumours were introduced as a distinct category among benign OETs. OvCas exhibited five different histopathological patterns, namely papillary, solid with tubular differentiation, micropapillary, cystic and sarcomatous. Since some OvCas can morphologically overlap with other ovarian tumours, the expression of cytokeratin 7, a cytokeratin expressed in ovarian epithelium, was assessed and proved helpful, although it was not expressed in all cases. Furthermore, we investigated the expression of 14-3-3σ and cyclooxygenase 2 (COX-2). Based on the frequent expression of 14-3-3σ, this marker appears to have a role in canine OETs since it is not expressed in normal canine ovaries. The infrequent expression of COX-2 suggests that it is a poor candidate as a potential therapeutic target in canine OvCas.

• Language: English
• Keywords: 14-3-3σ protein, canine, CK7, COX-2, ovarian carcinoma, ovarian epithelial tumour, tumour classification, pathology, neoplasms, dogs
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: VF - Veterinary Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: Str. 42-50
• Numbering: Vol. 212
• PID: 20.500.12556/RUL-159800
• UDC: 636.09:616
• ISSN on article: 1532-3129
• DOI: 10.1016/j.jcpa.2024.05.006
• COBISS.SI-ID: 201195267
• Publication date in RUL: 25.07.2024

Record is a part of a journal

• Title: Journal of comparative pathology
• Shortened title: J. comp. pathol.
• Publisher: Elsevier
• ISSN: 1532-3129
• COBISS.SI-ID: 158982403

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: University of London, Royal Veterinary College, Postgraduate School, Master of Veterinary Medicine