HISTOLOGICAL CLASSIFICATION AND IMMUNOHISTOCHEMICAL EVALUATION OF HORMONAL RECEPTORS, Ki67 AND HER2 AS PROGNOSTIC FACTORS IN CANINE MAMMARY CARCINOMAS

• Grant number: 22/01207-7
• Support Opportunities: Scholarships abroad - Research Internship - Master's degree
• Start date: October 17, 2022
• End date: January 16, 2023
• Field of knowledge: Agronomical Sciences - Veterinary Medicine - Animal Pathology
• Principal Investigator: Ricardo de Francisco Strefezzi
• Grantee: Ingrid Kester Lima Silva
• Supervisor: Adelina Maria Gaspar Gama Quaresma
• Host Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil
• Institution abroad: Universidade de Trás-os-Montes e Alto Douro (UTAD), Portugal
• Associated to the scholarship: 20/14891-8 - EVALUATION OF THE EXPRESSION OF THE PROGRAMMED DEATH CELLULAR LIGAND (PD-L1) AND THE CYTOTOXIC AND REGULATORY T CELL INFILTRATES AS PROGNOSTIC FACTORS IN CANINE MAMMARY TUMORS, BP.MS

Abstract

Cancer has been reported as the leading cause of death in dogs, surpassing infectious diseases. In bitches, mammary tumours are the most common, accounting for about 50% of cases. Canine mammary carcinoma is the one that occurs most frequently, out of a total of 100,000 animals, it affects about 182 bitches annually. The main immunohistochemical prognostic markers evaluated in canine mammary tumours are estrogen (ER) and progesterone (RP) hormone receptors, COX-2, CD31, cell proliferation marker Ki67, epidermal growth factor (EGF), HER2 and TP53. The value of HER2 expression in canine mammary tumours is not fully elucidated, due to the variety of results in the literature. In addition, there are few studies about the use of RE and PR as prognostic factors in mammary tumours in dogs. Studies that better elucidate tumour pathogenesis and aim to improve cancer treatment and prevention are necessary to improve the quality of treatments. The objectives of this Research Internship Abroad Project (BEPE-MS) are: to histologically classify mammary tumours and to evaluate the expression of the biomarkers RE, RP, Ki67 and HER2 in canine mammary carcinomas, in order to complement and compare it with the infiltrates of cytotoxic and regulatory T cells.