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Soares LMC, Pereira AHB, de Campos CG, Rocha LS, Dos Santos TÁ, Souza MA, Jark PC, Pescador CA. Histopathological and Immunohistochemical Characteristics of Thyroid Carcinoma in the Dog. J Comp Pathol 2020; 177:34-41. [PMID: 32505238 DOI: 10.1016/j.jcpa.2020.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 03/29/2020] [Accepted: 04/08/2020] [Indexed: 11/17/2022]
Abstract
Thyroid carcinomas are a common form of endocrine neoplasia in dogs. In the present study, we combined histopathology with immunohistochemistry (IHC) to search for the presence of oestrogen receptor alpha (ORα), Cox-2 and Ki67 in canine thyroid carcinomas. Forty-eight thyroid carcinomas were diagnosed throughout the study period. Thyroglobulin and calcitonin IHC distinguished between thyroid tumours with a follicular and medullary (C-cell) origin, respectively. IHC-based diagnosis showed that 42 (87.50%) of the cases were follicular cell carcinoma. In these cases, the follicular-compact pattern was the most frequent (n = 20/42; 47.62%) and six cases (12.5%) were medullary cell (C-cell) carcinomas. Both medullary (C-cell) and follicular carcinomas expressed Ki67 and Cox-2. No differences were observed between medullary and follicular carcinomas with respect to expression of Ki67 (P = 0.34) and Cox-2 (P = 0.9523) markers. A total of 4.17% (n = 2/48) of thyroid carcinomas showed positive nuclear labelling for ORα, suggesting that oestrogen does not directly participate in the pathogenesis of canine thyroid neoplasia.
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Affiliation(s)
- L M C Soares
- Laboratory of Veterinary Pathology, Federal University of Mato Grosso, Bairro Boa Esperança, Cuiabá, Mato Grosso, Brazil
| | - A H B Pereira
- Laboratory of Veterinary Pathology, Federal University of Mato Grosso, Bairro Boa Esperança, Cuiabá, Mato Grosso, Brazil
| | - C G de Campos
- Laboratory of Veterinary Pathology, Federal University of Mato Grosso, Bairro Boa Esperança, Cuiabá, Mato Grosso, Brazil
| | - L S Rocha
- Laboratory of Veterinary Pathology, Federal University of Mato Grosso, Bairro Boa Esperança, Cuiabá, Mato Grosso, Brazil
| | - T Á Dos Santos
- Laboratory of Veterinary Pathology, Federal University of Mato Grosso, Bairro Boa Esperança, Cuiabá, Mato Grosso, Brazil
| | - M A Souza
- Laboratory of Veterinary Pathology, Federal University of Mato Grosso, Bairro Boa Esperança, Cuiabá, Mato Grosso, Brazil
| | - P C Jark
- Department of Medical Clinics, University of Brazil, Fernandópolis, São Paulo, Brazil
| | - C A Pescador
- Laboratory of Veterinary Pathology, Federal University of Mato Grosso, Bairro Boa Esperança, Cuiabá, Mato Grosso, Brazil.
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