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Argenta FF, de Mello LS, Slaviero M, Cony FG, Bandinelli MB, Pavarini SP, Driemeier D, Sonne L. Pathological and Immunohistochemical Characterization of Thyroid Neoplasms in Cats. J Comp Pathol 2021; 184:44-55. [PMID: 33894877 DOI: 10.1016/j.jcpa.2021.01.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/20/2020] [Accepted: 01/28/2021] [Indexed: 10/22/2022]
Abstract
There are few pathological and immunohistochemical descriptions of thyroid neoplasms in cats. We investigated neoplasms of the thyroid in 31 cats (average age 15.6 years) in Southern Brazil. Most (96.8%) of these cases were classified as follicular adenomas and were predominantly unilateral and multinodular. Histologically, macrofollicular adenomas were the most common type observed. Carcinomas represented 3.2% of the investigated tumours. By immunohistochemical labelling, thyroglobulin was expressed more commonly than paired box gene 8 or thyroid transcription factor 1 in the follicular adenomas. One carcinoma was immunopositive for thyroglobulin, pancytokeratin, chromogranin A and synaptophysin, suggestive of a calcitonin-negative neuroendocrine carcinoma.
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Affiliation(s)
- Fernando F Argenta
- Department of Veterinary Pathology, College of Veterinary Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
| | - Lauren S de Mello
- Department of Veterinary Pathology, College of Veterinary Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Mônica Slaviero
- Department of Veterinary Pathology, College of Veterinary Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Fernanda G Cony
- Department of Veterinary Pathology, College of Veterinary Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Marcele B Bandinelli
- Department of Veterinary Pathology, College of Veterinary Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Saulo P Pavarini
- Department of Veterinary Pathology, College of Veterinary Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - David Driemeier
- Department of Veterinary Pathology, College of Veterinary Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Luciana Sonne
- Department of Veterinary Pathology, College of Veterinary Medicine, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
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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] [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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