Histomorphological and immunophenotypic diagnoses of gastrointestinal stromal tumors and other sarcomas that affect the intestine of dogs

Marina Laudares Costa; Felipe Augusto Ruiz Sueiro; Paulo César Jark; Leonardo Lamarca de Carvalho; Marcela Aldrovani Rodrigues; Vinícius Thomaz da Silva Almeida; Fernanda Gosuen Gonçalves Dias

doi:10.1590/1809-6891v24e-75610E

Authors

Marina Laudares Costa Universidade de Franca (UNIFRAN), Franca, São Paulo, Brasil https://orcid.org/0000-0002-3895-3523
Felipe Augusto Ruiz Sueiro VETPAT Laboratório de Análises Clínicas, Campinas, SP, Brasil https://orcid.org/0000-0001-8524-479X
Paulo César Jark Serviço de Oncologia Oncospes, Ribeirão Preto, São Paulo, Brasil https://orcid.org/0000-0001-7042-7235
Leonardo Lamarca de Carvalho Universidade de Franca (UNIFRAN), Franca, São Paulo, Brasil https://orcid.org/0000-0002-3730-2964
Marcela Aldrovani Rodrigues Universidade de Franca (UNIFRAN), Franca, São Paulo, Brasil https://orcid.org/0000-0002-5734-3042
Vinícius Thomaz da Silva Almeida Universidade de Franca (UNIFRAN), Franca, São Paulo, Brasil https://orcid.org/0000-0003-4030-5864
Fernanda Gosuen Gonçalves Dias Universidade de Franca (UNIFRAN), Franca, São Paulo, Brasil https://orcid.org/0000-0001-6072-4789

DOI:

https://doi.org/10.1590/1809-6891v24e-75610E

Abstract

In view of the morphological similarity between gastrointestinal stromal tumors (GIST) and other sarcomas of the intestine of dogs, the aim was to carry out the histomorphological and immunohistochemical diagnosis of these tumors, associating breed, sex and age, location and tumor invasion. 217 cases were evaluated by histopathology and 36 diagnosed by immunohistochemistry were included (24 GIST and 12 other intestinal sarcomas). Mixed breed dogs were the most diagnosed with GIST, mainly elderly females (9.5±2.2 years); in the other intestinal sarcomas, crossbreeds and Dachshunds, males and females, were equally affected. The cecum was the most affected by GISTs, with tumor invasion of the intestinal layers in all cases. The small intestine was the most affected by the other intestinal sarcomas, with invasion of the layers in most of these tumors. GISTs expressed markers such as CD117 and DOG-1, unlike other intestinal sarcomas. GIST and other intestinal sarcomas denoted histomorphological and immunophenotypic characteristics similar to histopathology, justifying the association of immunohistochemistry for the definitive diagnosis.
Keywords: CD117; DOG-1; GIST; veterinary oncology

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