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Vet. Sci. 2019, 6(1), 3; https://doi.org/10.3390/vetsci6010003

Deregulation of VEGFR-2 and PDGFR Expression and Microvascular Density in a Triple-Negative Model of Canine Malignant Mammary Tumors with Lymph Node or Lung Metastasis

1
Veterinary Science Graduate Program, University of Franca (UNIFRAN), Franca 14404-600, Brazil
2
Department of Veterinary Surgery and Anesthesiology, School of Veterinary Medicine and Animal Science, São Paulo State University—UNESP, Botucatu 18618-681, Brazil
3
Superintendencia Unidade Hospitalar Veterinaria Universitaria, Federal University of the Fronteira Sul, Realeza 85770-000, Brazil
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 9 December 2018 / Revised: 2 January 2019 / Accepted: 3 January 2019 / Published: 9 January 2019
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Abstract

Canine mammary tumors (CMT) represent the most common cancer in noncastrated female dogs. Interestingly, triple-negative tumors are the most common molecular subtype in female dogs. In this study, we proposed to evaluate the expression of vascular endothelial growth factor receptor 2 (VEGFR-2), Platelet-derived growth factor receptor (PDGFR), and microvascular density (MVD) in a group of metastatic and nonmetastatic triple-negative CMT and compare the expression based on clinical parameters. Twenty-six female dogs with triple-negative mammary tumors were divided into three groups: nonmetastatic tumors (NMT) (n = 11), tumors with lymph node metastasis (LNM) (n = 10), and tumors with lung metastasis (LM) (n = 5). We observed increased VEGFR-2 expression in LNM compared with NMT and a positive correlation between tumor grade and VEGFR-2 expression. A positive correlation was noted between VEGFR-2 and PDGFR expression. Regarding microvascular density (MVD), we identified a higher number of vessels in primary tumors with lymph node metastasis and lung metastasis compared with tumors with no metastasis. The primary tumors with lung metastasis exhibited an increased MVD compared with carcinoma with lymph node metastasis. Overall, our results suggest a deregulation of VEGFR-2 and PDGFR and high MVD in metastatic tumors, indicating a role for angiogenesis in tumor progression. View Full-Text
Keywords: angiogenesis; metastasis; mammary neoplasm angiogenesis; metastasis; mammary neoplasm
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Dos Anjos, D.S.; Vital, A.F.; Lainetti, P.F.; Leis-Filho, A.F.; Dalmolin, F.; Elias, F.; Calazans, S.G.; Fonseca-Alves, C.E. Deregulation of VEGFR-2 and PDGFR Expression and Microvascular Density in a Triple-Negative Model of Canine Malignant Mammary Tumors with Lymph Node or Lung Metastasis. Vet. Sci. 2019, 6, 3.

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