Propostas terapêuticas para o mastocitoma canino baseadas em fatores prognósticos clínicos, anátomo-patológicos, imuno-histoquímicos e genéticos

Detalhes bibliográficos
Ano de defesa: 2016
Autor(a) principal: Rodrigo dos Santos Horta
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Minas Gerais
UFMG
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/1843/SMOC-A79G7U
Resumo: The objective of this thesis was to evaluate the effectiveness of prognostic factors and different therapeutic approaches towards canine mast cell tumour, considering its high incidence and heterogeneity in clinical presentation and biological behavior, representing a guideline for prognosis and treatment. It included dogs referred to the Veterinary Hospital (Universidade Federal de Minas Gerais, Brazil) and Queen's Veterinary School Hospital (University of Cambridge, United Kingdom), with histological diagnosis of mast cell tumour. Evaluated prognostic factors included clinical, histological, immunohistochemical and genetic features, resulting in five distinct studies. Study 1 (n = 62) demonstrated high response rate to glucocorticoids (64.5%) in the treatment of measurable disease, and showed a negative impact on prognosis in the absence of response to these drugs. In study 2 (n = 149), the importance of different prognostic factors was evaluated, with a proposal of a modification for the World Health Organization´s recommended clinical staging, definition of new cut-off values for mitotic index and Ki-67. Study 3 (n = 98) showed the benefit of chemotherapy at maximum tolerated dose, in the control of high-risk mast cell tumours, while the study 4 (n = 21) demonstrated a high efficacy of adjuvant radiotherapy in the long-term control, of mast cell tumours of intermediate risk. Finally, it was demonstrated in the study 5 (n = 31), the effectiveness of tyrosine kinase inhibitors in patients at high risk, in the treatment of gross, unresectable disease, but also in the adjuvant setting, although the use of glucocorticoids and antineoplastic agents may compromise such response.