Prostaglandina E2 em cães portadores de linfoma multicêntrico submetidos ao protocolo quimioterápico de Madison-Wisconsin associado ou não a um inibidor de COX-2

• Autor(a) principal: Miotto, Mariana Rodrigues [UNESP]
• Data de Publicação: 2014
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/122029
• topic: Cão - Doenças; Cancer em cão; Linfoma; Oncologia veterinaria; Quimioterapia veterinaria; Prostaglandinas; Lymphoma

Considering the relevance of canine lymphoma in veterinary medicine and the short survival achieved with chemotherapy protocols employed, new treatment options are being studied. In the last decades, various studies have been conducted to correlate the development and progression of certain types of cancer with the overproduction of prostaglandins in tumor sites and inflammatory cells, due to increased production of COX-2, leading to cell proliferation, the suppression of apoptosis , the induction of angiogenesis and metastasis, these actions that count toward their oncogenic function. One strategy for reducing the levels of PGE2 is the use of COX-2 in anticancer treatment. In this study 20 dogs with diagnosis of multicentric lymphoma, divided in two groups were evaluated. Animals in group 1 were treated with the standard Madison-Wisconsin chemotherapy protocol, and group 2, with this protocol modified by the replacement of prednisone for a selective inhibitor of COX-2. Before the first (T1) and fifth (T2) chemo, blood samples and measurement of plasma PGE2 by ELISA were performed. We observed a higher number of female animals, Rottweiler breeds and mixed breed, middle age animals, who presented with greater frequency, multicentric lymphoma in stage IVa, B cell origin, and diffuse large cell. Leukocytosis with neutrophilia or lymphocytosis was observed for some animals at the moment of diagnosis, and after the first cycle of chemotherapy, seven cases of lymphopenia. Dogs with clinical signs of remission after the first cycle of chemotherapy show lower plasma PGE2 when compared with those without remission. The association of chemotherapy treatment with a COX-2 was able to reduce concentrations of PGE2 in 50% of patients, while only 10% of those in group 1 decreased. However, it was not possible to confirme the role of PGE2 as a marker of prognosis and survival time for dogs with lymphoma