Resposta do linfoma cutâneo canino à lomustina: achados clínicos, imunohistoquímicos e expressão gênica

• Ano de defesa: 2013
• Autor(a) principal: Duarte, Amanda Resende [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Cancer em cão; Apoptose; Expressão gênica; Linfoma - Quimioterapia; Pele - Cancer; Celulas - Proliferação; Skin Cancer
• Link de acesso: http://hdl.handle.net/11449/108626

The cutaneous lymphoma is an uncommon neoplastic skin disease in dogs, with decreased survival length, poor response to chemotherapy and poor prognosis. This study aimed to: 1) evaluate clinical and laboratory animals treated with lomustine; 2) establish the immunophenotype and the degree of cell proliferation and apoptosis in cutaneous lymphoma; 3) determine the level of gene expression of MDR – 1; 4) Correlate those variables to the rates of clinical response to therapy and survival. Fifteen dogs with histopathological diagnosis of cutaneous lymphoma were evaluated and treated with lomustine at a dose of 90 mg/m2 every 21 days. After chemotherapy, 53.3 % (8/15) of the animals showed partial remission and 7 dogs (46.6 %) did not respond to the treatment. The average survival time was considered short (59.3 days). The major hematological and biochemical changes observed during therapy were anemia (46.1%), leukopenia (73.3%) and thrombocytopenia (60 %). Kidney and liver toxicity was observed in 40% and 73.3 % of animals, respectively. Most of the samples (93.3 %) presented elevated rates of cell proliferation and 100% presented low apoptotic index. The majority of the animals (93.3 %) expressed MDR-1 gene in tumor cells at the moment of diagnosis, with levels of expression varying considerably. The results obtained in this work suggest that treatment with lomustine should be monitored, as its deleterious effects were demonstrated in dogs. The immunohistochemical evaluation and the gene expression confirm the aggressive biological behavior and low life expectancy, although there was no correlation between the assessed variables and the animals' survival length