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Previous issue date: 2016-02-26 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / O carcinoma de c?lulas escamosas oral apresenta altas taxas de morbidade e mortalidade na popula??o, com isso, enormes esfor?os est?o sendo feitos para categorizar altera??es morfol?gicas e identificar biomarcadores que tenham valor progn?stico, bem como que estratifiquem os pacientes em op??es terap?uticas individualizadas. Nessa perspectiva, destaca-se o fator do choque t?rmico 1 (HSF1), o qual ? um fator de transcri??o de prote?nas do choque t?rmico (HSPs) que permite ao c?ncer lidar com estressores associados ? malignidade, atuando de diferentes formas na progress?o tumoral. Esta pesquisa objetivou realizar a an?lise clinicopatol?gica de 70 casos de carcinoma de c?lulas escamosas de l?ngua oral (CCELO) e o estudo imunoistoqu?mico dos n?veis de express?o da prote?na HSF1 em CCELO em compara??o com 30 esp?cimes de mucosa oral normal (MON), correlacionando-se, ainda, esta imunoexpress?o com aspectos clinicopatol?gicos do CCELO. Quanto aos casos de CCELO, 57,1% exibiram estadiamento cl?nico III ou IV, 82,9% foram gradados como de alto grau segundo Bryne (1998) e 47,1% como de alto risco de malignidade segundo Brandwein-Gensler et al., (2005). Foi observada uma taxa de sobrevida livre de doen?a de 47,84% e taxa de sobrevida global de 68,20% nos casos analisados e que o alto grau de malignidade segundo a Grada??o de Bryne (1998) (p= 0,05) e tamanho do tumor T3 ou T4 (p= 0,04), recidiva local (p= 0,02) e invas?o perineural (p= 0,02) determinaram impactos negativos nesses tempos de sobrevida. Estes resultados corroboram as informa??es consolidadas na literatura quanto ? influ?ncia negativa de alguns indicadores clinicopatol?gicos na sobrevida dos pacientes com CCELO. Encontrou-se resultado estatisticamente significativo (p<0,01) quando comparou-se a imunoexpress?o de HSF1 entre a MON e o CCELO. Esta significativa maior express?o de HSF1 nos casos de CCELO sugere que esta prote?na atue, de fato, no processo de patog?nese desta les?o. Entretanto, n?o foram encontradas associa??es estatisticamente significativas entre esta superexpress?o com os par?metros cl?nicopatol?gicos analisados. Esse achado pode refletir a influ?ncia de eventos epigen?ticos sobre o gene HSF1 ou uma poss?vel estabilidade da express?o desta prote?na ao longo da progress?o da doen?a. / Squamous cell carcinoma of oral tongue shows high rates of morbidity and mortality in the population, therefore, great efforts are being made to classify morphological changes and identify biomarkers that have prognostic value and that are able to group patients in individualized therapeutic options. From this perspective, there is the heat shock factor 1 (HSF1), which is a heat shock factor transcription protein (HSPs) that allows the cancer to deal with stressors associated with malignancy, acting differently in tumor progression. This research aimed to perform a clinico-pathological analysis of 70 cases of oral tongue squamous cell carcinoma (OTSCC) and immunohistochemical study of the expression of HSF1 protein in OTSCC, comparing it with 30 specimens of normal oral mucosa (NOM), and correlating this immunostaining with clinico-pathological aspects of OTSCC. To analyze the association between immunoexpression of HSF1 and clinicophatoloical aspects, the cases were categorized in minor and major overexpression, based in the median immunostaining score. Regarding the cases of OTSCC, 57.1% showed clinical stage III or IV, 82.9% were graded as high grade according to Bryne (1998) and 47.1% as high risk of malignancy according to Brandwein-Gensler et al., (2005). A disease free survival rate of 47.84% and overall survival rate of 68.20% was observed in the analyzed cases, and the high degree of malignancy according to Bryne?s system (1998) (p=0.05), tumor size T3 or T4 (p=0.04), local recurrence (p=0.02), and perineural invasion (p=0.02) determined negative impacts in survival time. We observed also a statistically significant result (p<0.01) when comparing the immunoreactivity of HSF1 between NOM and OTSCC. This significantly increased expression of HSF1 in cases of OTSCC suggests that this protein acts, indeed, in the pathogenesis of this disease. However, there were no statistically significant associations between this overexpression and the clinico-pathological parameters analyzed. This finding may reflect the influence of epigenetic events on HSF1 gene or a possible stability of this protein expression throughout disease progression.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20957 |
| Date | 26 February 2016 |
| Creators | Silva, Luiz Arthur Barbosa da |
| Contributors | 82134731400, http://lattes.cnpq.br/9634115210679435, Silveira, Ericka Janine Dantas da, 02869049420, http://lattes.cnpq.br/2186658404241838, Godoy, Gustavo Pina, 85762997472, http://lattes.cnpq.br/5655149996985928, Miguel, M?rcia Cristina da Costa |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM PATOLOGIA ORAL, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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