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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Imunoexpressão das proteínas Catepsina B e E-caderina nas leucoplasias de prega vocal: correlação clínica, epidemiológica e histopatológica / Immunoexpression of Cathepsin B and E-cadherin in leukoplakia vocal cord: correlation to clinical, epidemiological and histophatologic

Amorim Filho, Francisco de Souza [UNIFESP] 25 August 2010 (has links) (PDF)
Made available in DSpace on 2015-07-22T20:50:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-08-25 / Introdução: A identificação precoce da leucoplasia de prega vocal com risco de evoluir para malignidade é um assunto controverso e de difícil diagnóstico. Com a descoberta de marcadores biológicos capazes de identificar precocemente estas lesões, ter-se-iam melhores condições de realizar um tratamento mais efetivo precocemente. Objetivo: Analisar a imunoexpressão das proteínas Catepsina-B e Ecaderina nas leucoplasias de prega vocal e correlacioná-las com os dados clínicos, epidemiológicos e prognóstico da doença. Método: Foram avaliados, retrospectivamente, 32 pacientes portadores de leucoplasia de pregas vocais, tratados por cirurgia no período de 2000 a 2004. Os pacientes foram distribuídos de acordo com os resultados histológicos em dois grupos: Grupo A - Baixo Grau, n=16 e Grupo B - Alto Grau, n=16. As expressões quantitativas dos marcadores foram avaliadas, segundo a intensidade da sua coloração e distribuição tecidual, pelo programa de processamento de imagens-ImageLab®. O índice de expressão (IE) de cada marcador foi correlacionado com os hábitos de vida dos pacientes - uso de tabaco e bebida alcoólica -, sinais da síndrome faringolaríngea do refluxo e recidiva local da lesão. Resultados:Na análise estatística comparando o IE dos marcadores entre os grupos (A e B) separadamente, os pacientes com recidiva local do Grupo B - apresentaram maior IE para Catepsina-B. Na análise do IE dos marcadores entre todos os pacientes (A + B), o IE da Catepsina-B foi maior entre os fumantes e os que não apresentavam sinais sugestivos de refluxo,e o IE da E-caderina foi maior nos pacientes com recidiva local. Conclusão: Os pacientes com displasia moderada, severa e carcinoma in situ, com elevado IE de Catepsina-B e que tenham o hábito do tabagismo estão mais propensos à recidiva local, e aqueles com sinais sugestivos da síndrome faringolaríngea do refluxo apresentam índices de expressão mais baixo de Catepsina-B, independente da lesão histológica. O aumento no índice da expressão para Catepsina-B no grupo com lesões de alto grau aponta esta proteína como potencial marcador de recidiva para as lesões leucoplásicas da prega vocal. O índice de expressão da E-caderina encontra-se aumentado entre os pacientes com Leucoplasia de prega vocal que recidivaram após tratamento inicial. / Introduction: Early identification of vocal fold leukoplakia with risk for malignancy is a controversial subject and difficult in terms of diagnosis. Histological changes that may predispose to this irreversible malignant transformation remain as undefined lesions in the larynx. With the analysis of immunohistochemical parameters and the discovery of a biological marker able to identify these early lesions, a more effective early treatment can be provided, which can result in the preservation of phonatory organ. Objective: To analyze the immunohistochemical protein expression of cathepsin B-and ECadherin in leukoplakia of the vocal fold and correlate them with clinical data, epidemiology and prognosis of the disease. Method: We retrospectively evaluated 32 patients with leukoplakia of the vocal folds in the Institute of Larynx- city of Sao Paulo- diagnosed through laryngoscopy and treated with surgery during 2000 to 2004. Patients were divided into two groups according to histological results, Group A (Low Grade, n = 16) and Group B (High Grade, n = 16). Slides added by anti-cathepsin-B and anti-E-cadherin were obtained from paraffin blocks for subsequent reading of markers through Imagna- ImageLab processing. The quantitative expression of cathepsin B-and Ecadherin was evaluated according to the coloration intensity and tissue distribution. The expression index (EI) of each marker was correlated to patient´s lifestyle (use of tobacco and alcohol), signs of gastroesophageal reflux disease and local recurrence of the lesion in two separate groups and among all patients. Results: In the descriptive analysis, the vocal fold leukoplakia showed more intensity in men who had frequent habit of smoking and alcohol consumption. These patients had high levels suggestive of signs of gastroesophageal reflux disease and local recurrence of the lesion after initial treatment. Statistical analysis comparing the levels of expression (IE) of the markers between the groups (A and B), patients with local recurrence in Group B (High Grade) had higher IE for cathepsin-B. In the statistical analysis of IE markers among all patients without histological differentiation, the IE of cathepsin-B was higher among smokers and those with no signs suggestive of reflux. In the same analysis, E-cadherin was higher in all patients with local recurrence. Conclusion: Smoking patients who have moderate or severe dysplasia, carcinoma in situ and high levels of cathepsin-B were more susceptible to local recurrence of disease. Those with signs suggestive of gastroesophageal reflux disease had lower IE of cathepsin-B, independent of histologic differentiation. The increase in cathepsin-B expression, for high grade lesions group, indicates this protein as a possible marker of aggressiveness to leukoplastic vocal cord lesions. The rate of expression of Ecadherin is shown as a potential marker for recurrence of leukoplastic vocal fold lesions. / TEDE / BV UNIFESP: Teses e dissertações

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