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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

Avaliação clínica, histopatológica e imuno-histoquímica de 48 casos de queilite actínica

Piccelli, Hilton Rinaldo Salles 19 May 2008 (has links)
Made available in DSpace on 2016-08-10T10:39:18Z (GMT). No. of bitstreams: 1 Hilton Rinaldo Salles Piccelli.pdf: 1013428 bytes, checksum: 900904fd782b76c7a9b8862f4b21bc9e (MD5) Previous issue date: 2008-05-19 / Actinic cheilits (AC) is a premalignant lesion of the lip. In general, patients with actinic cheilitis present with no symptoms and clinical signs do not reflect the hystopathological severity of the lesion, allowing its evolution to invasive cancer. Prognostic indicators for evolution of such lesions have been investigated by different groups, including the detection of alterations in the TP53 gene. A series of 48 patients with actinic cheilitis is evaluated in this study. Clinical signs, histopathological features and imunohistochemistry detection of the p53 protein were evaluated in this group. All the patients were caucasian and 44% had a previous history of non-melanoma skin cancer in another site of the body. The most frequent clinical signs observed in the patients included loss of lip vermilion (75%), pelling of the lip (71%) and atrophy (67%). Eighty-five per cent of the patients did not present, on the first consultation, specific complaints related to actinic cheilitis. Histopathological analysis described dyskeratosis in 95% of the samples, epithelial hyperplasia in 85% and dysplasia in 57% of the cases. munodetection of p53 on the suprabasal layer was diffuse in 8 patients. Among hem, 12% of the samples showed dyskeratosis, 87% hyperplasia and 100% presented epithelium dysplasia. The diffuse imunodetection of the p53 protein on he suprabasal layer correlated positively with the presence of epithelial dysplasia (p many 0,005). According to different reports, dysplasia is the most significant prognostic factor to the evolution of actinic cheilitis to squamous cell carcinoma of he lip. We here suggest that the imunodetection of p53 on the suprabasal layer of actinic cheilitis samples might also represent an important prognostic factor to such premalignant lesions. / A queilite actinica (QA) é uma lesão pré-maligna do lábio. Em geral, os pacientes são assintomáticos e os sinais clínicos não refletem a gravidade histopatológica da lesão, permitindo sua evolução para o câncer invasor. Marcadores prognósticos para esta evolução têm sido investigados, incluindo a detecção de alterações no gene TP53. Uma série de 48 pacientes com QA é avaliada neste estudo. Sinais clínicos, aspectos histopatológicos e a imunodetecção da proteína p53 foram avaliados no grupo. Todos os pacientes eram brancos e 44% apresentaram história prévia de câncer de pele tipo não- melanoma em outro sítio corporal. Os sinais clínicos mais freqüentes incluíram perda do vermelhão do lábio (75%), descamação (71%) e atrofia (67%). À primeira consulta, 85% dos pacientes não apresentavam queixas específicas relacionadas à QA. No exame histopatológico, verificou-se disceratose em 95% dos casos, hiperplasia epitelial em 85% e displasia em 57% dos casos. A imunodetecção de p53 foi difusa e mais intensa na camada suprabasal em 8 pacientes. Dentre eles, 12% apresentavam disceratose, 87% hiperplasia e 100% apresentavam displasia do epitélio (p menor que 0,005). A imunodetecção difusa da proteína p53 na camada suprabasal correlacionou-se positivamente com a presença de displasia epitelial. De acordo com a literatura, a displasia representa o fator prognóstico mais significativo para a evolução da QA para carcinoma do lábio. Assim, sugerimos que a imunodetecção de p53 na camada suprabasal represente também um fator prognóstico para a queilite actínica.

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