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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

Detecção de HPV e avaliação do índice de proliferação celular entre carcinomas espinocelulares e carcinomas verrucosos de boca / HPV detection and evaluation of the index of cell proliferation between squamous cell carcinoma and verrucous carcinoma of the mouth

SPÍNDULA FILHO, José Vieira de 27 November 2006 (has links)
Made available in DSpace on 2014-07-29T15:21:56Z (GMT). No. of bitstreams: 1 DIS J V S FILHO 2006.pdf: 804840 bytes, checksum: 74be1a5db70d292dc48c7621acb661f3 (MD5) Previous issue date: 2006-11-27 / Squamous cell carcinoma (SCC) is the most common malignant neoplasm of the bucal cavity, and one of its variants is verrucous carcinoma (VC), of low degree malignancy. The diagnosis of VC is difficult from the clinical as well as from the histopathological point of view, and an effective diagnosis is vital when deciding on the treatment and prognosis of this tumor. The aim of this research was to evaluate cell proliferation and investigate the presence of HPV in spindle cell carcinoma of the mouth so as to check for possible differences in the aetiopathogenesis and biological behavior of these lesions. Forty-seven samples were selected and divided as follows: 39 SCCs, 8 VCs and 9 control (CT). Cell proliferation was qualitatively evaluated according to the location of the expression of the immunomarker in the cell and epithelium layers and by quantitatively considering the percentage of positive cells expressed. The analysis of HPV+ carcinomas was undertaken by means of the polymerase chain reaction (PCR), having GP5+/6+ as primers for identification of the virus. The qualitative analysis showed that the immunomarking in the VC as well as in the control group was concentrated mainly in the basal and parabasal layers and the counting of the positive cells at the base of the epithelium showed a significant statistical difference in the expressions of all three markers (p<0,05). The quantitative analysis of the cell proliferation markers was calculated by means of the Mann-Whitney and Kruskal Wallis tests and through the Pearson and Spermans correlation. They pointed to differences between the SCC and VC groups for the PCNA and cyclin B1 markers (p<0,05). On considering the three groups, it was proved that there was a positive correlation between Ki67 and the cyclin B1 (r=0,56) but not between the PCNA and the Ki67. The PCNA immunomarking was greater in the control group (average=100%), and the Ki67 showed itself to be effective as a proliferation cell marker although it showed no significant difference between the carcinoma variants. Whereas the cyclin B1 showed a significant difference in the comparison between the SCC and the VC groups (p<0,05), and a positive correlation to the extent that the histological grading of the malignancy (WHO model) of the carcinomas increased (r=0,44). All tumor samples were negative for HPV. Although the lesions showed different biological behaviors, the cell proliferation index in both types of mouth carcinoma was higher than in the control group, as shown by the analysis of the Ki67 and cyclin B1 markers. On considering the total sample of carcinomas, independently of the tumor variety, cyclin B1 showed a positive correlation with the histological degree of malignancy according to WHO. There is a need for further study to be carried out in the field of cell proliferation and detection of HPV especially with regard to VC, because it is a rare variant of SCC. / O carcinoma espinocelular (CEC) é a neoplasia maligna mais comum na cavidade bucal, e uma de suas variantes é o carcinoma verrucoso (CV), considerado de baixo grau de malignidade. O diagnóstico do CV é difícil, tanto do ponto de vista clínico quanto histopatológico e um efetivo diagnóstico é fundamental para estabelecer o tratamento e o prognóstico desse tumor. Neste estudo foi avaliada a proliferação celular e investigada a presença de HPV em carcinomas espinocelulares de boca com intuito de verificar possíveis diferenças na etiopatogênese e comportamento biológico destas lesões. Foram selecionadas 47 amostras de CEC assim distribuídas: 39 CECs, 8 CVs e 9 controles (CT). A proliferação celular foi avaliada qualitativamente de acordo com a localização da expressão do imunomarcador na célula e nas camadas do epitélio e quantitativamente considerando o percentual de células positivas expressas. A análise de carcinomas HPV+ foi realizada por meio da reação em cadeia da polimerase (PCR), tendo como primers GP5+/6+ na identificação do vírus. A análise qualitativa revelou que a imunomarcação tanto no CV como no controle concentrava se principalmente nas camadas basal e parabasal e a contagem das células positivas na base do epitélio mostraram diferença estatisticamente significativa na expressão dos três marcadores (p<0,05). A análise quantitativa dos marcadores de proliferação celular foi calculada pelos testes estatísticos Mann-Whitney, Kruskal Wallis, correlação de Pearson e Spermans, que revelaram diferenças entre o grupo CEC e CV para os marcadores PCNA e ciclina B1 (p<0,05). Considerando os três grupos, verificou-se correlação positiva entre Ki67 e a ciclina B1 (r=0,56) e inexistência de correlação entre o PCNA e Ki67. A imunomarcação do PCNA foi maior no grupo controle (média=100%), e o Ki67, mostrou-se efetivo como marcador de proliferação celular, entretanto, não mostrou diferença significativa entre as variantes de carcinomas. Já a ciclina B1 apresentou diferença significativa na comparação entre o grupo CEC e o grupo CV (p<0,05) e correlação positiva na medida em que a gradação histológica de malignidade (padrão OMS) dos carcinomas aumentava (r=0,44). Todas as amostras de tumores foram negativas para o HPV. Embora as lesões apresentem comportamento biológico diferente, o índice de proliferação celular nos dois tipos de carcinomas de boca mostrou ser superior ao do grupo controle, por meio da análise dos marcadores Ki67 e ciclina B1. Quando considerada a amostra total de carcinomas, independente da variante tumoral, a ciclina B1 mostrou correlação positiva com o grau histológico de malignidade segundo a OMS. Há necessidade que mais estudos possam ser empreendidos na área de proliferação celular e detecção de HPV em especial com relação ao CV, por se tratar de uma variante rara do CEC.

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