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Master's Dissertation
DOI
https://doi.org/10.11606/D.17.2009.tde-18112010-132415
Document
Author
Full name
Fabiana Alves Miranda de Camargo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2009
Supervisor
Committee
Soares, Edson Garcia (President)
Garcia, Sergio Britto
Soares, Christiane Pienna
Title in Portuguese
Avaliação da progressão tumoral do câncer de laringe associada à infecção pelo Papilomavírus Humano (HPV)
Keywords in Portuguese
bcl-2
carcinoma de laringe
Galectina-3
HPV
imunoistoquímica
PARP-1
PCR
Abstract in Portuguese
Para que ocorra a transição do epitélio normal de laringe para carcinoma escamoso é necessário um processo de múltiplas etapas tal como exposição prolongada ao fumo e álcool e uma possível associação à infecção pelo HPV. Vários tipos de marcadores moleculares vêm sendo estudados na carcinogênese da laringe, entre eles proteínas associadas a apoptose (bcl-2 e PARP-1) assim como proteínas envolvidas em múltiplos processos biológicos como a Galectina-3. Neste estudo foram realizadas análise imunoistoquímica quantitativa e qualitativa para bcl-2, PARP-1 e galectina-3 em 65 pacientes diagnosticados com câncer de laringe subdivididos em: carcinoma de laringe in situ (CLIS), carcinoma de laringe com metástase (CLM), sem metástase (CLS) e linfonodos cervicais (LC). A detecção e tipificação do HPV foram realizadas pela reação em cadeia da polimerase (PCR) e os tipos de HPV avaliados foram HPV 6, 11, 16, 18, 31 e 33. Na avaliação quantitativa de galectina-3 observou-se um significativo aumento de expressão no carcinoma invasivo de laringe (CLS e CLM) quando comparado com carcinoma in situ (CLIS), podendo concluir que essa proteína seria um bom marcador pra progressão de câncer de laringe. Para as proteínas PARP-1 e bcl-2 não houve diferença nos níveis de expressão nos grupos analisados. Na análise qualitativa PARP-1 apresentou uma homogeneidade de marcação tanto alta como baixa entre os grupos. Em relação à Galectina-3 observou-se um predomínio de casos com alta expressão, diferentemente da proteína bcl-2 onde o predomínio foi de baixa expressão em todos os casos de carcinoma de laringe e seus respectivos linfonodos metastáticos. Dos 65 pacientes, 55 (84,6%), foram positivos para beta-globina e 7 (12.7%) dos 55 pacientes foram positivos para HPV. Não foi possível verificar quaisquer correlações entre as proteínas Galectina-3, bcl-2 e PARP-1 e o HPV devido ao baixo índice de casos positivos.
Title in English
Evaluation of tumor progression in laryngeal carcinoma associated with human Papilomavirus (HPV) infection.
Keywords in English
bcl-2
Galectin-3
HPV
immunohistochemistry
laryngeal carcinoma
PARP-1
PCR
Abstract in English
To occur the transition from normal epithelium to squamous cell carcinoma is a necessary a for multiple stages process, such as smoking and alcohol abuse and a possible association with HPV infection. Several types of molecular markers have been studied in cancer of larynx, including proteins associated with apoptosis (bcl-2 and PARP-1) and proteins involved in many biological process such as galectin-3. In this study, analyses of qualitative and quantitative immunohistochemistry was performed for bcl-2, PARP-1 and galectin-3 in 65 patients diagnosed with laryngeal squamous cell carcinoma divided into in situ laryngeal carcinomas(LSCCS), laryngeal squamols cells carcinomas without metastases (LSCCWT) and with metastasis (LSCCW) and cervical lymph nodes (CL). HPV detection and typing was performed by PCR and the HPV types evaluated were HPV 6, 11, 16, 18, 31 and 33. In quantitative of galectin-3 there was observed a significant increase of expression in invasive laryngeal squamous cell carcinoma (LSCCWT and LSCCW) compared with in situ laryngeal carcinomas (LSCCS), may indicating that this protein could be a good marker for progression of laryngeal carcinoma. For PARP-1 and bcl-2 protein there was no difference in the levels of expression in all groups studied. In qualitative analysis PARP-1 showed a homogenous immunolabeling in both high and low among the groups. In relation to Galectin-3, it was observed a predominance of cases with high expression, unlike the protein bcl-2 where the expression prevalence was low in all cases of laryngeal carcinoma and their metastatic lymph nodes. Of the 65 patients, 55 (84.6%) were positive for beta-globin and 7 (12.7%) of 55 patients were positive for HPV. Because of a low incidence of HPV in the cases studied, it was not possible correlate the proteins bcl-2, PARP-1 and Galectin-3 with the presence of HPV.
 
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Publishing Date
2010-12-13
 
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