Avaliação da expressão de P16INK4A em carcinomas de colo uterino

• Ano de defesa: 2016
• Autor(a) principal: Nogueira, Nathalia Amaral
• Orientador(a): Saddi, Vera Aparecida
• Banca de defesa: Rodrigues, Flávia Melo , Carneiro, Megmar Aparecida dos Santos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontifícia Universidade Católica de Goiás
• Programa de Pós-Graduação: Genética
• Departamento: Ciências Humanas
• País: BR
• Palavras-chave em Português: Câncer de colo uterino; p16INK4a; prognóstico
• Palavras-chave em Inglês: uterine cervical cancer; p16INK4a; prognosis
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::GENETICA
• Link de acesso: https://tede2.pucgoias.edu.br/handle/tede/2403

In developing countries, uterine cervical cancer is responsible for a large percentage of deaths in middle-aged women, and presents high rates of incidence, especially due to the lack of efficient screening of precursor lesions and cancer. Biomarkers can increase the accuracy and effectiveness of screening programs, diagnosis and treatment of cervical cancer precursor lesions. Among the markers related to cell proliferation changes, p16INK4a excels. P16INK4aexpression may suggest the presence of transformed cells, in the lesions seemingly normal morphology, and it also predicts the faster development of neoplastic cells. The prognostic role of p16INK4a in cervical cancer is not clear. The effect of p16INK4a expression in the survival of cervical cancer patients has been investigated and the results are conflicting. The main objective of this study was to investigate the potential prognostic role of p16INK4a in cervical carcinomas. The series comprising 161 patients attended on Araújo Jorge Hospital - Goiânia, Goiás, Brazil - from 2006 to 2007, with histologically confirmed cervical cancer, assessed for p16INK4a expression by means of immunohistochemistry. The results were compared by Chi-square test or Fisher s exact test and survival analysis by Kaplan-Meier and Log-rank tests. Overexpression of p16INK4a was observed in 145 (90.0%) of the cases. No statistically significant association was observed between p16INK4a expression and clinical pathological aspects of cervical carcinomas. The overall survival for the group was 69.0%. When survival was evaluated in relation to p16INK4a expression, cases with overexpression showed a better survival rate (70.3%), towards those with low expression (56.2%), despite the difference between groups was not statistically significant. When compared in relation to clinical staging, cases with stage I and II showed a better survival (71.9%), compared to those with stage III and IV (54.8%) (p= 0.04), translating the best prognosis of cases diagnosed ealier. Our results do not confirm the association between the p16INK4a expression and prognosis of uterine cervical cancer.