Análise imuno-histoquímica da via WNT em neoplasias epiteliais ovarianas e ovários normais

• Ano de defesa: 2009
• Autor(a) principal: Badiglian Filho, Levon [UNIFESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo (UNIFESP)
• Palavras-chave em Português: Ovário; Neoplasias ovarianas; Proteínas WNT; Beta-catenina; WNT5A
• Link de acesso: http://repositorio.unifesp.br/handle/11600/8936

Objectives: To analize the canonical and noncanonical Wnt pathway in normal ovary, benign ovarian tumor and ovarian cancer. Methods: Ovarian specimens were obtained from surgeries performed between 1993 and 2004. The patients were divided in three groups: Group A, epithelial ovarian cancer (N = 38); Group B, benign epithelial neoplasia (N = 27) and Group C, normal ovaries (N = 26). Immunoreactivity for Wnt1, FZD1, Wnt5a, FZD5 and -catenin was scored for each group. Results: The proportion of Wnt1 positive women at the group A (29.4%) was significantly higher than the group B (4.3%) and C (9.1%) (p = 0.020). The proportion of FZD1 positive patients in group C (54.5%) was significantly lower than the group A (97.1%) and B (90.0%) (p < 0.001). The proportion of Wnt5a positive women was significantly higher for group A (80.0%) compared to the group B (25.0%) and C (27.3%) (p<0.001). The proportion of ß-catenin positive patients in the group C (95.8%) was significantly higher than the group B (52.4%) (p = 0.004). Comparison of the survival curves in group A according to Wnt5a expression showed a significant difference between positive and negative patients, whereas the Wnt5a positive women showed worse results (p=0.050). Conclusion: Our findings suggest that the pathways related to Wnt5a have an important role in ovarian malignant neoplasia. Furthermore, Wnt5a was found to be a predictor of poor prognosis for ovarian cancer.