HPV e expressão de p16 como biomarcadores de prognóstico em carcinoma de células escamosas da cavidade bucal

• Autor(a) principal: Abreu, Priscila Marinho de
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/1881
• topic: Carcinoma de células escamosas; Biotecnologia; Papilomavírus; Papillomaviridae; Cavidade bucal; Squamous cell carcinoma; Oral cavity; 61

Tumor progression biomarkers are important in determining prognosis and treatment response in squamous cell carcinoma of the oral cavity. This study aimed to evaluate the frequency of HPV infection and p16 expression as a biomarker of prognosis in squamous cell carcinoma of the oral cavity. Clinicopathological data and tumor tissue of 90 patients with squamous cell carcinoma of the oral cavity were obtained by interview and review of medical records. HPV detection was performed starting from tumor tissue samples by PCR using the primer set PGMY09/11. Next, the same samples were subjected to PCR with primers MY09 / 11 primers and nested PCR with GP5+/6+ primers. P16 expression was detected by immunohistochemistry. Statistical analysis was performed using variable association, using the chi-square and Fisher exact test. Disease-specific survival (DSS) and disease-free survival (DFS) were estimated using Kaplan-Meier. Comparison between the survival curves were performed using the log-rank test. Comparison status of HPV infection and p16 expression were analyzed by Cox test. All tests with P≤0,05 were considered significant. The frequency of HPV infection in this population was 3,70% detected only with nested PCR. p16 expression was observed in 21.87% of the analyzed samples. The DSS was 25.5 months (95% CI = 20.03 to 31.00), while the DFS was 30 months (95% CI = 25.63 to 34.48). Most DSS was observed in subjects with initial stage tumors (I-II) (P=0,001), tumor <2 cm (P=0,001), without regional lymph node metastasis (P=0,006) and those undergoing surgical treatment (P<0,0001). In conclusion, the status of HPV infection not proved to be a good prognostic marker and does not seem to be decisive in tumorigenesis in SCC of the oral cavity, since it showed low frequency of infection. The expression of p16 was not a key indicator of the presence of HPV in all samples and a greater number of cases it is necessary to evaluate its applicability as a prognostic marker in this population.