Identificação de DNA-HPV tipos 16 e 18 e da expressão de p16INK4 em adenocarcinomas de colo uterino

Abstract

Cervical cancer is one of the most prevalent cancer in women around the world. Cervical adenocarcinoma arises in endocervical mucosal cells and, although HPV is identified in some cases, the pathogenic mechanisms involved in their development are still not understood completely. HPV prevalence in cervical adenocarcinoma varies around the world. HPV 16 and specially HPV 18, are the most frequent types associated with this tumor. The p16INK4, a cell cicle related protein, is superexpressed in many human tumors, including cervical squamous carcinomas. There are findings that correlate this protein with HPV infection. The aim of our study was to identify HPV-DNA and verify the correlation of this findings with the expression of p16INK4 in a series of cervical adenocarcinomas. DNA-HPV analysis was performed by Nested-PCR to HPV 16 and HPV 18 and p16INK4 expression was verified by immunohistochemistry. HPV 16 was the most frequent type in our series (51,4%) followed by HPV 18 (28,6%). Coinfection (HPV16 and HPV 18) was found in 5,7%. A very strong expression of p16INK4 was found in association with HPV-DNA positivity.