Associação entre Chlamydia trachomatis e HPV com a gravidade da neoplasia cervical

• Autor(a) principal: Segati, Kelly Deyse
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/00130000089gd
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/5878
• topic: Chlamydia trachomatis; HPV; Sorologia; PCR; NIC; Chlamydia trachomatis; HPV; Serology; PCR,; CIN; CIENCIAS BIOLOGICAS::MICROBIOLOGIA

Infection with Chlamydia trachomatis (CT) may be associated with persistent carcinogenic HPV types and the development of cervical neoplasia. There are indications that detection of CT serum antibodies rather than DNA is a better measure of cumulative exposure to CT or of exposure occurring several years prior to the development of cervical disease. The objective of this study was to compare the positivity for CT by ELISA and PCR and to correlate with the severity of cervical neoplasia in women with abnormal cervical smear. Between February 2007 and March 2009, 136 women were referred to the colposcopy clinic at the Santa Casa de Misericordia in Goiânia-GO. HPV DNA was detected by the polymerase chain reaction (PCR) and genotyping was performed by reverse line-blot hybridization assay. CT seropositivity was tested by ELISA for the detection of IgG antibodies and the detection of CT was done by PCR to amplify a sequence in the cryptic plasmid generating a fragment of 512 base pairs. The total prevalence of HPV infection was 85.2%. Seropositivity for CT was 26%. Thirty-one women 26.7 were tested positive for CT antibodies and HPV-DNA. Of these 10.3% had diagnosis of cervical intraepithelial neoplasia grade 1 (CIN1) or cervicitis, while 16.3% had histological diagnosis of CIN2 worse diagnosis. When employed PCR test positivity was found to be 8.8%. Eleven women 9.48% were tested positive for CT and HPV DNA. Of these 5.1% had diagnosis of cervicitis or CIN1 and 4.3% had a diagnosis of CIN2 or worse diagnosis. The agreement between serology and PCR tests for CT was considered poor (kappa=0.10 IC 95% 0.69-7.9). Taking as reference the cases negatives for HPV and CT, a positivity for HPV and CT seropositivity was significantly associated with a diagnosis of CIN2 or worse diagnosis, for all HPV types (OR=11.9 IC=2.00-91.5 p=0.0009) and types 16 and 18 (OR=7.50 IC=0.91-76.28 p=0.02). Significant association was observed after adjustment for HPV. A Borderline significance was observed considering other HPV types (OR=7.50 IC=0.91-76.28 p=0.02). CT seropositivity was associated with CIN2 worse diagnosis in women infected by HPV, mainly when the types 16 and 18 were involved. This study did not show any association between CT infection detected by PCR and CIN2 or worse diagnosis. These data support the hypothesis that seropositivity for CT compared to PCR positivity in HPV positive women, especially for types 16 and 18, is a better measure of previous exposure, which reflects a higher probability of association with the severity of cervical neoplasia.