Analysis of correlation factors for cervical intraepithelial neoplasia in married women in Beijing, China

Abstract

To investigate the characteristic of precancerous conditions of cervical intraepithelial neoplasia (CIN) and its related high-risk factors among the married women in Beijing, China. Based upon the method of cross-sectional survey, 6339 married women at reproductive age from 25 to 54 years old were selected randomly in a total of 137 communities of 12 districts or counties in Beijing from March 2007 to September 2008. The interview was carried out with unified questionnaires and gynecological examinations. And the cervical Pap smear was used for liquid-based cytological examination and the cervical secretion for detection of high-risk human papillomavirus (HPV) DNA. Furthermore, the women with abnormal cervical cytology received colposcopy and cervical biopsy. (1) Among 6, 339 study subjects, 374 cases had CIN and the prevalence rate was 5.9%; (2) For the cases with cervical cytology positive results, cervical biopsy showed an elevated level of abnormal cytology and an increased incidence of cervical lesions; (3) The peak age of CIN prevalence was 30 to 34 years old and there was a high grade of cervical neoplasia; (4) Among the population, the infection rate of high-risk HPV was 9.9% and the infection rate of high-risk HPV in positive cytological group (41.2%) was significantly higher than that in negative cytological group (6.6%); (5) The infection rate and DNA load of high-risk HPV increased following the severity grade of CIN. In Beijing, married women at 30 to 34 years old are the high-risk group in CIN incidence and the infection of high-risk HPV is an independent risk factor. Liquid-base cytology combined with high-risk HPV DNA test is a viable method to discover CIN in time and prevent the incidence of cervical cancer.