%0 Journal Article %T Prevalence and genotypes of human papilloma virus infection in CIN3 in Beijing, China %A Dan Song %A Jiao Chen %A Ruo-Tian Shang %A Si-Meng Jiao %A Wei-Min Kong %A Xuan-Yu Zhao %J SCIE-indexed Journal %D 2020 %R 10.21037/tcr.2020.01.59 %X Before the occurrence of cervical cancer, a period of precancerous lesion, which is known as cervical intraepithelial neoplasia (CIN), is divided into three grades according to the proportion of mature and differentiated cells to the thickness of epithelial cells (1). CIN lesions can be subsided, constant, or progressing, most of the low grade CIN can be reduced or not progressed in a short time, but higher level CIN is more likely to develop for invasive cervical cancer. A larger epidemiological research found that cervical precancerous lesions and cervical cancer are associated with a variety of risk factors, among which HPV infection is the most important risk factor (2-4) %U http://tcr.amegroups.com/article/view/36248/html