RELATIONSHIP BETWEEN CYCLIN G1 AND HUMAN PAPILLOMA VIRUS INFECTION IN CERVICAL INTRAEPITHELIAL NEOPLASIA AND CERVICAL CARCINOMA

CERVICAL carcinoma has a long time or a rever-sal precursor period: cervical intraepithelial ne-oplasia (CIN)·CIN presents a biological con-tinuum·It is believed that CIN may progress to an invasivedisease, remain steady, or even reverse·1It is very im…

RELATIONSHIP BETWEEN CYCLIN G1 AND HUMAN PAPILLOMA VIRUS INFECTION IN CERVICAL INTRAEPITHELIAL NEOPLASIA AND CERVICAL CARCINOMA

Objective To evaluate the overexpression of cyclin G1 in cervical intraepithelial neoplasia (CIN) and cervical carcinoma, and the correlation between cyclin G1 and high-risk human papilloma virus (HPV) infection. Methods All of the specimens were obtained from the Department of Pathology of China-Japan Friendship Hospital from January 2000 to August 2004.We detected the expression of cyclin G1 with immunohistochemistry, HPV16/18 infection with in situ hybridization, and high-risk HPV infection with Hybrid capture system II (HC-II) in normal group (25 cases), CIN I (48 cases), CIN II (56 cases), CIN III (54 cases), and invasive cervical squamous-cell carcinoma (SCC, 31 cases). Results The positive rates of cyclin G1 expression in CIN(77.85%)and SCC cervical tissues (87.10%) were significantly higher than normal (8.00%, P<0.01), and the intensities of cyclin G1 expression in CIN(40.60%)and SCC cervical tissues (61.51%) were significantly higher than normal (2.72%, P<0.05). The positive rates and intensities of cyclin G1 expression increased gradually with the grade of cervical lesions. High-risk HPV infection rates were higher in CIN and SCC than normal groups (P<0.05). There was a positive correlation between cyclin G1 expression and high-risk HPV infection detected with HC-II (Kendall's tau-b=0.316, 0.269, 0.352, and 0.474 in CIN I, CINII, CIN III, and SCC, respectively, P<0.05). Conclusions Cyclin G1 is overexpressed in CIN and SCC. Cyclin G1 may be a biomarker for detecting CIN and SCC. Cyclin G1 may play an important role in the oncogenesis of CIN and SCC by high-risk HPV infection.