Dynamin 2 expression as a biomarker in grading of cervical intraepithelial neoplasia

Objective: Dynamin 2, which plays a role in endocytosis, is known to be required for HPV infection on host cells. We investigated dynamin 2 as a biomarker in grading of cervical intraepithelial neoplasia (CIN) by comparing with Ki-67 expression and the type of HPV infection (low-risk vs. high-risk). Study design: We performed immunohistochemical stains of dynamin 2 and Ki-67 on tumor samples of patients with CIN and the type of HPV infection was investigated. Results: All the patients with reactive changes (n = 7) or normal (n = 4) did not show dynamin 2 expression. There were 33, 14, and 12 cases with CIN I, II, and III, respectively, and there was a negative correlation between the degree of dynamin 2 expression and the severity of CIN lesions with statistical significance (P < 0.001). Negative expression of dynamin 2 was more sensitive for the detection of CIN II/III than high expression (2+) of Ki-67 (96.2% vs. 73.1%, P = 0.041). Among patients in whom HPV infection was detected, the degrees of dynamin 2 expression were not associated with the type of HPV infection (low-risk vs. high-risk). Overall, there was a negative correlation between the expression patterns of Ki-67 and dynamin 2. Conclusion: We found that dynamin 2 may be a helpful biomarker in grading of CIN lesions and a candidate biomarker for detecting low grade CIN with high sensitivity. (C) 2012 Elsevier Ireland Ltd. All rights reserved.