The treatment of cervical intraepithelial neoplasia (CIN) depends on the evaluation of CIN grade. The grading of CIN is however problematic, as intra- and interobserver reproducibility of CIN-grade evaluation among pathologists is not perfect. There are also difficulties in reliably distinguishing CIN from nonneoplastic lesions, and over- or undertreatment can be the result. These points suggest a need for adjuvant methods that can distinguish CIN from nonneoplastic lesions, and can distinguish different CIN grades and predict the risk of progression of early CIN1 and -2 lesions. This chapter describes the use of biomarker-related methods for the diagnosis and prognostic evaluation of patients with CIN1 and CIN2. As CIN involves the progressive dysfunction of proliferation and differentiation activities in cervical epithelial cells, we have concentrated in this chapter on demonstrating the utility of proliferation- and differentiation-related biomarkers.