Other proteins, such as eEF1A1, which was the most significantly down-regulated protein, were found mainly expressed in the cell plasma; the positive expression rate of eEF1A1 was 70.0% in the normal cervix, 73.3% in CIN, and 60.0% in CSCC, without significant differences between them (p = 0.758). This evidence concerns the gene EEF1A1 and cervical squamous intraepithelial neoplasia.