Souza and his co-workers have studied the correlation of the concentration of IL-17 on serum from patients and different grades of squamous intraepithelial lesions and invasive cervical carcinoma [30], not to mention the pro-metastatic and invasive effect of IL-17A on cervical cancer as well as its underling mechanism. The gene discussed is IL17A; the disease is squamous cell intraepithelial neoplasia.