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Objective: To investigate the expression of aquaporin 1 in cervical squamous carcinomas (CSC) and cervical precancerous lesions, and the relationship between the tumor clinicopathological parameters, prognosis and the expression of AQP1. Methods: Immunohistochemical method (EliVision) was used to detect the expression of AQP1 in samples from 106 patients [20 with normal cervical tissue, 30 with cervical intraepithelial neoplasia (stage Ⅰ and Ⅱ) and 56 with CSC]. Survival analysis was performed by Kaplan-Meier method. Results: AQP1 protein was expressed in vascular endothelia of all samples. It showed upregulation of AQP1 expression in CSC. There was a significant difference between CSC and normal cervical tissues (P