AQP9 is a typical aquaglyceroporin transporting water, glycerol, and urea that plays a major role in fluid homeostasis in normal tissues [15], Recently, some studies reported that AQP9 expression might be involved in the development of several cancers, including epithelial ovarian tumors [16] and glioblastoma [17]. This evidence concerns the gene AQP9 and ovarian epithelial tumor.