AQP1 and gastric cancer: Positive correlations between AQP1 expression and tumor development have been detected in cancers of the reproductive system (ovarian cancer [96] and prostate cancer [97]), digestive system (cancers of the stomach [98], colon [99], and esophagus [100]), and other systems (astrocytoma [101], and cancers of the lung [102], breast [103, 104], bladder [105], and pleura [106]).