AQP2 mRNA expression exhibited a null correlation with OS within all ovarian cancer patients as well as in serous and endometrioid histological subgroups, HR = 1.13 (0.92–1.38), P=0.25 (Figure 4A), HR = 1.17 (0.93–1.46), P=0.18 (Figure 4B) and HR = 3.01 (0.31–29), P=0.32 (Figure 4C), respectively. This evidence concerns the gene AQP2 and ovarian cancer.