STC1 and ovarian carcinoma: Studies have identified various biomarkers for diagnosing and predicting the prognosis of ovarian cancer, including the potential tumor hypoxic marker, hypoxia inducible factor-1α (HIF1α), and its regulated genes, vascular endothelial growth factor (VEGF), carbonate anhydrate IX (CA9) and stanniocalcin 1 (STC1) (11–13).