ALDH1A1 and ovarian cancer: In this study, we used the TCGA data and an online tool, KM plotter analysis, to identify the positive relationship between HIF‐2α (not HIF‐1α) and ALDH1A1 mRNA expression as well as the positive association between higher HIF‐2α (but not HIF‐1α) mRNA expression and shorter OS in ovarian cancer patients.