In addition, several proteins were identified by KM plotter as potential drug targets, such as S100P [29], carbonic anhydrase IX (CAIX) [32], Notch1 [39] in breast cancer, aldehyde dehydrogenase 1 (ALDH1) [40] in NSCLC, Notch2 [24] in ovarian cancer. Here, CA9 is linked to ovarian cancer.