STEAP2 and liver cancer: The CPTAC dataset revealed that STEAP2 total protein expression was higher in primary tissues of liver cancer, lung cancer (p < 0.001), and PAAD (p < 0.05) compared to normal tissues, but it was lower in GBM (p < 0.001) and ovarian cancer (Figure 5B, p < 0.05) compared to normal controls.