STEAP4 and hepatocellular carcinoma: The Western blot analysis was in good agreement with the proteomic results, since HER2 and STEAP4 expression was detected only in the HCC-1954 cell line (Figures 3A, B), CD97 was identified only in the MDA-MB-231 cell line (Figure 3D) and EPHA2 was solely increased in the HCC-1954 and the MDA-MB-231 cell lines compared to a low expression in the MCF-10A cell line (Figure 3C).