We also notice that, in BLCA, HNSC, LAML, LIHC, OV, PAAD, PCPG, TGCT, and UVM, the abnormal expression of PSMB9 seems to be involved in epithelial–mesenchymal transformation, which plays a critical role in tumor invasion. The gene discussed is PSMB9; the disease is bladder transitional cell carcinoma.