PSMB9 and neoplasm: Simultaneously, tumor cells interfere with molecules related to antigen presentation, such as transporter associated with antigen processing-1 (TAP-1), low-molecular-mass protein-2 (LMP2), lipoma preferred partner 7 (LPP7), and tapasin, the expression of which is deregulated during cancer development, thereby evading elimination [60,62,65].