IRF1, PSMB9, TAP1, ETV7, and PSMB10 were related to CD8+ T cell infiltration proportion in thyroid carcinoma, breast invasive carcinoma, head and neck squamous cell carcinoma, hepatocellular carcinoma, lung adenocarcinoma, and skin cutaneous melanoma (Table 5). Here, PSMB9 is linked to invasive breast carcinoma.