CD8A and bladder transitional cell carcinoma: Moreover, the mRNA expression level of ACE2 has a correlation with infiltrating levels of CD8+ T cells in 10 different types of cancers (BLCA, BRCA, BRCA‐luminal, KICH, KIRC, LGG, PAAD, PRAD, THCA, UCEC), whereas it demonstrates negative correlation with CD8+ T‐cell infiltration in COAD, glioblastoma multiforme (GBM), OV.