Positive correlations were observed between EZH2 expression and the infiltration of Tregs in BLCA, BRCA, BRCA-Basal, BRCA-LumA, CESC, GBM, HNSC, HNSC-HPV+, HNSC-HPV−, KIRP, LGG, LIHC, OV, PRAD, SKCM, STAD, and THCA; the infiltration of CAFs in ACC, CESC, KICH, LGG, LIHC, LUAD, MESO, PCPG, PRAD, SKCM, and THCA; the infiltration of MDSC in ACC, BLCA, BRCA, BRCA-Basal, BRCA-LumA, BRCA-LumB, CHOL, COAD, esophageal carcinoma (ESCA), GBM, HNSC-HPV−, KICH, KIRP, LGG, LIHC, LUAD, LUSC, MESO, OV, PAAD, PCPG, PRAD, READ, SARC, SKCM, STAD, TGCT, THYM, UCEC, UCS, and UVM (Figure 9B). This evidence concerns the gene EZH2 and bladder transitional cell carcinoma.