Intriguingly, high methylation levels of PTTG1, as well as its potential transcriptional targets (i.e., CHEK2, OCIAD2, UBE2L3, and ZNF367), could predict the poor prognosis of BLCA patients preferably (P < 0.05) (Figs. S4–S7). This evidence concerns the gene PTTG1 and bladder transitional cell carcinoma.