On the other hand, the survival data and gene expression data of the TCGA-BLCA and GSE13507 were combined to identify 13 PIGs that may significantly affect the prognosis of BLCA patients, namely, CTSS, PDGFRA, PDGFRB, PDGFC, TNC, EDNRA, NRP2, TGFB3, FABP6, S100A7, S100A8, S100A9, and S100A10. The gene discussed is S100A9; the disease is bladder transitional cell carcinoma.