A sum of 9 genes was contained in this predictive model, including ANXA1, CALD1, EMP1, ABRACL, BTG1, MDK, IL32, ARPC5, and PSMD2, almost all of which were significantly associated with B cell infiltration proportion (all P < 0.05, Figure 4F), indicating that BCRS might be associated with B cell infiltration in BLCA samples (see below for more analyses). Here, BTG1 is linked to bladder transitional cell carcinoma.