RB1 and nonpapillary renal cell carcinoma: In addition, using the GEPIA web server, which provides interactive patient survival analysis based on TCGA data [27], we found that low expression of CTDSP1, CTDSP2, CTDSPL, and RB1 was associated with poorer overall survival in ccRCC (p < 0.001, log-rank test) (Figure 3E–H).