TCF19 and nonpapillary renal cell carcinoma: Intriguingly, we observed that compared to the control (siCtrl), TCF19 knockdown (TCF19‐KD) via RNA interference (siTCF19) (Figure S3A,B) significantly reduced cell proliferation (Figures 1D and S3C–F) and induced cell cycle arrest (Figure S3G) in ccRCC cells.