NFKB1 and nonpapillary renal cell carcinoma: Here, we unveil that the enhanced expression of the RNA‐binding protein DNA dC → dU‐editing enzyme APOBEC‐3C (APOBEC3C; also known as A3C) in ccRCC tissue and ccRCC‐derived cell lines serves as a catalyst for tumor growth by amplifying nuclear factor‐kappa B (NF‐κB) activity.