CDH4 is incorporated in the molecular prognostic scoring system for predicting OS in ccRCC by Peng et al The system consisted of 21 DEGs including CDH4, DDAH1, CRABP2, TGFA, SEMA3G, SPATA18, PTTG1, SCGN, CYP39A1, CLDN4, ZNF395, IL15RA, APLNR, APOLD1, NTN4, PABPC1L, UBE2C, GNG7, CEACAM1, PLAUR, and SIM2. This evidence concerns the gene DDAH1 and nonpapillary renal cell carcinoma.