PDK4 and nonpapillary renal cell carcinoma: Those genes were incorporated into a multivariable cox model to identify the independent risk factors, and 9 genes, including SLC16A12, ASPA, SMIM24, FLRT3, LAMB3, PLG, IL20RB, CXCL5, PDK4, were identified as independent risk factors for ccRCC (Fig. 7D, Table S6).