However, a positive-value β coefficient (33.6) and lack of significance by the Cox PH model (p-value = 0.41, RR = 0.5) precluded us from clarifying its association with ccRCC progression, for which reason we focused on IKBKB, MMP9, PSMB9, and SOD2. This evidence concerns the gene PSMB9 and nonpapillary renal cell carcinoma.