PYCR1 and nonpapillary renal cell carcinoma: Afterwards, we performed multiple stepwise Cox regression analysis on these 9 MTGs and further screened out 6 MTGs that were most relevant to the prognosis of patients with ccRCC based on AIC information statistics, including ACAD11, ACADSB, BID, PYCR1, SLC25A27, and STAR (Figure 3(c)).