HADHA and nonpapillary renal cell carcinoma: Then the four enzymes involved in FAO were analyzed, and all of them were protective factors, i.e., overexpression of CPT1A (HR 95%CI =0.34 (0.22-0.52), P<0.001), HADHA (HR 95%CI =0.50 (0.37-0.67), P<0.001), HADHB (HR 95%CI =0.38 (0.28-0.51), P<0.001), and ACAT1 (HR 95%CI =0.41 (0.31-0.56), P<0.001) showed a favorable OS in ccRCC patients.