FDX1 and nonpapillary renal cell carcinoma: Nevertheless, the methylation sites of the FDX1 gene included cg05485370 (HR:0.518, 95%CI: 0.311-0.863, P = 0.012), cg13258606 (HR:0.42, 95%CI: 0.245-0.718, P = 0.0015), cg23587050 (HR:0.411, 95%CI: 0.269-0.639, P < 0.001) and cg26061355 (HR:0.584, 95%CI: 0.351-0.974, P = 0.039), suggesting a good prognosis for patients suffering from ccRCC.