FTH1 and nonpapillary renal cell carcinoma: Since FTH1 and NCOA4 are important proteins related to ferritinophagy, tumor cells of patients with ccRCC may block the autophagy degradation pathway of ferritin in lysosomes through the low expression of NCOA4, downregulate the level of label iron pool in tumor cells, and inhibit the occurrence of ferroptosis to achieve immune evasion of tumor cells.