CD8A and nonpapillary renal cell carcinoma: To effectively examine the possible function of FECH in influencing the infiltration status of distinct immune cells in ccRCC, we employed data from the TIMER and GEPIA databases to establish the connection between FECH and different immune marker sets, which are generally acknowledged as being indicators of various immunocytes, comprising DCs, NK cells, M1/M2 macrophages, neutrophils, tumor-associated macrophages (TAMs), B cells, monocytes, T cells (general), and CD8+ T cells, in ccRCC (Table S1).