FDX1 and nonpapillary renal cell carcinoma: To determine whether FDX1 affects the ccRCC cell phenotype by regulating FMR1, the immunofluorescence EdU method and plate cloning experiment, the immunofluorescence TUNEL method, the cell migration experiment, and the cell invasion experiment were utilised to detect the effect of FMR1 knockdown on cell proliferation, apoptosis, cell migration, and cell invasion, respectively.