Next, we adjusted ccRCC patients in high‐HIF‐1/2α level group and low‐HIF‐1/2α level group with the NDRG1 expression level so that there was no significant difference in the expression of NDRG1 between the two ccRCC groups (Figure S2c and d). This evidence concerns the gene NDRG1 and nonpapillary renal cell carcinoma.