To exclude a possible false‐negative signal for SDHB staining in ccRCC (Cornejo, et al., 2015; Gill, 2018), we also analyzed the endothelial cells of blood vessels within the tumor and normal renal epithelium as a positive control (Supporting Infoamtion Figure S1a,b). This evidence concerns the gene SDHB and nonpapillary renal cell carcinoma.