Previous studies reported that DCLK1 level in colorectal, gastric, pancreatic, breast, and esophageal cancers and clear renal cell carcinoma is higher in tumor tissues compared with adjacent tissues [37,39,69,70,71,72], and it can predict poor survival in kidney and pancreatic cancers [35,41]. This evidence concerns the gene DCLK1 and clear cell renal carcinoma.