CLCNKB and clear cell renal carcinoma: The other common marker, protective marker CLCNKB is found predominantly expressed in the kidney and was demonstrated to be down‐regulated in clear cell renal cell carcinoma.33, 34 Compared with FABP3, the risk weighting of CLCNKB was less than FABP3 in the Cox regression models, and CLCNKB ranked lower than FABP3 in the both RFS‐FS and SVM‐RFE models.