To further confirm the expression levels of NKD1 in the colorectal tumor samples or cancer cells, we first analyzed the Pan‐cancer expression overview of NKD1 gene through the UALCAN web database (http://ualcan.path.uab.edu/cgi‐bin/Pan‐cancer.pl?genenam=NKD1), which showed that NKD1 was significantly downregulated in BLCA, CESC, KICH, KIRC, and so on. The gene discussed is NKD1; the disease is bladder transitional cell carcinoma.