showed that CXCL9 expression was higher in ulcerative colitis‐associated colorectal cancer (UC‐Ca) of 10 patients than in UC‐NonCa of 43 patients, which would improve the accuracy of UC‐Ca diagnosis (positive value 83%, negative value 100%) when combined with 19 other cancer‐related genes, such as cytochrome P450, family 27 B1 (CYP27B1), and Runt‐related transcription factor 3 (RUNX3) 56. This evidence concerns the gene CXCL9 and cancer.