The expression of KYNU was positively correlated with the expressions of ER (P = .002), PR (P = .007) and E‐cad (P = .03), while negatively associated with tumour grade (P = .008), tumour stage (P < .001) and the expressions of HER2 (P = .04) and Ki‐67 (P = .019). The gene discussed is CDH1; the disease is neoplasm.