Low nuclear Cdk5 expression was significantly associated with survival (hazard ratio (HR) = 0.612, 95% confidence interval (CI) = 0.418‐0.896, P = .011) when confounding prognostic factors were included in multivariate analysis (including tumour size, tumour grade, stage, NPI, ER status, PR status, HER2 status and vascular invasion [all with individual log‐rank statistics of P < .001]). The gene discussed is ERBB2; the disease is neoplasm.