High expression of CIP2A was associated with significantly reduced OS in patients with luminal A breast cancer [hazard ratio = 1.98 (1.18–3.32), P < 0.01] but not in patients with basal‐like breast cancer [hazard ratio = 0.63 (0.33–1.20), P = 0.156]. The gene discussed is CIP2A; the disease is breast carcinoma.