Univariate analysis showed that AR expression was associated with older age (P = 0.022), earlier T stage (P = 0.048), lower histological grade (P = 0.034), ER positivity (P < 0.001), PR positivity (P < 0.001) and HER2 positivity (P < 0.001) in breast cancer. The gene discussed is ESR1; the disease is breast carcinoma.