The probability of positive axillary lymph node increased together with tumor size (OR 1.93 per additional cm, 95% CI 1.53–2.44) and negativity of tumor estrogen receptors (OR 2.18, 95% CI 1.16–4.08) but decreased together with age at diagnosis (OR 0.98 per additional year, 95% CI 0.96–0.99) and inner location of the tumors, particularly upper-inner tumor (OR 0.49, 95% CI 0.29–0.83) (Table 4). Here, ESR1 is linked to neoplasm.