ESR1 and metastatic malignant neoplasm in the lymph nodes: The results of the multivariate analyses showed that age, menopause, invasive, diameter, lymph node metastasis, TNM, Ki 67, estrogen receptors, progesterone receptors, breast surgery, axillary surgery, adjuvant chemotherapy, targeted therapy, adjuvant radiotherapy, adjuvant endocrine therapy, and neoadjuvant therapy had a P value of less than .05, and the Cox model was built by these features.