Breast carcinoma is the most common malignancy in women, accounting for 25% of all female cancer cases and 15% of all cancer-related deaths in the world.Lymph node metastasis is a multifactorial event. Among patients with a preoperative axillary ultrasound, almost 40% of patients are pathologically proved to be free from axillary metastasis.The purpose of this study is to develop a nomogram to evaluate the probability of axillary metastasis as a tool to support clinical decision-making.
