To answer this question, one must first understand why axillary lymphatic dissection is necessary. We say that the main purpose of axillary lymphatic drainage is not to remove the cancerous tumor, but to determine the disease through the lymph nodes and to guide the postoperative treatment. In fact, lymph nodes are an important defense force for our body to fight against cancerous tumors and do not need to be removed by themselves. Secondly, a significant percentage of breast cancer patients do not have axillary lymph node metastasis, and for them, axillary lymphatic clearance should be avoided. In addition, a significant percentage of patients have only isolated lymph node metastases, which often occur at the first level of the axilla. They are easily removed by limited debridement. Axillary lymph nodes are generally divided into three levels, and if all three levels are cleared, they can bring about many immediate and long-term complications, such as upper limb edema, pain, impaired shoulder joint movement, and numbness. The quality of life of patients is seriously affected. The emergence of anterior lymph node biopsy in the last 20 years can accurately determine whether there is metastasis in the axillary lymph nodes, thus avoiding the need to clear the axillary lymph nodes in patients who do not have metastasis.