The advantage of chemotherapy before surgery for breast cancer is to improve the treatment effect of surgery and prevent recurrence after surgery; the disadvantage is that it may cause side effects. ⒈ Advantages: Chemotherapy before surgery for breast cancer is suitable for patients who have axillary lymph node metastasis, lump >5cm, etc. Since surgery cannot remove the tumor cleanly, chemotherapy before surgery can make the tumor shrink, reduce the difficulty of surgery, improve the resection rate of the tumor and the effect of eradication, and improve the therapeutic effect of surgery. Chemotherapy before surgery can also remove breast cancer cells that may be present in the blood circulation and reduce the risk of recurrence and metastasis after surgery. Pecuniary Disadvantages: Since chemotherapy uses chemicals to kill cancer cells, the drugs are toxic and can affect cells throughout the body. Each person’s physical quality is different, and will produce different degrees of side effects during chemotherapy, such as damaging the liver, kidney, heart, lungs and other important organs of the organism, which may be life-threatening in serious cases. It is recommended that patients follow the doctor’s instructions in regular hospitals.