Breast cancer patients are most worried about tumor recurrence after surgery, but how to determine their chances of recurrence is always a confusing issue. The size of the lesion (pT) is ≤2cm 2.Grade 1 3.No invasion of peritumor vasculature 4.HER-2 gene is not overexpressed or amplified 5.Age ≥35 years 2.Moderate risk: lymph node negative with at least one of the following: 1.Lesion size (pT) ≥2cm or 2.Grade 2-3 or 3.Invasion of peritumor vasculature or 4.HER-2 gene is overexpressed or amplified or 5. Age <35 years 6. 1-3 positive lymph nodes without HER2 overexpression and amplification III. High risk: 1. 1-3 positive lymph nodes with HER2 overexpression or amplification 2. ≥4 positive lymph nodes