Statistical analysis revealed significant differences (P < 0.05) among female patients diagnosed with breast cancer having distinct postoperative recurrence risks in the following indicators: the number of lymph node metastases, lesion size, histological grading, vascular tumor embolus, nerve invasion, ER expression, PR expression, HER-2 expression, proliferation marker (Ki-67) expression, molecular typing, clinical staging, and ultrasound image characteristics (blood flow, mass morphology, mass margins, lymph node morphology, internal calcification) (refer to Table 1). This evidence concerns the gene MKI67 and metastatic malignant neoplasm in the lymph nodes.