Upon analyzing the clinical data and ultrasound characteristics, statistically significant differences (P < 0.05) were observed among the four groups of molecular typing in female patients diagnosed with breast cancer in the following indicators: ethnicity, number of lymph node metastases, lesion size, histologic grading, expression of Ki-67, risk of postoperative recurrence, clinical stage, and features of ultrasound images (mass morphology, internal echogenicity, abnormal lymph node morphology, and internal calcification) (refer to Table 2). Here, MKI67 is linked to metastatic malignant neoplasm in the lymph nodes.