MKI67 and neoplasm: This study suggested that when the patient was less than or equal to 40 years old, the immunohistochemical expression level of Ki-67 and HER-2 was higher (invasive cancer), the molecular subtype was Luminal B and HER-2 overexpression (invasive cancer), the tumor was larger, histological grade (invasive cancer) was higher, and the pathological type included invasive lobular carcinoma, invasive micropapillary carcinoma, metaplastic carcinoma.