The results indicated that there were significant differences in sentinel lymph node metastasis rates among breast cancer patients of different ages, Ki-67 and HER-2 immunohistochemical expression levels (invasive carcinoma), molecular subtypes (invasive carcinoma), tumor size, histological grade (invasive carcinoma) and pathological types (P < 0.05) as shown Table 1. Here, MKI67 is linked to breast cancer.