Table 2 shows the HRs for RFS and CSS according to the r-Ki67 labeling index. In this study, the r-Ki67 classification was correlated with RFS but not CSS (RFS: HR = 10.6, P = 0.032; CSS: HR = 5.2, P = 0.27). S5 Table presents the distribution of patients stratified by r-PgR. Furthermore, 64 (60.4%) patients had r-PgR-negative breast cancer, and the PgR status in residual tumors was not a significant prognostic factor for NAE (S6 Table). Here, MKI67 is linked to breast cancer.