In previous studies, Yang et al. further subdivided the patients with luminal B breast cancer using PR and Ki-67 index and found that the new classification performed better in predicting the survival outcome and recurrence score [14], whereas Xiong et al. discovered that the ultrasonography-based radscore could be used to differentiate between patients at high and low risk of recurrence in luminal B breast cancer [15]. This evidence concerns the gene MKI67 and breast cancer.