MKI67 and breast cancer: For example, triple-negative tumors (usually PR-negative, high Ki-67) frequently received preoperative treatment in our sample, which is predicted given that TNBCs often react well to chemotherapy, achieving pathologic full remission in approximately 40% of cases, as also reported by Srivastava et al. in their study on triple-negative low Ki-67 breast cancers (2022) [27].