Ki-67—Playing a key role in breast cancer but difficult to apply precisely in the real world. - Wang, Changsong; Chen, JingChang; Lv, Xuexia; Yun, Tian; Wang, Yaxi; Meng, Nianlong; Li, Fulin; Cao, Yansha; Fan, Naijun; Wang, Xiaoyue (BMC Cancer, 2025)