MKI67 and neoplasm: The post-treatment Ki67 index in the 152 cases with residual tumor was ≥14% in 12 (8.4%) patients as a result of a change from luminal B to luminal A in 19 patients (50% of 38 initially luminal B) by effect of NACT, and the conversion of three luminal A to luminal B. Residual disease in breast was <2 cm (ypT0 or ypT1) in 111 (66.1%) patients and 127 (75.6%) had fewer than three positive axillary lymph nodes (ypN0 or ypN1).