MKI67 and neoplasm: For individuals who underwent NAC (N = 51 patients), the univariable Cox proportional hazards model indicated that a pathological complete response (pCR) was not related to any of the studied factors: tumor size, presence of pathological local lymph nodes, stage (I-III), HR positivity, menopausal status, Ki67 level, histological components, type of chemotherapy, or receiving fully planned systemic treatment (all p > 0.05).