Cox proportional hazards regression analysis of potential prognostic factors for Metastasis-free survival and overall survival.

aThe main predictor of interest Ki-67 was used in univariate model alone; Ki-67 with other covariates, tumor stage, nodal stage, histological grade, ER status, HER-2 status, P53 status, neo-adjuvant therapy, radiotherapy, and endocrine therapy were included in the model.bAbbreviations: HR, hazard ratio; CI, confidence interval; N/A, not available.*Significant factor, P