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Kaplan–Meier survival curves according to Ki-67 (a), Her2 (b), and combined expression (c). Prognostic differences across groups were examined using the log-rank test. Her2, human epidermal growth factor receptor 2; H–K−, Her2 negative and Ki-67 negative; H–K+, Her2 negative and Ki-67 positive; H+K−, Her2 positive and Ki-67 negative; H+K+, Her2 positive and Ki-67 positive
