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a, b Kaplan–Meier curves for relapse-free and overall survival of T1–T4, any N and M0 cases with respect to estrogen receptor (ER) status and HER2 (human epidermal growth factor receptor 2) amplification status. P values were calculated using the log rank test. Relapse-free survival and overall survival of patients with respect to combined ER and HER2 status
