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Kaplan-Meier plots of breast cancer-specific survival (BCSS) (a–c) and distant disease-free survival (DDFS) (d–f) according to risk of recurrence categories within the pN0 hormone receptor-positive/human epidermal growth factor receptor 2-negative (HR+/HER2−) subgroup for all patients (a, d), patients with no adjuvant treatment (b, e), and patients with adjuvant tamoxifen only (c, f). p Values were derived from log-rank tests
