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Cumulative locoregional recurrence rates among hormone receptor-positive subgroups. Pairwise comparison HR+/HER2− vs HR+/HER2+/No Tz p=0.002; HR+/HER2− vs HR+/HER2+/Yes Tz p=0.506. HR = Hormone receptor; HER2 = Human epidermal growth factor receptor 2; Tz = Trastuzumab.
