Isolated locoregional recurrence patterns of breast cancer after mastectomy and adjuvant systemic therapies in the contemporary era.

Compared with HR-positive subgroup, a smaller proportion of patients in the HR-negative group were observed to experience recurrences after 5 years; however, their difference did not reach statistical significance (23.2% vs. 14.1%, χ 2 = 2.51, P = 0.112).

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