Breast-conserving surgery with or without irradiation in women with invasive ductal carcinoma of the breast receiving preoperative systemic therapy: A cohort study.

Compared with the non-BRT group, the WBRT group did not reach statistical significance at stages ypN1, cT0–1, and cT4 owing to the small sample size in the subgroups of the non-BRT group ( Table 1 and Supplemental Fig 1 ).

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