Use of radiotherapy in patients for whom radiation following breast-conserving surgery or mastectomy should be indicated.

<p><sup>a</sup> Patients for whom post-mastectomy radiotherapy should be indicated include those with≥4 positive lymph nodes or tumor size≥5cm.</p><p><sup>b</sup> Two-sided p value by Fisher’s exact test.</p><p>Use of radiotherapy in patients for whom radiation following breast-conserving surgery or mastectomy should be indicated.</p>