Margins for Breast-conserving Surgery With Whole Breast Irradiation in Stage I and II Invasive Breast Cancer

This is a clinical practice guideline for patients with stage I or II invasive breast cancer. The guideline reviews the relationship between margin width and ipsilateral breast tumour recurrence (IBTR), and provides recommendations on adequate margin width in those patients undergoing breast conserving surgery and whole breast radiation therapy. Outcomes of interest include IBTR rate, risk of IBTR recurrence, and margin width.