Close margin <2mm is not associated with higher risks of 10-year local recurrence and breast cancer mortality compared to negative margins in women treated with breast-conserving therapy

The 2014 SS0/ASTRO consensus suggests "no ink on tumor" is a sufficient surgical margin for invasive breast cancer treated with breast conserving surgery (BCS). Whether close margin <2 mm is associated with inferior outcomes remains controversial. This study evaluates 10-year outcomes by margin status in a population-based cohort treated with BCS and adjuvant radiotherapy (RT).

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