Table 1.

Indications for exclusion from analysis

	Number excluded (n = 50)
Conversion to mastectomy	30
Persistently close/positive margins following re-excision	5
Positive or close margin after initial surgery	21
Tumor emboli in lymphovascular space	1
Patient preference	1
Refusal of RT following BCS	1
ATM mutation	1
Contralateral inflammatory breast cancer	1
Occult primary breast cancer	4
Failure to receive RT	7
Unknown RT status	4
Positive final margins	3
Detailed pathology missing *	1

BCS, breast conservation surgery; RT, radiation therapy;

^*biopsy performed at outside institution and unavailable for review; final pathology: pathologic complete response