APBI Patient Selection Criteria
	American Brachytherapy Society (ABS)	American Society of Breast Surgeons (ASBS)
Age	≥ 50 years	≥ 45 years
Diagnosis	Invasive ductal carcinoma	Invasive ductal carcinoma or ductal carcinoma in situ
Size	≤ 3 cm	≤ 3 cm
Margin Status	Negative; no tumor involving linked margin	Negative at least 2 mm in all directions
Nodal Status	Negative; axillary lymph node dissection or sentinel lymph node evaluation	Negative; axillary lymph node dissection or sentinel lymph node evaluation

Sources:

Reference for ABS guidelines for APBI: M Keisch, D Arthur, R Patel, et al. American Brachytherapy Society Breast Brachytherapy Task Group (February 2007): http://www.americanbrachytherapy.org/resources/abs_breast_brachytherapy_taskgroup.pdf

Reference for ASBS guidelines for APBI: The American Society of Breast Surgeons Consensus Statement for Accelerated Breast Irradiation:
http://www.breastsurgeons.org/statements/PDF_Statements/APBI_statement_revised_100708.pdf