Figure 1.

Algorithm for patient selection.

Notes: The Surveillance, Epidemiology, and End Results database was used to identify patients diagnosed with DCIS of the breast. Inclusion criteria were as follows: female, aged from 18 years to 79 years, diagnosed between 1998 and 2007, confirmed by positive histology, who underwent breast-conserving surgery, and who received postoperative RT or no RT. In all, 56,968 patients were included in this analysis.

Abbreviations: DCIS, ductal carcinoma in situ; RT, radiotherapy.