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1033 Background: The Cancer and Leukemia Group B (CALGB) 9343 trial published in 2004 showed no overall survival benefit from radiation in patients >70 years old with estrogen receptor (ER) positive, pT1 tumors with the use of tamoxifen. We tested the hypothesis that the use of radiotherapy decreased in this group of patients following publication of the trial, utilizing the National Cancer Data Base. Methods: 34,853 breast cancer patients 70 years or older with pT1N0/NX, ER positive tumors who underwent a lumpectomy between 2004 and 2007 were studied. Chi-square tests and logistic regression models were used to determine trends and factors related to the use of radiation. Results: The use of radiation decreased from 70.6% in 2004 to 66.4% in 2005, 66.6% in 2006, and 67.2% in 2007 (p

6040 Background: The use of accelerated partial breast irradiation using brachytherapy (APBI-b) for patients with invasive cancer is increasing but data for ductal carcinoma in situ (DCIS) cases are limited. The American Society of Radiation Oncology (ASTRO) guidelines suggest that APBI-b should be used only on a "cautionary" or "on trial" basis for women with DCIS. The purpose of this study was to examine utilization trends and correlates of APBI-b use for patients with DCIS. Methods: A total of 70,043 postlumpectomy patients from the National Cancer Database diagnosed with DCIS between 2002 and 2007 were studied. Chi-square tests and logistic regression models were used to determine trends and factors related to APBI-b use. Results: The use of APBI-b increased from 0.7% in 2002 to 10.0% in 2007 (p