Stereotactic ablative body radiotherapy (SABR) for effective palliation of metastases: factors affecting local control.


Journal Article

We analyzed factors associated with inferior local control following stereotactic ablative body radiotherapy (SABR) for palliation of metastases. We reviewed records of patients receiving SABR for metastases at Duke University from 2006-2010. Biologically effective dose (BED) was calculated using the linear-quadratic model. Toxicity was assessed by CTCAE v4.0. The Kaplan-Meier method was used to estimate overall survival (OS) and local control (LC) within subgroups (primary or salvage SABR). Univariate (UVA) and multivariate (MVA) regression analysis was used. Fifty and 33 patients received primary and salvage SABR, respectively. 105 lesions were treated (52 spine, 27 lung, 7 liver, 11 other); 67 primary SABR and 38 salvage. Median clinical follow-up was 11.1 months and 10.3 months with imaging of the treated lesion. One patient received SABR x3 and died from toxicity. 88% of symptomatic patients improved after SABR. 1-year LC and OS were 83% and 50%, respectively. Primary SABR had higher BED and was associated with improved LC on UVA (HR 3.0, p=0.01) and MVA (p=0.02); treatment site and histology were not. SABR results in effective palliation of metastases regardless of prior treatment. In the absence of prior EBRT, SABR can be delivered with higher BED and may be associated with better outcomes.

Full Text

Duke Authors

Cited Authors

  • Patel, PR; Kirkpatrick, J; Salama, JK; Nelson, J; Broadwater, G; Allen, K; Clough, R; Yin, F-F; Wang, Z; Chang, Z; Kelsey, C; Ghafoori, AP

Published Date

  • 2014

Published In

Volume / Issue

  • 3 / 2

Start / End Page

  • 123 - 129

PubMed ID

  • 29296393

Pubmed Central ID

  • 29296393

International Standard Serial Number (ISSN)

  • 2156-4639


  • eng

Conference Location

  • United States