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Retrospective cohort study of bronchial doses and radiation-induced atelectasis after stereotactic body radiation therapy of lung tumors located close to the bronchial tree.
MedLine Citation:
PMID:  24074933     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
PURPOSE: To evaluate the dose-response relationship between radiation-induced atelectasis after stereotactic body radiation therapy (SBRT) and bronchial dose.
METHODS AND MATERIALS: Seventy-four patients treated with SBRT for tumors close to main, lobar, or segmental bronchi were selected. The association between incidence of atelectasis and bronchial dose parameters (maximum point-dose and minimum dose to the high-dose bronchial volume [ranging from 0.1 cm(3) up to 2.0 cm(3)]) was statistically evaluated with survival analysis models.
RESULTS: Prescribed doses varied between 4 and 20 Gy per fraction in 2-5 fractions. Eighteen patients (24.3%) developed atelectasis considered to be radiation-induced. Statistical analysis showed a significant correlation between the incidence of radiation-induced atelectasis and minimum dose to the high-dose bronchial volumes, of which 0.1 cm(3) (D0.1cm3) was used for further analysis. The median value of D0.1cm3 (α/β = 3 Gy) was EQD2,LQ = 147 Gy3 (range, 20-293 Gy3). For patients who developed atelectasis the median value was EQD2,LQ = 210 Gy3, and for patients who did not develop atelectasis, EQD2,LQ = 105 Gy3. Median time from treatment to development of atelectasis was 8.0 months (range, 1.1-30.1 months).
CONCLUSION: In this retrospective study a significant dose-response relationship between the incidence of atelectasis and the dose to the high-dose volume of the bronchi is shown.
Authors:
Kristin Karlsson; Jan Nyman; Pia Baumann; Peter Wersäll; Ninni Drugge; Giovanna Gagliardi; Karl-Axel Johansson; Jan-Olov Persson; Eva Rutkowska; Owe Tullgren; Ingmar Lax
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of radiation oncology, biology, physics     Volume:  87     ISSN:  1879-355X     ISO Abbreviation:  Int. J. Radiat. Oncol. Biol. Phys.     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-09-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7603616     Medline TA:  Int J Radiat Oncol Biol Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  590-5     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 Elsevier Inc. All rights reserved.
Affiliation:
Department of Medical Physics, Karolinska University Hospital, Stockholm, Sweden; Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden. Electronic address: kristin.karlsson@karolinska.se.
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