Minimum breast distance largely explains individual variability in doses to contralateral breast from breast-cancer radiotherapy.
Radiother. Oncol. 131, 186-191 (2019)
Purpose: To provide personalized estimates of doses to contralateral breast (CB) from breast-cancer radiotherapy.Methods: Whole-breast irradiations using 3D conformal, intensity-modulated and hybrid techniques with 50.4 Gy prescribed dose were planned for 128 breast-cancer patients. From their CT images, 17 anatomic measures were assessed and tested by model fitting as predictors for CB dose-volume characteristics.Results: Multi-field intensity-modulated radiotherapy (IMRT) yielded mean CB doses of 0.8-7.1 Gy, with no correlation to the studied anatomic parameters. Tangential whole-breast irradiation led to much lower mean CB doses, 0.2-1.6 Gy. About 60% of this inter-patient variability was explained by individual variations in a single anatomic measure, the minimum breast distance (MBD), defined as the CB distance from the tangent to the treated breast. Per 1 cm increase in MBD, the mean CB dose decreased by 10-15%. As an alternative to MBD, dose estimates could be based on the breast-to-breast distance, which is highly correlated with MBD.Conclusion: The results enable personalized assessment of CB doses from tangential whole-breast irradiation, based only on parameters assessable from CT data. This may help support clinical decision-making processes as well as analyse retrospective studies on CB risks. (C) 2018 Elsevier B.V. All rights reserved.
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Publication type
Article: Journal article
Document type
Scientific Article
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Keywords
Breast-cancer Radiotherapy ; Contralateral Breast ; Individual Variability ; Anatomic Parameters; Radiation-therapy Imrt; Tangential Fields; Secondary-cancer; 2nd Primary; Risk; Heart; Recurrence; Lung
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Language
english
Publication Year
2019
Prepublished in Year
2018
HGF-reported in Year
2018
ISSN (print) / ISBN
0167-8140
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1879-0887
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Volume: 131,
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Pages: 186-191
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Elsevier
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Elsevier House, Brookvale Plaza, East Park Shannon, Co, Clare, 00000, Ireland
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Peer reviewed
POF-Topic(s)
30504 - Mechanisms of Genetic and Environmental Influences on Health and Disease
Research field(s)
Radiation Sciences
PSP Element(s)
G-501100-004
G-501100-005
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Erfassungsdatum
2018-10-02