Document Detail


Radiation field design and patterns of locoregional recurrence following definitive radiotherapy for breast cancer.
MedLine Citation:
PMID:  23312271     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
PURPOSE: Locoregional control is associated with breast cancer-specific and overall survival in select women with breast cancer. Although several patient, tumor, and treatment characteristics have been shown to contribute to locoregional recurrence (LRR), studies evaluating factors related to radiotherapy (XRT) technique have been limited. We investigated the relationship between LRR location and XRT fields and dose delivered to the primary breast cancer in women experiencing subsequent locoregional relapse.
METHODS AND MATERIALS: We identified 21 women who were previously treated definitively with surgery and XRT for breast cancer. All patients developed biopsy-result proven LRR and presented to Emory University Hospital between 2004 and 2010 for treatment. Computed tomography (CT) simulation scans with XRT dose files for the initial breast cancer were fused with (18)F-labeled fluorodeoxyglucose positron emission tomography (FDG PET)/CT images in DICOM (Digital Imaging and Communications in Medicine) format identifying the LRR. Each LRR was categorized as in-field, defined as ≥95% of the LRR volume receiving ≥95% of the prescribed whole-breast dose; marginal, defined as LRR at the field edge and/or not receiving ≥95% of the prescribed dose to ≥95% of the volume; or out-of-field, that is, LRR intentionally not treated with the original XRT plan.
RESULTS: Of the 24 identified LRRs (3 patients experienced two LRRs), 3 were in-field, 9 were marginal, and 12 were out-of-field. Two of the 3 in-field LRRs were marginal misses of the additional boost XRT dose. Out-of-field LRRs consisted of six supraclavicular and six internal mammary nodal recurrences.
CONCLUSIONS: Most LRRs in our study occurred in areas not fully covered by the prescribed XRT dose or were purposely excluded from the original XRT fields. Our data suggest that XRT technique, field design, and dose play a critical role in preventing LRR in women with breast cancer.
Authors:
Susie A Chen; David M Schuster; Donna Mister; Tian Liu; Karen Godette; Mylin A Torres
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of radiation oncology, biology, physics     Volume:  85     ISSN:  1879-355X     ISO Abbreviation:  Int. J. Radiat. Oncol. Biol. Phys.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-14     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:  309-14     Citation Subset:  IM    
Copyright Information:
Published by Elsevier Inc.
Affiliation:
Department of Radiation Oncology, Winship Cancer Institute, Emory University, Atlanta, Georgia.
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