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Published in: Breast Cancer Research and Treatment 1/2019

01-11-2019 | Mastectomy | Epidemiology

National trends of synchronous bilateral breast cancer incidence in the United States

Authors: Takehiko Sakai, Enver Ozkurt, Stephen DeSantis, Stephanie M. Wong, Laurel Rosenbaum, Hui Zheng, Mehra Golshan

Published in: Breast Cancer Research and Treatment | Issue 1/2019

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Abstract

Purpose

Increase in breast cancer survivorship, advancements in diagnostic imaging and standardization of contralateral breast screening before breast cancer surgery have resulted in increased detection of contralateral breast cancer (CBC). The aim of this study was to assess national trends of synchronous bilateral breast cancer (sBBC) and metachronous bilateral breast cancer (mBBC) incidence in newly diagnosed breast cancer patients.

Methods

The Surveillance, Epidemiology, and End Results (SEER) database (1973–2014) was used to identify 11,177 women diagnosed with CBC. CBC was classified as sBBC when primary breast cancer in both breasts is diagnosed in the same year, or as mBBC, when diagnosed more than one year from primary breast cancer. Temporal trends in sBBC incidence were then evaluated using the Cochran-Armitage test for trend.

Results

Of the 11,177 women diagnosed with CBC, 4228 (38%) had sBBC and 6949 (62%) had mBBC. The incidence of sBBC increased significantly from 1.4% in 1975 to 2.9% in 2014 (p < 0.001). sBBC was more likely to be diagnosed as early stage in recent years (78% in 1975 vs. 90% in 2014 [p < 0.001]), and 69% of patients were treated with mastectomy in 2014.

Conclusion

The number of sBBC has increased, and contralateral tumors are more likely to be detected at an early stage with the first primary breast cancer. Despite the early stage findings, most were treated with mastectomy. Further studies are needed to define the best therapy for patients with contralateral disease and optimal surveillance and detection methods.
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Metadata
Title
National trends of synchronous bilateral breast cancer incidence in the United States
Authors
Takehiko Sakai
Enver Ozkurt
Stephen DeSantis
Stephanie M. Wong
Laurel Rosenbaum
Hui Zheng
Mehra Golshan
Publication date
01-11-2019
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 1/2019
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-019-05363-0

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