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Published in: Annals of Surgical Oncology 3/2014

01-03-2014 | Breast Oncology

Breast-Conserving Surgery With or Without Radiotherapy in Older Breast Patients With Early Stage Breast Cancer: A Systematic Review and Meta-analysis

Authors: Willemien van de Water, MD, Esther Bastiaannet, PhD, Astrid N. Scholten, MD, Mandy Kiderlen, MD, Anton J. M. de Craen, PhD, Rudi G. J. Westendorp, MD, PhD, Cornelis J. H. van de Velde, MD, PhD, Gerrit-Jan Liefers, MD, PhD

Published in: Annals of Surgical Oncology | Issue 3/2014

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Abstract

Background

In early stage breast cancer, radiotherapy is an integral part of locoregional treatment with breast-conserving surgery. However, few older patients are included in the clinical trials upon which these recommendations are based. Therefore, we performed a systematic review and meta-analysis to evaluate outcomes of radiotherapy after breast-conserving surgery in older patients.

Methods

A systematic search of PubMed and Embase was undertaken. Inclusion was restricted to randomized controlled trials in postmenopausal breast cancer patients. Pooled odds ratios were calculated for locoregional recurrence, distant recurrence, and overall survival.

Results

We included 5 randomized clinical trials comprising 3,190 patients. Overall, 39 % of the patients were ≥70 years old, and most had hormone receptor–positive T1 tumors without nodal involvement. All patients received adjuvant systemic therapy. Patients who received radiotherapy had a lower relative risk of locoregional recurrence (pooled odds ratio [OR] 0.36; 95 % confidence interval [CI] 0.25–0.50). The 5-year absolute risk was 2.2 % (95 % CI 1.6–3.1) among patients who received radiotherapy, versus 6.5 % (95 % CI 5.3–7.9) among patients who did not. The absolute risk difference was 4.3 % (95 % CI 2.9–5.7), corresponding with a number needed to treat of 24. No differences were observed for distant recurrence or overall survival.

Conclusions

Although patients who received radiotherapy had a lower relative risk of locoregional recurrence, the absolute risk was low, and overall survival was not affected. We propose that the debate should not only focus on the relative risk but also on the absolute benefit of radiotherapy and the number needed to treat. Both treatment options may be reasonable in clinical practice.
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Metadata
Title
Breast-Conserving Surgery With or Without Radiotherapy in Older Breast Patients With Early Stage Breast Cancer: A Systematic Review and Meta-analysis
Authors
Willemien van de Water, MD
Esther Bastiaannet, PhD
Astrid N. Scholten, MD
Mandy Kiderlen, MD
Anton J. M. de Craen, PhD
Rudi G. J. Westendorp, MD, PhD
Cornelis J. H. van de Velde, MD, PhD
Gerrit-Jan Liefers, MD, PhD
Publication date
01-03-2014
Publisher
Springer US
Published in
Annals of Surgical Oncology / Issue 3/2014
Print ISSN: 1068-9265
Electronic ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-013-3374-y

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