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Role of boost radiotherapy for local control of pure ductal carcinoma in situ after breast-conserving surgery: a multicenter, retrospective study of 622 patients

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Abstract

Purpose

To evaluate the effect of boost radiotherapy on ipsilateral breast tumor recurrence (IBTR) for ductal carcinoma in situ (DCIS) after breast-conserving surgery and whole breast radiotherapy (WBRT) with or without boost.

Methods and materials

Retrospective, multicentre study of 622 patients (624 tumors) diagnosed with pure DCIS from 1993–2011.

Results

Most tumors (377/624; 60.4%) received a boost. At a median follow-up of 8.8 years, IBTR occurred in 64 cases (10.3%). A higher percentage of patients with risk factors for IBTR received a boost (p < 0.05). Boost was not associated with lower rates of IBTR than WBRT alone (HR 0.75, 95% CI 0.42–1.35). On the univariate analyses, IBTR was significantly associated with tumor size (11–20 mm, HR 2.32, 95% CI 1.27–4.24; and > 20 mm, HR 2.10, 95% CI 1.14–3.88), re-excision (HR 1.76, 95% CI 1.04–2.96), and tamoxifen (HR 2.03, 95% CI 1.12–3.70). Boost dose > 16 Gy had a protective effect (HR 0.39, 95% CI 0.187–0.824). Multivariate analyses confirmed the independent associations between IBTR and 11–20 mm (p = 0.02) and > 20 mm (p = 0.009) tumours, and re-excision (p = 0.006). On the margin-stratified multivariate analysis, tamoxifen was a poor prognostic factor in the close/positive margin subgroup (HR 4.28 95% CI 1.23–14.88), while the highest boost dose ( > 16 Gy) had a significant positive effect (HR 0.34, 95% CI 0.13–0.86) in the negative margin subgroup.

Conclusions

Radiotherapy boost did not improve the risk of IBTR. Boost radiotherapy was more common in patients with high-risk disease. Tumor size and re-excision were significant independent prognostic factors.

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Acknowledgements

We thank Dr. Bruno Cutuli for his helpful advice and to Bradley Londres for revising the English text. This work was supported by a grant from the Clìnic Barcelona and the Institut d’ Investigació i Innovació Parc Taulí.

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Correspondence to M. J. Cambra.

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All procedures performed were in accordance with the ethical standards of the institutional and/or national Research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Institutional review board approval and data sharing agreements were obtained from all participating institutions. All data were anonymized.

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Preliminary results from this study have been presented at the XVIII Congress of the Spanish Society of Radiation Oncology in Valencia, Spain (June, 2015); at the European Cancer Congress in Vienna, Austria (September, 2015); and at the San Antonio Breast Cancer Symposium (December 2015).

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Cambra, M.J., Moreno, F., Sanz, X. et al. Role of boost radiotherapy for local control of pure ductal carcinoma in situ after breast-conserving surgery: a multicenter, retrospective study of 622 patients. Clin Transl Oncol 22, 670–680 (2020). https://doi.org/10.1007/s12094-019-02168-x

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