Abstract
Purpose
Recent cohort studies demonstrated better overall survival (OS) or breast cancer-specific survival (BCS) for breast-conserving therapy (BCT) followed by radiation (RT) compared to mastectomy alone (MT). This is the first observational study in which adjustments for a comprehensive set of prognostic factors, adjuvant therapies, mode of detection, and comorbidities were possible to investigate OS, BCS, as well as recurrence risk of patients undergoing BCT + RT, MT + RT, or MT.
Methods
Women aged 50–74 years at diagnosis of early-stage invasive breast cancer (I–IIIa) between 2001 and 2005 at the German population-based case–control study (MARIE study) were recruited and followed prospectively as a case cohort until 2015. Kaplan–Meier estimates and stepwise adjusted multivariable Cox models were used to estimate hazard ratios (HRs) and 95% confidence intervals (95% CI).
Results
The 2762 patients included were followed up for a median of 11.9 years (95% CI 11.8–12.0). 74.2% of patients underwent BCT + RT; 10.3% MT + RT and 15.6% MT alone. Compared to patients treated with MT alone, patients treated with BCT + RT showed non-statistically significant improved OS (HR 0.79, 95% CI 0.61–1.02), BCS (HR 0.79, 95% CI 0.55–1.12), and no difference in recurrence risks (HR 1.01, 95% CI 0.74–1.37). For patients treated with MT + RT, there were no differences in OS (HR 1.06, 95% CI 0.75–1.50), BCS (HR 1.17, 95% CI 0.75–1.82), or recurrence risk (HR 1.33, 95% CI 0.89–1.97).
Conclusions
Among patients with early-stage breast cancer, clinical outcomes more than 10 years after diagnosis did not differ between the primary treatment options BCT + RT, MT + RT versus MT alone after full adjustment.
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Abbreviations
- BCS:
-
Breast cancer-specific survival
- BCT:
-
Breast-conserving therapy
- CVD:
-
Cardiovascular disease
- ER/PR receptor:
-
Estrogen/progesterone receptor
- HR:
-
Hazard ratio
- ICD-10-GM:
-
International classification of diseases, 10th revision
- MT:
-
Mastectomy
- OS:
-
Overall survival
- RT:
-
Radiation
- RCT:
-
Randomized clinical trials
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Acknowledgements
We are grateful to all MARIE study participants. We also thank U. Eilber, S. Behrens, J. Mertin, J. Roczen, and T. Olchers for most valuable technical assistance and data management. The MARIE, MARIEplus, and MARIEplus2 study were funded by the Deutsche Krebshilfe e.V. (#70-2892-BR I, #108253 and #108419, #70110826 and #70112562).
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Thöne, K., Rudolph, A., Obi, N. et al. Prognostic impact of surgery for early-stage invasive breast cancer on breast cancer-specific survival, overall survival, and recurrence risk: a population-based analysis. Breast Cancer Res Treat 170, 381–390 (2018). https://doi.org/10.1007/s10549-018-4754-6
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DOI: https://doi.org/10.1007/s10549-018-4754-6