Abstract
Background
Metaplastic breast cancer (MpBC) is a rare histological subtype of breast cancer recognized as a unique pathologic entity in 2000. However, the pathogenesis, optimal therapy, and prognosis of MpBC and the potential effect of systemic treatments on different subtypes of MpBC are not well defined.
Methods
A retrospective population-based study was performed to identify breast cancer patients with MpBC and other triple-negative breast cancers (TNBC) between 2010 and 2014 using the surveillance, Epidemiology, and End Results (SEER) database. Chi-square test was used to analyze characteristics between subgroups. Kaplan–Meier analysis and Multivariate Cox regressions were used to evaluate overall survival (OS) of MpBC, TNBC, and MpBC subgroups. Competing risk analysis and multivariate regression model of competing risk were used to assess breast cancer-specific survival (BCSS) of MpBC and TNBC
Results
We identified a study cohort of 22,433 patients (1112 MpBC and 21,321 TNBC). MpBC correlated with older population, larger tumor size and less lymph node involvement, and TNBC phenotype. Patients with MpBC especially with triple-negative subtype (TN-MpBC) had worse survival than the overall TNBC population. However, the prognosis of MpBC without triple-negative subtype (non-TN MpBC) was not different from that of TNBC. In Kaplan–Meier analysis, chemotherapy was not associated with significant difference in OS of TN-MpBC. In non-TN MpBC group, the 3-year OS was 79.8% for patients receiving chemotherapy and 70.5% in patients without chemotherapy, and chemotherapy was associated (P = 0.033) with improved OS. Within the MpBC patients, radiotherapy was significantly (HR 1.544; 95% CI 1.148–2.078; P = 0.004) associated with improved OS and (HR 1.474; 95% CI 1.067–2.040; P = 0.019) BCSS.
Conclusions
Patients with TN-MpBC had worse prognosis than TNBC and chemotherapy was not associated with improved survival. In contrast, non-TN MpBC may derive survival benefit from chemotherapy and radiotherapy.
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Abbreviations
- MpBC:
-
Metaplastic breast cancer
- TNBC:
-
Triple-negative breast cancer
- SEER:
-
Surveillance, Epidemiology, and End Results
- OS:
-
Overall survival
- BCSS:
-
Breast cancer-specific survival
- TN-MpBC:
-
Triple-negative subtype of MpBC
- Non-TN MpBC:
-
MpBC without triple-negative subtype
- HR:
-
Hazard ratio
- CI:
-
Confidence interval
- IDC:
-
Invasive ductal carcinoma, no special type
- ER:
-
Estrogen receptor
- PR:
-
Progesterone receptor
- HER2:
-
Human epidermal growth factor receptor 2
- ICD-0-3:
-
International Classification of Diseases for Oncology Version 3
- TNBC:
-
Triple-negative subtype of IDC
- CT:
-
Chemotherapy
- RT:
-
Radiotherapy
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Acknowledgements
Dr. F. Esteva is partially supported by Breast Cancer Research Foundation. Dr. S. Yeung is partially supported by DepoMed, Inc. and Bristol-Myers Squibb. The University of Texas MD Anderson Cancer Center is supported in part by the National Institutes of Health through Cancer Center Support Grant P30 CA016672.
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Dr. Yeung is the principal investigator of an investigator-initiated clinical trial supported by DepoMed and a retrospective clinical study supported by Bristol-Myer Squibb through ARISTA-USA (BMS/Pfizer American Thrombosis Investigator Initiated Research Program). The support granted by commercial companies was not used in support of the current study. All other authors declare no competing financial or non-financial interests.
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He, X., Ji, J., Dong, R. et al. Prognosis in different subtypes of metaplastic breast cancer: a population-based analysis. Breast Cancer Res Treat 173, 329–341 (2019). https://doi.org/10.1007/s10549-018-5005-6
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DOI: https://doi.org/10.1007/s10549-018-5005-6