Abstract
Purpose
Hormone receptor-positive (HR+) and human epidermal growth factor receptor 2 negative (HER2−) early breast cancer (BC) is the most prevalent BC subtype with substantial biological heterogeneity. Although clinicopathological (CP) characteristics have a clear prognostic value, additional biomarkers could refine survival prediction and guide treatment decision.
Methods
Copy number aberrations and somatic driver mutations were obtained with OncoScan CGH array and sequencing of 36 genes on HR+/HER2− node-positive early BC patients treated with chemotherapy from the PACS04 trial. We built a two-gene genomic score (GS) associated with distant disease-free survival (DDFS), whose prognostic value was assessed on the external METABRIC data (n = 1413) using overall survival (OS) and breast cancer-specific survival (BCSS).
Results
In the PACS04 trial (n = 327), the median follow-up for DDFS (65 events) was 9.6 years. FGFR1 amplifications (\({\text{HR}}_{\text{Amplification}}\) = 2.44, 95% CI [1.25; 4.76], p = 0.009) and MAP3K1 mutations (\({\text{HR}}_{\text{Mutation}}\) = 0.10, [0.01; 0.78], p = 0.03) were associated with DDFS beyond CP characteristics. A prognostic GS combining FGFR1 amplifications and MAP3K1 mutations added more information to CP model (\(\chi_{\text{DDFS}}^{2}\) = 12.97, \(p_{\text{DDFS}}\) < 0.001 and \(\chi_{\text{OS}}^{2}\) = 11.52, \(p_{\text{OS}}\) < 0.001). In the METABRIC study (n = 1413), FGFR1 amplifications (\({\text{HR}}_{\text{Amplification}}\) = 2.00 [1.40; 2.87], p < 0.001) and MAP3K1 mutations (\({\text{HR}}_{\text{Mutation}}\) = 0.58 [0.41; 0.83], p = 0.003) were significantly associated with BCSS beyond CP characteristics. The prognostic GS added significant prognostic information to CP model (\(\chi_{\text{BCSSS}}^{2}\) = 15.39, \(p_{\text{BCSS}}\) < 0.001 and \(\chi_{\text{OS}}^{2}\) = 5.62, \(p_{\text{OS}}\) = 0.02).
Conclusion
In axillary node-positive, HR+, and HER2− early BC, amplifications of FGFR1 gene were strongly associated with increased risk for distant disease, while mutations of MAP3K1 gene were significantly associated with decreased risk.
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Acknowledgements
We thank Yuki Takahashi for some editorial assistance.
Funding
This study was funded by grants from ANR and CGI (RHU MyPROBE and ANR-17-RHUS-0008) and Inca (PAIR SEIN14-049 IDF-ANDRE).
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All procedures performed in studies involving human participants 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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Informed consent was obtained from all individual participants included in the PACS04 study.
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Carene, D., Tran-Dien, A., Lemonnier, J. et al. Association between FGFR1 copy numbers, MAP3K1 mutations, and survival in axillary node-positive, hormone receptor-positive, and HER2-negative early breast cancer in the PACS04 and METABRIC studies. Breast Cancer Res Treat 179, 387–401 (2020). https://doi.org/10.1007/s10549-019-05462-y
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DOI: https://doi.org/10.1007/s10549-019-05462-y