Abstract
Purpose
We aimed to explore the expression of DNA damage response machinery proteins and their integrated prognostic value in different subgroups of breast cancer.
Methods
Expression of NBS1, BRCA1, BRCA2, ATM, and p53 was determined by immunohistochemistry in 419 surgically resected breast tumors.
Results
Loss of NBS1, BRCA1, ATM, and abnormal p53 expression was significantly associated with lower disease-free survival rates. Abnormal DNA damage response protein expression, defined as loss of any one of NBS1, BRCA1, ATM, and/or abnormal p53 expression, was observed in 258 of 399 evaluable cases (64.7%) and was significantly associated with higher tumor grade, larger tumor size, and ER-negative, and/or PR-negative status. Most patients with luminal B (86.1%), HER2-enriched (94.4%), and triple-negative (86.8%) breast cancers had abnormal DNA damage response protein expression. In contrast, abnormal DNA damage response protein expression was found in only 53.8% of luminal A tumors. Abnormal DNA damage response protein expression was associated with significantly lower 5-year disease-free survival rates in all patients (95.6% vs. 84.8%, p = 0.001), as well as in the luminal A subgroup (97.4% vs. 89.0%, p = 0.011). In multivariate analysis, abnormal DNA damage response protein expression remained an independent predictor of shorter disease-free survival for luminal A subtype (hazard ratio 3.14, 95% confidence interval 1.16–8.47; p = 0.024).
Conclusion
Abnormal DNA damage response protein expression is found in most luminal B and HER2-enriched breast cancers as frequently as in triple-negative breast cancer. In the luminal A subtype, abnormal DNA damage response protein expression is an independent prognostic marker.
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Acknowledgements
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT, and Future Planning (2015R1A2A2A01004655; to S.-A. Im). This work was also funded by a Grant from the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (HI14C1277; to S.-A. Im), and was supported in part by Grant No. 04-2014-0570 from the Seoul National University Hospital Research Fund.
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Suh, K.J., Ryu, H.S., Lee, KH. et al. Prognostic effects of abnormal DNA damage response protein expression in breast cancer. Breast Cancer Res Treat 175, 117–127 (2019). https://doi.org/10.1007/s10549-019-05128-9
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DOI: https://doi.org/10.1007/s10549-019-05128-9