Abstract
Background
Determining the indications for adjuvant chemotherapy (CT) in patients with hormone receptor (HR)-positive/HER2-negative breast cancer are difficult. The transcription factors GATA-binding protein 3 (GATA-3) and Forkhead-box protein A1 (FOXA1) are crucial for the hormone responsive phenotype of breast cancer. This study evaluated whether the expression of GATA-3 and FOXA1 is a prognostic and predictive marker of outcomes in patients with HR-positive/HER2-negative breast cancer.
Methods
The expression of GATA-3 and FOXA1 was analyzed immunohistochemically in 214 patients with invasive breast cancer to evaluate the association with the clinicopathological features and the prognosis.
Results
GATA-3 expression was positively correlated with FOXA1 expression (P < 0.0001). Both GATA-3 and FOXA1 were positively correlated with ER (P < 0.0001 each) and PR expression (P = 0.0001 and P = 0.0009, respectively), and inversely correlated with nuclear grade (P = 0.0002 and P = 0.0018, respectively) and Ki67 index (P = 0.0052 and P = 0.0049, respectively). Expression of GATA-3 and FOXA1 was associated with better prognosis. FOXA1 was an independent favorable prognostic marker in HR-positive/HER2-negative breast cancer. Disease-free survival rates were similar in patients with HR-positive/HER2-negative breast cancer and high FOXA1 expression given adjuvant hormone therapy (HT) alone and those given CT plus HT.
Conclusion
GATA-3 and FOXA1 are associated with a less aggressive phenotype and a better prognosis in patients with HR-positive/HER2-negative breast cancer. FOXA1 may be useful in identifying those patients who may not require adjuvant CT.
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Acknowledgments
This study was supported by grants from the Ministry of Education, Culture, Sports Science, and Technology of Japan (Grant No. 23591896). We are grateful to Ms. Yuko Kubota for her valuable technical assistance.
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The authors have no conflict of interest to declare.
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Hisamatsu, Y., Tokunaga, E., Yamashita, N. et al. Impact of GATA-3 and FOXA1 expression in patients with hormone receptor-positive/HER2-negative breast cancer. Breast Cancer 22, 520–528 (2015). https://doi.org/10.1007/s12282-013-0515-x
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DOI: https://doi.org/10.1007/s12282-013-0515-x