Abstract
Purpose
Epidermal growth factor (EGF) is a ligand for the epidermal growth factor receptor (EGFR). Human epidermal growth factor receptor 2 (HER2) shares common signal pathways and forms a heterodimer with EGFR. In this study, we investigated the clinical and pathologic implications of serum EGF levels in patients with HER2-positive metastatic breast cancer (MBC).
Methods
We analyzed serum EGF levels from baseline serum samples of consecutive patients with HER2-positive MBC who received first-line trastuzumab plus taxane chemotherapy and correlated them with treatment outcomes and pathologic features.
Results
A total of 50 women were analyzed. The median age was 47 years (range 27–72 years). Patients with high serum EGF levels (≥10.0 pg/mL) had significantly longer overall survival (47.0 months (95 % confidence interval (CI) 28.3–65.7 months) vs. 23.3 months (95 % CI 13.5–33.1 months); p = 0.009) with a tendency toward longer progression-free survival (p = 0.123). Serum EGF levels were not associated with hematologic or cardiac adverse events. Progesterone receptor-positive patients had significantly higher serum EGF levels than progesterone receptor-negative patients (24.3 pg/mL (range 9.5–69.0 pg/mL) vs. 12.3 pg/mL (range 0.0–59.5 pg/mL); p = 0.006).
Conclusions
Our data suggest that high serum EGF levels may be associated with good prognosis in patients with HER2-positive MBC receiving trastuzumab plus taxane chemotherapy. In addition, serum EGF levels were associated with progesterone receptor positivity.
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Acknowledgments
This research was supported by grants from the Seoul National University Hospital Research Fund (04-2009-0270); the Priority Research Centers Program (2009-0093820) and the Basic Science Research Program (2010-0022299) through the National Research Foundation (NRF) funded by the Ministry of Education, Science, and Technology, Korea.
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Kim, JW., Kim, J.H., Im, SA. et al. Serum epidermal growth factor is associated with prognosis and hormone receptor status in patients with HER2-positive metastatic breast cancer treated with first-line trastuzumab plus taxane chemotherapy. Cancer Chemother Pharmacol 72, 1023–1029 (2013). https://doi.org/10.1007/s00280-013-2268-9
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DOI: https://doi.org/10.1007/s00280-013-2268-9