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KMID : 1188520150110010012
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Korean Journal of Clinical Oncology
2015 Volume.11 No. 1 p.12 ~ p.19
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Expression of growth factor receptor family before and after targeted therapy in human epidermal growth factor receptor-2 positive breast cancer tissues
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Park Se-Ho
Ko Young-Sin
Koo Ja-Seung
Sohn Joo-Hyuk
Kim Seung-Il
Park Byeong-Woo
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Abstract
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Purpose: This study aimed to compare expression of human epidermal growth factor receptor (HER) family and insulin-like growth factor-1 receptor (IGF-1R) before and after targeted therapy in HER-2 positive breast cancers.
Methods: Epidermal growth factor receptor (EGFR), HER-3, HER-4, and IGF-1R were immunohistochemically determined using pairwise archives tumor blocks of 28 patients received chemotherapy and HER-2 directed therapy between January 2007 and December 2011. Of them, 5 good responders achieved a pathologic complete response after neoadjuvant therapy and 23 poor responders experienced disease progression or metastasis even HER-2 targeted therapy. Expression of biomarkers was compared using chi-square test.
Results: Stage II, III, and IV was 14 (50.0%), 11 (39.3%), and 3 (10.7%) patients, respectively. Hormone receptors-positive tumors were 15 (53.6%) patients and 9 (32.1%) patients received tyrosine kinase inhibitors with or without trastuzumab. Positive expression of initial EGFR, HER-3, HER-4, and IGF-1R was determined in 15 (53.6%), 11 (39.3%), 22 (78.6%), and 14 (50.0%) patients, respectively. Although there was no statistical significance, good responders showed a higher proportion of positive HER-3 expression. Among 23 poor responders, growth factor receptors family expression showed a trend of concordant results, however, unpredictively certain patients demonstrated discordant results between before and after targeted therapy.
Conclusion: Unpredicted correlation of growth factor receptors family expression suggested that complex and personalized resistance mechanisms may be involved to HER-2 directed therapy. However, HER-3 expression might be associated with responsiveness to HER-2 targeted therapy. It would be important to develop diagnostic and therapeutic strategies for overcoming resistance to HER-2 targeted therapy.
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KEYWORD
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Breast neoplasm, Drug resistance, Epidermal growth factor receptor, Insulin like growth factor I receptor, Molecular targeted therapy
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