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Tumor Biology |
Departments of Medicine [H. K., A. E. G. L., J. T. F., C. L. A.], Cell Biology [C. L. A.], and Pathology [J. F. S., J. T. F.], Vanderbilt University School of Medicine, Department of Veteran Affairs Medical Center [C. L. A.] and Vanderbilt-Ingram Cancer Center [J. F. S., C. L. A.], Nashville, Tennessee 37232, and Genentech, Inc. South San Francisco, California 94080 [P. I. P., M. X. S.]
HER2/neu (erbB-2) overexpression has been causally associated with tamoxifen resistance in human breast cancer cells. Forced expression of HER2 in MCF-7 breast cancer cells resulted in mitogen-activated protein kinase (MAPK) hyperactivity and tamoxifen resistance. Inhibition of HER2 and MAPKs with AG1478 and U0126, respectively, as well as dominant-negative MEK-1/2 constructs restored the inhibitory effect of tamoxifen on estrogen receptor (ER)-mediated transcription and cell proliferation. Both AG1478 and U0126 also restored the tamoxifen-mediated association of ER with nuclear receptor corepressor (N-CoR) in the antiestrogen-resistant MCF-7 cells. Treatment with a combination of tamoxifen and a HER2 kinase inhibitor reduced tumor MAPK activity and markedly prevented growth of HER2-overexpressing MCF-7 xenografts in athymic mice. Thus, blockade of HER2 and MAPK signaling may enhance tamoxifen action and abrogate antiestrogen resistance in human breast cancer.
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S. R. Johnston Combinations of Endocrine and Biological Agents: Present Status of Therapeutic and Presurgical Investigations Clin. Cancer Res., January 15, 2005; 11(2): 889s - 899s. [Abstract] [Full Text] [PDF] |
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I. Chu, K. Blackwell, S. Chen, and J. Slingerland The Dual ErbB1/ErbB2 Inhibitor, Lapatinib (GW572016), Cooperates with Tamoxifen to Inhibit Both Cell Proliferation- and Estrogen-Dependent Gene Expression in Antiestrogen-Resistant Breast Cancer Cancer Res., January 1, 2005; 65(1): 18 - 25. [Abstract] [Full Text] [PDF] |
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Y. Sun and F. A. Sinicrope Selective inhibitors of MEK1/ERK44/42 and p38 mitogen-activated protein kinases potentiate apoptosis induction by sulindac sulfide in human colon carcinoma cells Mol. Cancer Ther., January 1, 2005; 4(1): 51 - 59. [Abstract] [Full Text] [PDF] |
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L. A. deGraffenried, W. E. Friedrichs, D. H. Russell, E. J. Donzis, A. K. Middleton, J. M. Silva, R. A. Roth, and M. Hidalgo Inhibition of mTOR Activity Restores Tamoxifen Response in Breast Cancer Cells with Aberrant Akt Activity Clin. Cancer Res., December 1, 2004; 10(23): 8059 - 8067. [Abstract] [Full Text] [PDF] |
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G. Arpino, S. J. Green, D. C. Allred, D. Lew, S. Martino, C. K. Osborne, and R. M. Elledge HER-2 Amplification, HER-1 Expression, and Tamoxifen Response in Estrogen Receptor-Positive Metastatic Breast Cancer: A Southwest Oncology Group Study Clin. Cancer Res., September 1, 2004; 10(17): 5670 - 5676. [Abstract] [Full Text] [PDF] |
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L. Zhu, L. W. C. Chow, W. T. Y. Loo, X.-Y. Guan, and M. Toi Her2/neu Expression Predicts the Response to Antiaromatase Neoadjuvant Therapy in Primary Breast Cancer: Subgroup Analysis from Celecoxib Antiaromatase Neoadjuvant Trial Clin. Cancer Res., July 15, 2004; 10(14): 4639 - 4644. [Abstract] [Full Text] [PDF] |
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J. V. Thottassery, Y. Sun, L. Westbrook, S. S. Rentz, M. Manuvakhova, Z. Qu, S. Samuel, R. Upshaw, A. Cunningham, and F. G. Kern Prolonged Extracellular Signal-Regulated Kinase 1/2 Activation during Fibroblast Growth Factor 1- or Heregulin {beta}1-Induced Antiestrogen-Resistant Growth of Breast Cancer Cells Is Resistant to Mitogen-Activated Protein/Extracellular Regulated Kinase Kinase Inhibitors Cancer Res., July 1, 2004; 64(13): 4637 - 4647. [Abstract] [Full Text] [PDF] |
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J. Shou, S. Massarweh, C. K. Osborne, A. E. Wakeling, S. Ali, H. Weiss, and R. Schiff Mechanisms of Tamoxifen Resistance: Increased Estrogen Receptor-HER2/neu Cross-Talk in ER/HER2-Positive Breast Cancer J Natl Cancer Inst, June 16, 2004; 96(12): 926 - 935. [Abstract] [Full Text] [PDF] |
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M. Ellis Overcoming Endocrine Therapy Resistance by Signal Transduction Inhibition Oncologist, June 3, 2004; 9(suppl_3): 20 - 26. [Abstract] [Full Text] [PDF] |
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Z. Yang, C. J. Barnes, and R. Kumar Human Epidermal Growth Factor Receptor 2 Status Modulates Subcellular Localization of and Interaction with Estrogen Receptor {alpha} in Breast Cancer Cells Clin. Cancer Res., June 1, 2004; 10(11): 3621 - 3628. [Abstract] [Full Text] [PDF] |
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W. Tangkeangsirisin, J. Hayashi, and G. Serrero PC Cell-Derived Growth Factor Mediates Tamoxifen Resistance and Promotes Tumor Growth of Human Breast Cancer Cells Cancer Res., March 1, 2004; 64(5): 1737 - 1743. [Abstract] [Full Text] [PDF] |
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A. Argiris, C.-X. Wang, S. G. Whalen, and M. P. DiGiovanna Synergistic Interactions between Tamoxifen and Trastuzumab (Herceptin) Clin. Cancer Res., February 15, 2004; 10(4): 1409 - 1420. [Abstract] [Full Text] [PDF] |
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R. Schiff, S. A. Massarweh, J. Shou, L. Bharwani, S. K. Mohsin, and C. K. Osborne Cross-Talk between Estrogen Receptor and Growth Factor Pathways as a Molecular Target for Overcoming Endocrine Resistance Clin. Cancer Res., January 1, 2004; 10(1): 331S - 336S. [Abstract] [Full Text] [PDF] |
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