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Molecular Cancer Therapeutics
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EGFR/Her2

Abstract A157: Antitumor activity of tarloxotinib, a hypoxia-activated EGFR TKI, in patient-derived lung cancer cell lines harboring EGFR exon 20 insertions

Adriana Estrada-Bernal, Andrea E. Doak, Anh T. Le, Hengbo Zhu, Nan Chen, Shevan Silva, Jeff B. Smaill, Adam V. Patterson and Robert C. Doebele
Adriana Estrada-Bernal
1University of Colorado Anschutz Medical Campus, Aurora, CO;
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Andrea E. Doak
1University of Colorado Anschutz Medical Campus, Aurora, CO;
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Anh T. Le
1University of Colorado Anschutz Medical Campus, Aurora, CO;
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Hengbo Zhu
1University of Colorado Anschutz Medical Campus, Aurora, CO;
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Nan Chen
1University of Colorado Anschutz Medical Campus, Aurora, CO;
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Shevan Silva
2Maurice Wilkings Centre for Molecular Biodiscovery. University of Auckland, Auckland, New Zealand.
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Jeff B. Smaill
2Maurice Wilkings Centre for Molecular Biodiscovery. University of Auckland, Auckland, New Zealand.
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Adam V. Patterson
2Maurice Wilkings Centre for Molecular Biodiscovery. University of Auckland, Auckland, New Zealand.
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Robert C. Doebele
1University of Colorado Anschutz Medical Campus, Aurora, CO;
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DOI: 10.1158/1535-7163.TARG-17-A157 Published January 2018
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Abstracts: AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics; October 26-30, 2017; Philadelphia, PA

Abstract

Tarloxotinib (TRLX) is a prodrug that releases an irreversible EGFR/HER2 tyrosine kinase inhibitor (TRLX-TKI) under pathophysiologically hypoxic conditions. Non-small cell lung cancer (NSCLC) has been characterized as a hypoxic disease and approximately 15% of lung adenocarcinomas harbor EGFR mutations. While most EGFR mutations predict for response to several FDA-approved tyrosine kinase inhibitors, in-frame insertions in exon 20 of EGFR are activating mutations in the tyrosine kinase domain that have significantly decreased sensitivity to EGFR inhibitors and currently have no approved targeted therapies. We derived and characterized three human lung adenocarcinoma cell lines with different EGFR exon 20 insertions in order to accelerate development of targeted therapies for this mutation class. Using these novel cell lines, we evaluated tarloxotinib as a therapeutic agent for tumors harboring this type of mutations. We demonstrate that our three patient-derived cell lines: CUTO14 (p.A767_V769dupASV), CUTO17 (p.N771_H773dupNPH), and CUTO18 (p.S768_770dupSVD) are dependent on EGFR for cell proliferation using shRNA-mediated knockdown. Our results show that EGFR exon 20 insertion cell lines are resistant to gefitinib; however, treatment with afatinib or TRLX-TKI reduces cell proliferation and signaling in a similar manner. The IC50 values for the three cell lines were 203nM, 89nM, and 709 nM for afatinib and 208nM, 33nM, and 345nM for TRLX-TKI, respectively. The prodrug form of tarloxitinib has minimal effect on cell proliferation in these models, consistent with the necessity for hypoxia-induced activation (to TRLX-TKI). Importantly, we evaluated the effect of tarloxotinib in vivo using murine xenograft models of CUTO14 and CUTO17. After four weeks of treatment, afatinib did not alter tumor growth compared to untreated tumors, whereas treatment with tarloxotinib induced significant tumor regression. The in vivo data suggest that the activated TKI of tarloxitinib is accumulating to biologically active concentrations in tumors following cleavage of tarlxoxotinib under hypoxic conditions. We conclude that our EGFR exon 20 insertions cell lines represent novel models for the investigation of therapeutic strategies for this mutation class. These cell lines have the ability to develop tumors in vivo and show reduced sensitivity to current EGFR TKIs, mimicking the lack of response in patients with these mutations. Finally, we demonstrate that tarloxotinib can overcome intrinsic EGFR exon 20 mutation resistance to standard EGFR TKIs.

Citation Format: Adriana Estrada-Bernal, Andrea E. Doak, Anh T. Le, Hengbo Zhu, Nan Chen, Shevan Silva, Jeff B. Smaill, Adam V. Patterson, Robert C. Doebele. Antitumor activity of tarloxotinib, a hypoxia-activated EGFR TKI, in patient-derived lung cancer cell lines harboring EGFR exon 20 insertions [abstract]. In: Proceedings of the AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics; 2017 Oct 26-30; Philadelphia, PA. Philadelphia (PA): AACR; Mol Cancer Ther 2018;17(1 Suppl):Abstract nr A157.

  • ©2018 American Association for Cancer Research.
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Molecular Cancer Therapeutics: 17 (1 Supplement)
January 2018
Volume 17, Issue 1 Supplement
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Abstract A157: Antitumor activity of tarloxotinib, a hypoxia-activated EGFR TKI, in patient-derived lung cancer cell lines harboring EGFR exon 20 insertions
Adriana Estrada-Bernal, Andrea E. Doak, Anh T. Le, Hengbo Zhu, Nan Chen, Shevan Silva, Jeff B. Smaill, Adam V. Patterson and Robert C. Doebele
Mol Cancer Ther January 1 2018 (17) (1 Supplement) A157; DOI: 10.1158/1535-7163.TARG-17-A157

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Abstract A157: Antitumor activity of tarloxotinib, a hypoxia-activated EGFR TKI, in patient-derived lung cancer cell lines harboring EGFR exon 20 insertions
Adriana Estrada-Bernal, Andrea E. Doak, Anh T. Le, Hengbo Zhu, Nan Chen, Shevan Silva, Jeff B. Smaill, Adam V. Patterson and Robert C. Doebele
Mol Cancer Ther January 1 2018 (17) (1 Supplement) A157; DOI: 10.1158/1535-7163.TARG-17-A157
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Molecular Cancer Therapeutics
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