Over 70% of patients whose lung cancers harbor specific mutations within the exons encoding the tyrosine kinase domain of the epidermal growth factor receptor (EGFR) experience radiographic responses to the selective EGFR tyrosine kinase inhibitors (TKIs), gefitinib (Iressa) or erlotinib (Tarceva). However, after about one year, these patients develop progression of disease. No targeted therapy has proven clinically effective in treating acquired resistance. In the previously funded period, we identified several mechanisms of acquired resistance, including second-site EGFR mutations (>50% of cases) and amplification of the gene encoding the MET tyrosine kinase (up to 20% of cases). Using mouse models of lung cancer that we generated and characterized, we also showed that the most common form of resistance, mediated by the EGFR T790M mutation, could be overcome by a novel combination of the second-generation EGFR TKI, afatinib (BIBW2992), and the anti-EGFR antibody, cetuximab. A Phase IB/II clinical trial of this combination in humans has now shown unprecedented activity in this patient cohort with a 36% (8 of 22) radiographic response rate. However, at least one patient on this combination has already developed progressive disease, and surprisingly, some tumors without T790M have also responded. The overall goals of this revised proposal are to use human tumor specimens and cell lines, genetically engineered and xenograft mouse models, and various molecular and biochemical techniques to gain further knowledge about the subset of EGFR mutant harboring lung cancers that develop acquired resistance to EGFR inhibition. An improved understanding of acquired resistance will hopefully allow us to treat/suppress the development of progressive disease and provide new insights into the biology of cancers driven by EGFR or other mutant receptor tyrosine kinases.
A new clinical trial involving two targeted agents (afatinib plus cetuximab) was rationally designed based upon findings from our previous funding period and has now shown unprecedented anti-tumor activity in patients with acquired resistance to EGFR tyrosine kinase inhibitors in lung cancer. The goal of this grant is to gain further knowledge about the subset of EGFR mutant harboring lung cancers that develop acquired resistance to EGFR inhibition. An improved understanding of acquired resistance will hopefully allow us to treat/suppress the development of progressive disease and provide new insights into the biology of cancers driven by EGFR or other mutant receptor tyrosine kinases.
|Pirazzoli, Valentina; Nebhan, Caroline; Song, Xiaoling et al. (2014) Acquired resistance of EGFR-mutant lung adenocarcinomas to afatinib plus cetuximab is associated with activation of mTORC1. Cell Rep 7:999-1008|
|Haq, Rizwan; Fisher, David E; Widlund, Hans R (2014) Molecular pathways: BRAF induces bioenergetic adaptation by attenuating oxidative phosphorylation. Clin Cancer Res 20:2257-63|
|Cross, Darren A E; Ashton, Susan E; Ghiorghiu, Serban et al. (2014) AZD9291, an irreversible EGFR TKI, overcomes T790M-mediated resistance to EGFR inhibitors in lung cancer. Cancer Discov 4:1046-61|
|Wang, Zuoyun; Sun, Yihua; Gao, Bin et al. (2014) Two co-existing germline mutations P53 V157D and PMS2 R20Q promote tumorigenesis in a familial cancer syndrome. Cancer Lett 342:36-42|
|Politi, Katerina; Gettinger, Scott (2014) Perfect ALKemy: optimizing the use of ALK-directed therapies in lung cancer. Clin Cancer Res 20:5576-8|
|Meador, Catherine B; Micheel, Christine M; Levy, Mia A et al. (2014) Beyond histology: translating tumor genotypes into clinically effective targeted therapies. Clin Cancer Res 20:2264-75|
|Lovly, Christine M; McDonald, Nerina T; Chen, Heidi et al. (2014) Rationale for co-targeting IGF-1R and ALK in ALK fusion-positive lung cancer. Nat Med 20:1027-34|
|Yu, Helena A; Riely, Gregory J; Lovly, Christine M (2014) Therapeutic strategies utilized in the setting of acquired resistance to EGFR tyrosine kinase inhibitors. Clin Cancer Res 20:5898-907|
|Red Brewer, Monica; Yun, Cai-Hong; Lai, Darson et al. (2013) Mechanism for activation of mutated epidermal growth factor receptors in lung cancer. Proc Natl Acad Sci U S A 110:E3595-604|
|Ohashi, Kadoaki; Maruvka, Yosef E; Michor, Franziska et al. (2013) Epidermal growth factor receptor tyrosine kinase inhibitor-resistant disease. J Clin Oncol 31:1070-80|
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