Bahcall, Magda Sim, Taebo Paweletz, Cloud P. Patel, Jyoti D. Alden, Ryan S. Kuang, Yanan Sacher, Adrian G. Kim, Nam Doo Lydon, Christine A. Awad, Mark M. Jaklitsch, Michael T. Sholl, Lynette M. Jaenne, Pasi A. Oxnard, Geoffrey R. 2024-01-20T02:34:31Z 2024-01-20T02:34:31Z 2021-09-05 2016-12 2159-8274 https://pubs.kist.re.kr/handle/201004/123365 Amplified and/or mutated MET can act as both a primary oncogenic driver and as a promoter of tyrosine kinase inhibitor (TKI) resistance in non-small cell lung cancer (NSCLC). However, the landscape of MET-specific targeting agents remains underdeveloped, and understanding of mechanisms of resistance to MET TKIs is limited. Here, we present a case of a patient with lung adenocarcinoma harboring both a mutation in EGFR and an amplification of MET, who after progression on erlotinib responded dramatically to combined MET and EGFR inhibition with savolitinib and osimertinib. When resistance developed to this combination, a new MET kinase domain mutation, D1228V, was detected. Our in vitro findings demonstrate that MET D1228V induces resistance to type I MET TKIs through impaired drug binding, while sensitivity to type II MET TKIs is maintained. Based on these findings, the patient was treated with erlotinib combined with cabozantinib, a type II MET inhibitor, and exhibited a response. SIGNIFICANCE: With several structurally distinct MET inhibitors undergoing development for treatment of NSCLC, it is critical to identify mechanism-based therapies for drug resistance. We demonstrate that an acquired METD1228V mutation mediates resistance to type I, but not type II, MET inhibitors, having therapeutic implications for the clinical use of sequential MET inhibitors. English AMER ASSOC CANCER RESEARCH TYROSINE KINASE ACTIVATING MUTATIONS PHASE-III SOMATIC MUTATIONS PLUS ERLOTINIB DOUBLE-BLIND CRIZOTINIB MUTANT AMPLIFICATION PATIENT Acquired METD1228V Mutation and Resistance to MET Inhibition in Lung Cancer Article 10.1158/2159-8290.CD-16-0686 1 CANCER DISCOVERY, v.6, no.12, pp.1334 - 1341 CANCER DISCOVERY 6 12 1334 1341 scie scopus 000390252900022 2-s2.0-85007401698 Oncology Oncology Article TYROSINE KINASE ACTIVATING MUTATIONS PHASE-III SOMATIC MUTATIONS PLUS ERLOTINIB DOUBLE-BLIND CRIZOTINIB MUTANT AMPLIFICATION PATIENT c-Met