Amivantamab in Participants With Advanced NSCLC and MET Exon 14 Skipping Mutations: Final Results From the CHRYSALIS Study

J Thorac Oncol. 2025 Sep;20(9):1289-1301. doi: 10.1016/j.jtho.2025.05.012. Epub 2025 May 16.

Abstract

Introduction: Amivantamab is an EGFR-MET bispecific antibody with immune cell-directing activity. We assessed the safety and efficacy of amivantamab in participants with advanced NSCLC harboring primary MET exon 14 skipping mutations (METex14).

Methods: CHRYSALIS enrolled participants with METex14 NSCLC who progressed after or declined standard-of-care therapy. Participants received intravenous amivantamab weekly for 4 weeks and biweekly thereafter. Objective response rate, duration of response (DoR), clinical benefit rate, progression-free survival, overall survival, safety, and circulating tumor DNA were analyzed.

Results: Among 97 participants, 16 were treatment naive, 28 received prior treatment without MET therapies, and 53 received prior MET therapies. Objective response rate was 32% overall, 50% in treatment-naive participants, 46% in participants without prior MET therapies, and 19% in participants with prior MET therapies. In participants without prior MET therapies, amivantamab activity was observed regardless of co-occurring genomic alterations. Clinical benefit rate was 69% overall, 88% in treatment-naive participants, 64% in participants without prior MET therapies, and 66% in participants with prior MET therapies. Median DoR was 11.2 months; 61% (19/31) of the responders had DoR greater than or equal to 6 months. Median progression-free survival was 5.3 months (95% confidence interval, 4.3-7.0); median overall survival was 15.8 months (95% confidence interval, 14.6-not estimable). Most common adverse events were rash (79%) and infusion-related reactions (72%), most being grades 1 to 2 (52%).

Conclusions: The safety profile was consistent with previous reports of amivantamab in EGFR-mutant NSCLC. Amivantamab demonstrated clinically meaningful and durable antitumor activity in participants with METex14 advanced NSCLC, including those who progressed on prior MET therapies.

Keywords: Advanced non–small cell lung cancer; Amivantamab; CHRYSALIS; MET exon 14 skipping mutation; Previous MET therapies.

Publication types

  • Clinical Trial, Phase I
  • Multicenter Study

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Antibodies, Bispecific* / administration & dosage
  • Antibodies, Bispecific* / adverse effects
  • Antineoplastic Agents, Immunological / administration & dosage
  • Antineoplastic Agents, Immunological / adverse effects
  • Carcinoma, Non-Small-Cell Lung* / drug therapy
  • Carcinoma, Non-Small-Cell Lung* / genetics
  • Carcinoma, Non-Small-Cell Lung* / mortality
  • Carcinoma, Non-Small-Cell Lung* / pathology
  • Exons
  • Female
  • Humans
  • Lung Neoplasms* / drug therapy
  • Lung Neoplasms* / genetics
  • Lung Neoplasms* / mortality
  • Lung Neoplasms* / pathology
  • Male
  • Middle Aged
  • Mutation*
  • Proto-Oncogene Proteins c-met* / antagonists & inhibitors
  • Proto-Oncogene Proteins c-met* / genetics
  • Survival Rate

Substances

  • amivantamab
  • MET protein, human
  • Proto-Oncogene Proteins c-met
  • Antineoplastic Agents, Immunological
  • Antibodies, Bispecific