Targeting EGFR Exon 20 Insertion Mutation in Non–small cell Lung Cancer: Amivantamab and Mobocertinib

Annals of Pharmacotherapy, Ahead of Print.
ObjectiveTo evaluate clinical data regarding the use of amivantamab and mobocertinib for epidermal growth factor receptor (EGFR) exon 20 insertion mutation non–small cell lung cancer (NSCLC) and assess their potential impact on the care of patients.Data SourcesA comprehensive literature search of PubMed and Clinicaltrials.gov was conducted using the terms amivantamab, Rybrevant, JNJ-61186372, mobocertinib, Exkivity, TAK-788.Study Selection and Data ExtractionRelevant English-language clinical trials were evaluated.Data SynthesisAmivantamab and mobocertinib were Food and Drug Administration (FDA) approved based on phases 1 and 2 studies. Amivantamab demonstrated an overall response rate (ORR) of 40% and median progression-free survival (PFS) of 8.3 months. Patients commonly experienced rash (86%), paronychia (45%), and stomatitis (21%). Mobocertinib demonstrated an ORR of 28% and median PFS of 7.3 months in phase 1/2 study. Patients frequently experienced diarrhea (91%), rash (45%), and paronychia (38%). Cardiac monitoring is recommended with mobocertinib due to risk of QTc prolongation and cardiac failure.Relevance to Patient CareFor NSCLC patients who possess an EGFR exon 20 insertion mutation, amivantamab and mobocertinib are indicated as second-line therapy. Ongoing studies are evaluating these therapies as first-line monotherapy and as part of combination regimens in multiple cancer types. Dosage forms, drug interactions, and patient comorbidities should be considered when deciding which of the 2 agents may be most appropriate.ConclusionAmivantamab and mobocertinib target an uncommon NSCLC mutation that has historically marked a poor prognosis because of innate resistance to previously approved EGFR tyrosine kinase inhibitors. Promising results from early phase trials supported accelerated FDA approval.