MARIPOSA: phase 3 study of first-line amivantamab + lazertinib versus osimertinib in EGFR-mutant non-small cell lung cancer

Third-generation EGFR tyrosine kinase inhibitors (TKIs), such as osimertinib, have demonstrated efficacy in patients with EGFR-mutant non-small cell lung cancer; however, almost all patients will eventually relapse. Amivantamab is an EGFR-MET bispecific antibody with immune cell-directing activity that targets activating and resistance EGFR mutations and MET mutations and amplifications. In the ongoing CHRYSALIS study (NCT02609776), amivantamab in combination with lazertinib, a potent, brain-penetrant third-generation EGFR TKI, demonstrated antitumor activity in the treatment-naïve and osimertinib-relapsed setting. Here the authors present the methodology for the MARIPOSA study (NCT04487080), a phase 3, multicenter, randomized study designed to compare the efficacy and safety of amivantamab and lazertinib combination therapy versus single-agent osimertinib as first-line treatment for EGFR-mutant non-small cell lung cancer.