Byoung C. Cho, M.D., Ph.D., from the Yonsei Cancer CenterCancer Center in Seoul, South Korea, and colleagues conducted a phase 3 trial involving patients with previously untreated EGFR-mutated, locally advanced or metastatic NSCLC randomly allocated to receive amivantamab-lazertinib (open-label), osimertinib (blinded), or lazertinib (blinded) in a 2:2:1 ratio (429, 429, and 216 patients, respectively).
The researchers found that the median progression-free survival was significantly longer in the amivantamab-lazertinib group than in the osimertinib group (23.7 versus 16.6 months; hazard ratio for disease progression or death, 0.70). An objective response was observed in 86 and 85 percent of patients in the amivantamab-lazertinib and osimertinib groups, respectively; among patients with a confirmed response, the median response duration was 25.8 and 16.8 months, respectively. The hazard ratio for death did not differ significantly in a planned interim overall survival analysis of amivantamab-lazertinib versus osimertinib. EGFR-related toxic effects were the predominant adverse events. The incidence of discontinuation of all agents due to treatment-related adverse events was 10 and 3 percent with amivantamab-lazertinib and osimertinib, respectively.
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