HERTHENA-Lung01 (ClinicalTrials.gov identifier: NCT04619004) is a multicenter, open-label, randomized, two-arm, phase II study of HER3-DXd once every 3 weeks in previously treated patients with locally advanced or metastatic NSCLC with EGFR-activating mutations (exon 19 deletion or L858R) being conducted in 122 location...HER3-DXd once every 3 weeks demonstrated clinically meaningful efficacy, including durable intracranial responses, with a manageable safety profile in patients with previously treated EGFR-mutated NSCLC.