This study will initially randomize participants to one of 2 arms in a 1:1 ratio to receive either a 5.6 mg/kg fixed dose regimen or an up-titration dose regimen of patritumab deruxtecan (HER3-DXd, U3-1402).
This study is designed to evaluate the antitumor activity of patritumab deruxtecan in participants with metastatic or locally advanced NSCLC with an activating EGFR mutation (exon 19 deletion or L858R) who have received and progressed on or after at least 1 EGFR TKI and 1 platinum-based chemotherapy-containing regimen.