At the Mar 26, 2021, data cutoff, 47 pts had been treated with HER3-DXd 5.6 mg/kg IV every 3 wk; 17 pts had an identified driver genomic alteration (4 KRAS and 1 NRAS mutations, 4 EGFR Ex20ins, 3 ROS1 and 2 ALK fusions, and 3 other)....Among pts with identified driver genomic alterations, 35% (6/17) had a confirmed response by BICR, including 3 of 5 pts with KRAS/NRAS mutations...