The ongoing phase Ia/Ib trial determines the safety, MTD, PK, PD and preliminary efficacy of BI 1810631 in pts with HER2 aberration-positive solid tumors (NCT04886804)....Of 24 evaluable lung cancer patients (17 are still on Tx), 11 responded (all PRs) and 12 had SD. Two patients with other tumors (esophagus; cholangiocarcinoma) also achieved PR.