Patients with HER2 aberration-positive (overexpression, gene amplification/rearrangements, or somatic mutation) advanced/unresectable/metastatic solid tumors refractory/unsuitable for standard therapy were enrolled. Patients received escalating doses of BI 1810631 BID...These preliminary data indicate that BI 1810631 is well tolerated and shows strong efficacy signals across all dose levels in patients with pre-treated HER2 aberration-positive solid tumors.