This study will evaluate the efficacy and safety of I-DXd in participants with recurrent or metastatic solid tumors. The study will be divided into 3 parts: Stage 1, Stage 2 and an optional Stage 3. Each cohort starts with Stage 1 and may continue to Stage 2 if sufficient safety and efficacy data are observed. The EC cohort may proceed to an optional Stage 3 expansion based on the totality of available data.
The HCC Safety Run-In (Phase 1) will assess the safety and tolerability of I-DXd in participants with HCC.