A First-in-human Study of IBI343 in Subjects With Locally Advanced Unresectable or Metastatic Solid Tumors

This is a Phase Ia/Ib, multicenter, open-label, first-in-human study to evaluate the safety, tolerability, PK, and efficacy of IBI343 in participants with locally advanced unresectable or metastatic solid tumors. It is planned to be carried out in different countries or regions such as China, Australia and US. There are three parts in phase Ia. Part 1 includes dose escalation and expansion phase and part 2 is designed for dose optimization for IBI343 monotherapy. Part 3 1L G/GEJ AC and 1L PDAC cohorts will include an initial safety lead-in stage to confirm the tolerability of IBI343 in combination with chemotherapy in 1L PDAC and G/GEJ AC, followed by a randomized dose-optimization stage designed to further characterize safety, pharmacokinetics, and preliminary efficacy to inform selection of the recommended Phase 3 dose.