A Multicentre,Study of IBI133 in Subjects WithUnresectable, Locally Advanced or Metastatic SolidTumours

A Multicentre, Open-label, Phase 1/2 Study of IBI133 in Subjects With Unresectable, Locally Advanced or Metastatic Solid Tumours

This is a multicentre, open-label, first-in-human, phase 1/2 study of IBI133 in subjects with unresectable, locally advanced or metastatic solid tumours. Phase 1 section includes three parts, IBI133 dose escalation part, and IBI133 monotherapy dose expansion part. The objective of phase 1 section is to identify MTD/recommended dose for expansion (RDE) of IBI133 monotherapy . The objective of phase 2 section is to further explore efficacy, safety and tolerability of IBI133 monotherapy at RDE in specified tumour population. The treatment cycle of the study is defined as every 3 weeks (21 days).

Inclusion Criteria:

1. Subjects with the ability to understand and give written informed consent for participation in this trial, including all evaluations and procedures as specified by this protocol;
2. Male or female subjects ≥ 18 years old;
3. Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 or 1;
4. Anticipated life expectancy of ≥ 12 weeks;
5. Adequate bone marrow and organ function.
6. Has a documented (histologically- or cytologically-proven), unresectable, locally advanced or metastatic solid tumour that is refractory to or intolerable with standard treatment, or for which no standard treatment is available;

Exclusion Criteria:

1. Participate in any other interventional clinical research except observational (non-interventional) study or in the follow-up phase of the interventional study;
2. Prior HER3 targeted treatment, including but not limited to monoclonal antibody, bispecific antibody, T cell engager, and antibody-drug conjugate.
3. Prior treatment with an antibody-drug conjugate (ADC) which consists of an exatecan derivative that is a topoisomerase I inhibitor (e.g. DS-8201).