A Phase Ia/Ib Clinical Trial of IBI360 Monotherapy or in Combination With Sintilimab and (or) Chemotherapy in Advanced or Metastatic Solid Tumors

Inclusion Criteria:

1. Provide signed informed consent;
2. Male or female aged at 18-75 (inclusive) years;
3. Expected survival ≥12 weeks;
4. ECOG PS score 0 or 1;
5. Provide archival or fresh tissues for CLDN18.2 expression analysis;
6. Adequate laboratory parameters;
7. Suffer from advanced or metastatic malignant local solid tumors confirmed by histological diagnosis and meet the criteria of the enrolled group as follows:

Ia: The subjects for whom no standard treatment regimens are available or who is intolerable to standard treatments.

Ib: pancreatic carcinoma, HER2 negative gastric adenocarcinoma, advanced or metastatic solid tumors

Exclusion Criteria:

1. The subjects who received the treatment with CLDN18.2 monoclonal antibody or CLDN-18.2 CART;
2. The subjects who received other anti-tumor medication within 4 weeks prior to the initial dose of the study drug;
3. Any toxicity due to previous anti-tumor therapy that has not yet resolved to NCI CTCAE v5.0 grade 0 or 1 prior to the first dose of study treatment;
4. The subjects with history of hypersensitivity to the study drug;
5. The subjects were not recovery after surgery with history of gastrointestinal perforation or fistula within 6 months prior to the enrollment;
6. The subjects with symptomatic central nervous system (CNS) metastasis or carcinomatous meningitis;
7. The subjects with pyloric obstruction;
8. The subjects with active or poorly controlled serious infections