A First-in-Human Study of HH160 in Participants With Advanced or Metastatic Solid Tumors

Key Inclusion Criteria 1. Adults aged 18 to 75 years with signed informed consent. 2. Histologically or cytologically confirmed advanced solid tumors meeting phase-specific disease requirements. 3. At least 1 measurable lesion per RECIST v1.1. 4. Eastern Cooperative Oncology Group Performance Status (ECOG) Performance Status of 0 or 1 with life expectancy ≥ 12 weeks. 5. Adequate organ function based on protocol-specified laboratory criteria. Key Exclusion Criteria 1. Active leptomeningeal disease or uncontrolled/untreated brain metastases. 2. History of severe hypersensitivity reactions to monoclonal antibodies, bispecific antibodies, trispecific antibodies, or study drug components. 3. Other malignancy within 3 years prior to first dose, except specified curatively treated cancers. 4. Uncontrolled pleural effusion, pericardial effusion, or ascites requiring frequent drainage. 5. Significant bleeding risk, severe coagulopathy, gastrointestinal hemorrhage, or recent pulmonary hemorrhage/hemoptysis. NOTE: Other eligibility criteria may apply.