Clinical Trial of YH32367 in Patients With HER2 Positive Locally Advanced or Metastatic Solid Tumor

This first-in-human study will be counducted to evaluate the safety, tolerability, pharmacokinetics (PK) and anti-tumor activity of YH32367 in Patients with HER2-Positive Locally Advanced or Metastatic Solid Tumors.

Inclusion Criteria: \[Dose Escalation Part\] * Pathologically confirmed HER2-positive * Mandatory provision of tumor tissue sample \[Dose Expansion Part\] * Patients who have at least one measurable lesion * Mandatory provision of tumor tissue sample 1. Cohort 1: Pathologically confirmed HER2-positive biliary tract cancer 2. Cohort 2: Pathologically confirmed HER2-positive metastatic solid tumor malignancy other than breast and gastric or gastroesophageal junction adenocarcinoma and biliary tract cancer Exclusion Criteria: * Uncontrolled central nervous system (CNS) metastases * Spinal cord compression * Carcinomatous meningitis * Acute coronary syndromes * Heart failure * Interstitial lung disease (ILD) * Pneumonitis * History of a second primary cancer * Human immunodeficiency virus (HIV) * Active chronic hepatitis B * Hepatitis C * Systemic steroid therapy * Autoimmune disease