Change of Development Plan

This study is a Phase 1b/2 multi-center study to assess the safety, tolerability, pharmacokinetics of CTX-009 (ABL001) in combination with Irinotecan or Paclitaxel in patients with advanced or metastatic solid tumors.

Phase 1b Study:

Indication of phase 1b study is the advanced or metastatic solid tumors (including, but not limited to, colorectal cancer, gastric cancer, and ovarian cancer).

Phase 2 Study:

Indication of phase 2 study is unresectable advanced, metastatic or recurrent biliary tract cancer (BTC) (including intrahepatic cholangiocarcinoma, extrahepatic cholangiocarcinoma, gallbladder cancer, and ampullary carcinoma).

Key Inclusion Criteria:

• P1b only: Patients with histologically or cytologically confirmed metastatic or unresectable advanced solid tumors
• P2 only: Patients with histologically or cytologically confirmed unresectable advanced, metastatic, or recurrent biliary tract cancers (including intrahepatic cholangiocarcinoma, extrahepatic cholangiocarcinoma, gallbladder cancer, ampullary carcinoma)
• P2 only: Patients who have shown disease progress or recurrence of disease after receiving first-line or second-line systemic chemotherapy, including treatment with gemcitabine in combination with a platinum agent
• Patients aged 19 years or older
• At least one lesion measurable defined by response evaluation criteria in solid tumors (RECIST) version 1.1.
• Life expectancy ≥ 12 weeks
• ECOG performance status 0 or 1
• Women of childbearing potential must have a negative pregnancy test outcome
• Patients must provide written informed consent to voluntary participation in this study

Key Exclusion Criteria:

• History of hypersensitivity reactions to any of the components of the investigational product or other drugs of the same class (humanized/human monoclonal antibody) and irinotecan or paclitaxel
• Less than 4 weeks have elapsed since a surgery
• History of cardiac illness: New York Heart Association (NYHA) class ≥ II congestive heart failure (CHF), uncontrolled hypertension, hypertension crisis, pulmonary hypertension, myocardial infarction, uncontrolled arrhythmia, unstable angina
• Persistent, clinically significant NCI-CTCAE v5.0 Grade ≥ 2 toxicities from the previous anticancer therapy
• Severe infections or major and unhealed injury (active ulcer, untreated fracture)
• Symptomatic or uncontrolled central nervous system (CNS) metastasis
• Pregnant or lactating women or patients planning to become pregnant during the study
• Participation in another clinical trial within 30 days prior to initiation of study treatment and received an investigational drug treatment
• Administration of antiplatelets or anticoagulants within 2 weeks prior to screening
• Requiring continuous treatment with systemic NSAIDs or systemic corticosteroids
• HIV or other severe diseases that warrant the exclusion from this study