A Phase 1 Study of BGB-B2033, Alone or in Combination With Tislelizumab With or Without Bevacizumab, in Participants With Advanced or Metastatic Solid Tumors

Inclusion Criteria

• Participants must have one of the following unresectable, locally advanced, or metastatic tumor types:
• Hepatocellular carcinoma (HCC): Histologically or cytologically confirmed HCC that is either Barcelona Clinic Liver Cancer (BCLC) Stage C, or BCLC Stage B that is not amenable to, or has progressed after, loco-regional therapy and is not eligible for a curative treatment approach.
• Alpha-fetoprotein (AFP)-producing gastric cancer (GC): Histologically confirmed GC with AFP > 20 ng/mL in blood or tumor tissue positive for AFP by a validated immunohistochemistry (IHC) assay based on local or central testing.
• Germ cell tumors: Histologically confirmed germ cell tumors including extragonadal yolk sac tumors (e.g., located in the mediastinum, vagina, brain, retroperitoneum), and non-dysgerminomas for which no further curative systemic treatment options exist.
• Glypican-3 (GPC3)-positive squamous non-small cell lung cancer (NSCLC): Histologically confirmed GPC3-positive squamous NSCLC with prior exposure to a checkpoint inhibitor (CPI).
• At least one evaluable lesion for dose escalation, and
• At least one measurable lesion for safety expansion, as defined by Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1.
• Eastern Cooperative Oncology Group (ECOG) Performance Status ≤ 1.
• Adequate organ function as defined in the protocol.
• Provision of tumor tissue samples is required for specified parts of the study. Key

Exclusion Criteria

• Prior therapy directed against glypican-3 (GPC3) or the T-cell costimulatory receptor 4-1BB (CD137).
• Active leptomeningeal disease or uncontrolled/untreated brain metastases.
• Active autoimmune disease or a history of autoimmune disease with potential for relapse.
• Any malignancy diagnosed ≤ 2 years before the first dose of study drug(s), except: The cancer type under investigation in this study, or Locally recurring malignancies previously treated with curative intent.
• Requirement for systemic corticosteroids (> 10 mg/day prednisone or equivalent) or other immunosuppressive therapy within 14 days prior to the first dose of study drug(s).
• Certain comorbidities involving the lungs, heart, bleeding conditions, or active infections, as defined in the protocol. Note: Additional protocol-defined inclusion and exclusion criteria may apply.