Dose Escalation and Expansion Study of BH3120 Alone or With Pembrolizuamb in Advanced or Metastatic Solid Tumors

Key Inclusion Criteria:

* Have a Histologically or cytologically confirmed non-CNS solid tumor that is metastatic or unresectable and for whom there is no available standard therapy.
* PD-L1 positive expression (Tumor Proportion Score ≥1% or Combined Positive Score ≥1).
* Have at least one lesion, not previously irradiated that can be accurately measured per RECIST version 1.1.
* Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
* Age of 18 years or older (or country's legal age of majority if the legal age was \>18 years)
* Adequate Hematologic and liver function.

Key Exclusion Criteria:

* Has received prior therapy with an anti-4-1BB(CD137) agent.
* Known active CNS metastases and/or carcinomatous meningitis.
* Known additional malignancy that is progressing or has required active treatment.
* History of chronic liver disease or evidence of hepatic cirrhosis.
* History of severe toxicities associated with prior immunotherapy, except for adequately controlled endocrine-related adverse events managed with hormone replacement therapy.
* Has ongoing or suspected autoimmune disease.
* Known active and clinically significant bacterial, fungal or viral infection including known human immunodeficiency virus (HIV) or acquired immunodeficiency syndrome (AIDS)-related illness, immunocompromised patients.