A Study of SGN-BB228 in Advanced Melanoma and Other Solid Tumors

Inclusion Criteria:

All Parts: Participants must have disease that is relapsed, refractory, or intolerant to standard of care. Participants must have histologically or cytologically confirmed metastatic malignancy.

Participants must have one of the following tumor types:

Parts A and B: Participants must have unresectable cutaneous melanoma.

Part C: Participants must have one of the following tumor types:

Cutaneous Melanoma
Non-small Cell Lung Cancer (NSCLC)
Colorectal Cancer (CRC)
Pancreatic Cancer
Mesothelioma

For participants with cutaneous melanoma

Must have been previously treated with an anti-programmed death-1 (anti-PD-1) or anti-programmed death ligand-1 (anti-PD-L1) agent given alone or with other therapies.
Participants with a targetable BRAF mutation must have been treated with, been intolerant of, or declined treatment with BRAF/MEK targeted therapy prior to study entry.
Eastern Cooperative Oncology Group (ECOG) Performance Status score of 0 or 1
Measurable disease per RECIST v1.1 at baseline

Exclusion Criteria:

History of another malignancy within 3 years before the first dose of study drug, or any evidence of residual disease from a previously diagnosed malignancy.

Active central nervous system metastases or leptomeningeal disease. Participants with previously treated brain metastases may participate provided they are:

clinically stable for at least 4 weeks prior to study entry after brain metastasis treatment,
they have no new or enlarging brain metastases,
and are off of corticosteroids prescribed for symptoms associated with brain metastases for at least 7 days prior to the first dose of study drug.
Prior therapies cannot include any drugs targeting CD228 or 4-1BB
Immunotherapy, biologics, and/or other approved or investigational antitumor treatment that is not completed 4 weeks prior to first dose of study drug, or within 2 weeks prior to the first dose of study drug if the underlying disease has progressed on treatment