Inclusion Criteria:

          1. Histologically confirmed diagnosis of metastatic or advanced unresectable tumors that
             progressed on standard therapy

          2. Agreement to provide mandatory archival tissue or fresh biopsy.

          3. At least 18 years of age.

        Exclusion Criteria:

          1. Prior therapy with a chimeric antigen receptor (CAR) T-cell containing regimen.

          2. History of severe allergic or anaphylactic reactions to human monoclonal antibody
             therapy or known hypersensitivity to any Probody therapeutic.

          3. Active or history of uveal, mucosal, or ocular melanoma. Human immunodeficiency virus
             (HIV) or acquired immune deficiency syndrome (AIDS)-related illness, chronic hepatitis
             B or C.

          4. History of or current active autoimmune diseases, including but not limited to
             inflammatory bowel diseases, rheumatoid arthritis, autoimmune thyroiditis, autoimmune
             hepatitis, systemic sclerosis, systemic lupus erythematosus, autoimmune vasculitis,
             autoimmune neuropathies, or type 1 insulin dependent diabetes mellitus.

          5. History of syndrome or medical condition(s) that requires systemic steroids (> 10 mg
             daily prednisone equivalents) or immunosuppressive medications.

          6. History of allogeneic tissue/solid organ transplant, prior stem cell or bone marrow
             transplant.

          7. Chemotherapy, biochemotherapy, radiation or immunotherapy or any investigational
             treatment within 30 days prior to receiving any study drug.

          8. Major surgery (requiring general anesthesia) within 3 months or minor surgery
             (excluding biopsies conducted with local/topical anesthesia) or gamma knife treatment
             within 14 days (with adequate healing) of administration of any study drug.