A Phase 1 Dose Escalation Study of MGA271 in Refractory Cancer

Inclusion Criteria:

- Histologically or cytologically confirmed carcinoma, melanoma, or glioblastoma that
overexpresses B7-H3.

- Progressive disease during or after last treatment regimen.

- Appropriate treatment history for histological entity.

- ECOG Performance Status <= 1.

- Life expectancy >= 3 months.

- Measurable disease or evaluable disease with relevant tumor marker elevation.

- Acceptable laboratory parameters and adequate organ reserve.

Exclusion Criteria:

- Evidence of adrenal insufficiency by rapid Cosyntropin stimulation test (patients
with glioblastoma who have or are receiving steroids in past 4 months will be
exempted from this exclusion).

- Major surgery or trauma within four weeks before enrollment.

- Known hypersensitivity to murine or recombinant proteins, polysorbate 80, or any
excipient contained in the drug formulation.

- History of autoimmune disease associated with ipilimumab therapy.

- Second primary malignancy that has not been in remission for greater than 3 years.
Treated non-melanoma skin cancer, cervical carcinoma in situ on biopsy, or squamous
intraepithelial lesion on PAP smear, localized prostate cancer (Gleason score < 6),
or resected melanoma in situ are exceptions and do not require a 3 year remission.

- Active viral, bacterial, or systemic fungal infection requiring parenteral treatment
within four weeks of enrollment. Patients requiring any oral antiviral, fungal, or
bacterial therapy must have completed treatment within one week of enrollment.

- Vaccination within 2 weeks of enrollment (except for annual flu vaccine).

- History of chronic or recurrent infections that require continual use of antiviral,
antifungal, or antibacterial agents.