PHASE I: Patients receive bevacizumab IV over 30-90 minutes on days 1 and 15 and humanized monoclonal antibody MEDI-522 IV on days 1, 8, 15, and 22. Courses repeat every 28 days in the absence of disease progression or unacceptable toxicity until the recommended phase II dose (RPTD) of bevacizumab is determined.