 Maintenance therapy: Beginning within 4-7 weeks after completion of chemoradiotherapy and bevacizumab, patients receive gemcitabine IV over 30 minutes on days 1, 8, and 15 and bevacizumab IV over 30 minutes on days 1 and 15 provided that blood counts have returned to normal. Courses repeat every 28 days in the absence of disease progression or unacceptable toxicity. 