ARM II: Patients receive gemcitabine hydrochloride IV over 30 minutes on days 1 and 8 and placebo PO on days 1-21. Courses repeat every 21 days in the absence of disease progression or unacceptable toxicity. Patients who experience disease progression may receive single-agent pazopanib hydrochloride PO daily. Courses repeat every 21 days in the absence of disease progression or unacceptable toxicity.