An open label multi-site phase II clinical trial of sunitinib malate given orally once daily on days 1-28 of each 42-day cycle. Sunitinib malate will be dispensed as capsules at the beginning of each treatment cycle. The dose may be escalated at the investigator's discretion. Treatment will be continued until there is either disease progression or cumulative or acute toxicity which in the opinion of the treating physician compromises the ability of the patient to receive treatment or patient desire to stop treatment.