The treatment of sunitinib is the standard dosage and schedule. Sunitinib is given orally at the dose of 50 mg daily for 28 days followed by 2 weeks of rest. Forthcoming cycles remain identical. Modification of the dose may use a lower dose at 37.5 mg or 25 mg given daily on the same schedule. All patients will receive repeated cycles of treatment until disease progression, occurrence of unacceptable toxicity, withdrawal of patient consent, or other withdrawal criteria are met. After discontinuation of treatment and the mandated 28-day follow up, patients will be followed only in order to collect information on further antineoplastic therapy and survival. In patients discontinuing treatment for reasons other than disease progression, tumor assessment will continue until disease progression, or initiation of other antineoplastic therapies.