 Patients will be treated with Imatinib Gleevec 400 mg two times a day for eight weeks after which radiologic imaging will be obtained to assess response. Patients who attained a complete response will be treated with four additional weeks of Imatinib. Patients who attain a partial response or stable disease will be treated until a complete response is attained, or until disease progression. All patients with progression of disease will be taken off the study. Patients continuing on the study, will undergo radiologic imaging every eight weeks following their initial response assessment. All patients will be followed until death. 