Before you can start treatment on this study, you will have "screening tests." These tests will help the doctor decide if you are eligible to take part in this study. Your complete medical history will be recorded and there will be a review of all medicines you may be currently taking. You will have a physical exam, including measurement of your vital signs (blood pressure, heart rate, temperature, and breathing rate). You will have blood drawn (about 4 teaspoons) and urine collected for routine tests. You will have a chest x-ray, an electrocardiogram (ECG--a test to measure the electrical activity of the heart), a bone scan, and a computed tomography (CT) scan of your abdomen and pelvis. If the study doctor thinks it is necessary, you may have an assessment of your mental status. For this assessment, you will be asked questions about your attention span, memory, and mood disturbances. It will take about 25 minutes to complete.