Once you are completely off this study for any reason, you will have an end-of-study visit. During this visit, you will have a complete physical exam, including measurement of your height and weight. You will be asked how well you are able to perform the normal activities of daily living (performance status evaluation). You will have a brain and spinal exam. You will have blood drawn (about 5 teaspoons) for routine tests. This routine blood draw will include a pregnancy test for women who are able to have children. About 1 teaspoon of blood will be drawn to test for the ability of your blood to clot normally.