You will return for follow-up tests for 4 years. Blood (about 2 tablespoons) will be drawn weekly for the first 3 months. Blood (about 2 tablespoons each time) will also be drawn at month 6 and 9 of the first year, and every 6 months in the second, third, and fourth years. You may also have CT scans, PET scans (which are recommended), x-rays, and bone marrow biopsies and aspirates performed, if your doctor thinks they are necessary.