 Patients must stay in the hospital for the high-dose drug treatment. The length of stay will be about 3 weeks. Blood tests will be done daily while in hospital, then once a week for the first month. A bone marrow sample will be taken on Day 30. Blood samples will be taken 4 times in the first year and once a year after that. Thyroid gland tests and a bone marrow test will be done once a year. 