- Steroids: Patients who require or are likely to require corticosteroid or other immunosuppressive drugs for intercurrent disease (any other significant medical problem related to or independent from the neuroblastoma or its treatment) while tentatively scheduled to be receiving treatment on this study are ineligible; the only exception is for patients known to require 2 mg/kg or less of hydrocortisone (or an equivalent dose of an alternative corticosteroid) as premedication for blood product transfusion in order to avoid allergic transfusion reactions