Study of Untreated or Transformed Follicular Non-Hodgkin's Lymphoma With Fission-Derived Iodine I 131 Tositumomab

This is a multi-center study in which 12 patients with previously untreated or relapsed follicular or transformed follicular non-Hodgkin's lymphoma will receive a dosimetric dose of fission-derived Iodine I 131 Tositumomab followed by a therapeutic dose of tellurium-derived Iodine I 131 Tositumomab. Blood Pharmacokinetics, total body clearance, tumor and organ dosimetry, and biodistribution will be assessed following administration of the dosimetric dose.