Phase II Study of Fractionated 90Y Ibritumomab Tiuxetan (Zevalin) Radioimmunotherapy as an Initial Therapy of Follicular Lymphoma

2 x iv infusions of 11.1 MBq/kg. 1st infusion at week 1, 2nd during weeks 9-13. 2nd infusion may be reduced to 7.4MBq/kg in the case of grade 3 haematological toxicity following the 1st infusion.

"All patients receive 2 x iv infusions of 250 mg/m2 Rituximab given 7-8 days apart prior to each zevalin infusion. The 2nd rituximab infusion is given immediately prior to Zevalin.~In addition patients with greater than 20% bone marrow involvement at screening receive rituximab pretreatment prior to entering the main treatment phase of the trial, consisting of 4 x weekly iv doses of rituximab(375 mg/m2). This is followed by a repeat bone marrow biopsy, bone marrow involvement must have fallen to \<= 20% to enter the main treatment phase of the trial."