Zevalin and Velcade in Relapsed/Refractory Mantle Cell Lymphoma

Rituximab 250mg/m2 will be given on day 1 and on day 8. Bortezomib 1.5mg/m2 will be given on Days 1, 4, 8, and 11. Y90 ibritumomab tiuxetan will be given on Day 8. Dosage will be based on the platelet count obtained at the time of study enrollment. The dose will be 0.4mCi/kg unless the enrollee's platelets are between 100,000 and 150,000 in which case a dose of 0.3mCi/Kg will be used. Patients who weigh over 80 Kg will receive a maximum dose of 32mCi.