OUTLINE: This is a multicenter study. Patients receive yttrium Y 90 SMT 487 IV over 10-15 minutes on day 1. Treatment repeats every 6-9 weeks for up to 3 courses in the absence of unacceptable toxicity or disease progression. Quality of life is assessed at baseline and at course 3, week 6. Patients are followed at 6 and 12 months.