Patients receive oral beta-glucan once daily on days -4 to 12 and monoclonal antibody 3F8 IV over 30-90 minutes on days 1-5 and 8-12. Treatment repeats every 4 weeks for up to 4 courses in the absence of disease progression or unacceptable toxicity and with a human antimouse antibody (HAMA) titer < 1,000 U/mL.