- Posttransplantation therapy: Beginning 33 days after BMT/PBSCT, patients receive sargramostim (GM-CSF) subcutaneously on days 1-15 and MOAB 3F8 IV within 90 minutes (beginning approximately 1 hour after initiation of GM-CSF infusion) on days 6-15. Treatment repeats every 28 days for 2 courses.