- Stem cell mobilization and collection: Beginning 5-7 days, but no more than 3 weeks, after completion of induction chemotherapy, patients receive cyclophosphamide IV over 45-60 minutes on day 0, filgrastim (G-CSF) subcutaneously (SC) on days 1-10, and sargramostim (GM-CSF) SC beginning on day 1 and continuing until completion of peripheral blood stem cell (PBSC) collection. Patients begin PBSC collection on day 11 or as soon as blood counts recover.