- Documented engraftment with sustained neutrophil counts of at least 1000/mcl and untransfused platelet counts > 20 000/mcl for 3 consecutive lab values (the last one tested <10 days before initiation of treatment) on 3 different days prior to treatment. Patients who have engrafted but require G-CSF for myelosuppressive antibiotics or antiviral medications are eligible if they require G-CSF no more than twice weekly and their ANC remains >1000/mcl.