Sirolimus, Tacrolimus and Short Course Methotrexate for Prevention of Acute GVHD in Recipients of Mismatched Unrelated Donor Allogeneic Stem Cell Transplantation

Tacrolimus will be administered at a dose of .02mg/kg/d IVCI beginning day -3 until able to take oral medicines reliably. Blood levels will be maintained at 5-10 ng/ml. The oral dose will be 4 times the IV dose. Tacrolimus will be converted to oral dosing prior to hospital discharge. Tacrolimus will be continued until 4 months post transplant (day +120) unless toxicity, refractory GVHD or the development of disease recurrence mandate discontinuation of the drug.

Sirolimus will be administered as a 12 mg oral loading dose on day -3 followed by 4mg daily. Sirolimus levels will be obtained on day +0 and then at least twice weekly to maintain a trough serum level of 3-12 ng/ml. Sirolimus will be continued until 5 months post transplant (day +150) unless toxicity, refractory GVHD or the development of disease recurrence mandate discontinuation of the drug.

Methotrexate, dose #1 will be administered on day +1 post transplantation, as an IV bolus, provided at least 24 hours have elapsed following infusion of donor stem cells at a dose of 10mg/m2. Dose #2 of Methotrexate will be administered 48 hours later, as IV bolus on day +3 at a dose of 5mg/m2.