Incidence of Pulmonary Toxicity Measured by Respiratory Failure

Group A (Tacrolimus, Methotrexate)

Participants receive tacrolimus IV over 24 hours beginning on day -1 (or tacrolimus orally beginning on day -3) and then PO BID after engraftment with a taper from day 100 to day 180 (in the absence of GVHD). Patients also receive methotrexate IV on days 1, 3, 6, and 11. tacrolimus: Tacrolimus 0.03 mg/kg/day beginning day -1 or tacrolimus 0.03mg/kg/dose BID orally beginning on day -3. If Tac is administered intravenously, it will be given over 24 hours and will be converted to oral administration 2 times a day when the patient has engrafted and/or can tolerate oral medication. Levels of Tac will be obtained to maintain a recommended target serum level of 5-12 ng/mL methotrexate: MTX 15mg/m2 IV on day +1, followed by 10mg/m2 on day +3, +6, +11. If patient \< 10 kg then MTX will be given at 0.5 mg/kg IV on day +1. Then MTX will be given at 0.33 mg/kg on days +3, +6 and +11.

Group B (Tacrolimus, Methotrexate, Mycophenolate Mofetil)

Patients receive tacrolimus as in group A and methotrexate (low dose) IV on days 1, 3, and 6. Patients also receive oral mycophenolate mofetil BID beginning on day 1, with a taper from day 45 to day 100 (in the absence of GVHD). tacrolimus: Tacrolimus 0.03 mg/kg/day beginning day -1 or tacrolimus 0.03mg/kg/dose BID orally beginning on day -3. If Tac is administered intravenously, it will be given over 24 hours and will be converted to oral administration 2 times a day when the patient has engrafted and/or can tolerate oral medication. Levels of Tac will be obtained to maintain a recommended target serum level of 5-12 ng/mL Mycophenolate mofetil: Patients will receive Mycophenolate beginning on day +1. Patients \>40 kg will receive Mycophenolate 1000 mg twice a day. Mycophenolate should be given orally twice a day. IV formulation may be used if the patient cannot tolerate oral route. Patients \< 40 kg will receive MMF 45 mg/kg/day (15 mg/kg three times a day). MMF may be given orally or intravenously as per institutional protocol Methotrexate (low dose): MTX 5mg/m2 IV on day +1, +3, +6. If patient\<10 kg MTX will be given at 0.17 mg/kg on day +1, +3, and +6.

Analysis denominator · Participants

1. group Ids

   1. OG000
   2. OG001

   non Inferiority Comment

   180-day incidence of complications will be compared using the Gray test.

   non Inferiority Type

   NON_INFERIORITY

   p Value

   <0.05

   statistical Method

   Gray Test