Study: NCT00795132

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Anti-Thymocyte Globulin
Description: Thymoglobulin will be administered at a dose of 2.5 mg/kg recipient body weight intravenously on each of 4 successive mornings (Days -4, -3,-2,-1) for patients receiving unrelated grafts and at a dose of 2.5mg/kg as a single dose on d-1 for patients receiving related marrow grafts. ATG is infused over a minimum of 4 hours, but is generally better tolerated over 6-8 hours. Suggested premedications are acetaminophen (10 mg/kg/dose), diphenhydramine (1 mg/kg/dose), and methylprednisolone. The methylprednisolone should be given at a dose of~1mg/kg 30 minutes prior to the ATG, with another 1mg /kg four hours into the infusion (total 2mg/kg/d). Patients are observed continuously for possible allergic reactions throughout the infusion.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Anti-Thymocyte Globulin
Description: Thymoglobulin will be administered at a dose of 2.5 mg/kg recipient body weight intravenously on each of 4 successive mornings (Days -4, -3,-2,-1) for patients receiving unrelated grafts and at a dose of 2.5mg/kg as a single dose on d-1 for patients receiving related marrow grafts. ATG is infused over a minimum of 4 hours, but is generally better tolerated over 6-8 hours. Suggested premedications are acetaminophen (10 mg/kg/dose), diphenhydramine (1 mg/kg/dose), and methylprednisolone. The methylprednisolone should be given at a dose of~1mg/kg 30 minutes prior to the ATG, with another 1mg /kg four hours into the infusion (total 2mg/kg/d). Patients are observed continuously for possible allergic reactions throughout the infusion.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Fludarabine
Description: Administration and Dosage: Fludarabine will be administered at a dose of 30 mg/m2 in 100 ml of D5W intravenously over one hour on each of six consecutive days -10 through -5 for unrelated grafts or d-7 through d-2 for related grafts. Fludarabine is a fluorinated nucleotide analog of the antiviral agent vidarabine, 9-beta-D-arabinofuranosyladenine. Fludarabine phosphate is rapidly dephosphorylated to 2-fluoro-ara-A and then phosphorylated intracellularly by deoxycytidine kinase to the active triphosphate, 2-fluoro-ara-ATP. The half-life of 2-fluoro-ara-A is approximately 10 hours. The mean total plasma clearance is 8.9 L/hr/m2 and the mean volume of distribution is 98 L/m2. Approximately 23% is excreted unchanged. This metabolite appears to act by inhibiting DNA polymerase alpha, ribonucleotide reductase and DNA primase, thus inhibiting DNA synthesis.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Fludarabine
Description: Administration and Dosage: Fludarabine will be administered at a dose of 30 mg/m2 in 100 ml of D5W intravenously over one hour on each of six consecutive days -10 through -5 for unrelated grafts or d-7 through d-2 for related grafts. Fludarabine is a fluorinated nucleotide analog of the antiviral agent vidarabine, 9-beta-D-arabinofuranosyladenine. Fludarabine phosphate is rapidly dephosphorylated to 2-fluoro-ara-A and then phosphorylated intracellularly by deoxycytidine kinase to the active triphosphate, 2-fluoro-ara-ATP. The half-life of 2-fluoro-ara-A is approximately 10 hours. The mean total plasma clearance is 8.9 L/hr/m2 and the mean volume of distribution is 98 L/m2. Approximately 23% is excreted unchanged. This metabolite appears to act by inhibiting DNA polymerase alpha, ribonucleotide reductase and DNA primase, thus inhibiting DNA synthesis.