To Compare the Efficacy of the Addition of Methotrexate (MTX) to Current Standard Acute Graft-versus-host Disease (GVHD) First-line Treatment With Corticosteroids

"Methotrexate 5 mg/m2 will be given once week for 4 weeks, then 3 mg/m2 every two weeks for 12 weeks. Body surface area will be capped at 2 m2.~Methotrexate will be given as an IV infusion over 15 minutes. All patients will received prednisone 2 mg/kg.day PO (or methylprednisolone 1.6 mg/Kg/day) for 3 days.~For responding patients between day 4 and 28, the dose of prednisone must be at least 0.25 mg/kg/day prednisone (or 0.2 mg/kg/day methylprednisolone).~All patients should receive a folinic acid supplementation 24 hours after each MTX/placebo administration.~Lederfoldin 10 mg po or iv will be administered on days 2, 9, 16 and 23. Lederfoldin 10 mg po or iv will be administered on days 37, 51, 65, 79, 93 and 103."

"Placebo 5 mg/m2 will be given once week for 4 weeks, then 3 mg/m2 every two weeks for 12 weeks. Body surface area will be capped at 2 m2.~Placebo will be given as an IV infusion over 15 minutes. All patients will received prednisone 2 mg/kg.day PO (or methylprednisolone 1.6 mg/Kg/day) for 3 days.~For responding patients between day 4 and 28, the dose of prednisone must be at least 0.25 mg/kg/day prednisone (or 0.2 mg/kg/day methylprednisolone).~All patients should receive a folinic acid supplementation 24 hours after each MTX/placebo administration.~Lederfoldin 10 mg po or iv will be administered on days 2, 9, 16 and 23. Lederfoldin 10 mg po or iv will be administered on days 37, 51, 65, 79, 93 and 103."