Study of Itacitinib in Combination With Corticosteroids for the Treatment of Acute GVHD

All subjects will receive prednisone 2.5 mg/kg per day PO (or methylprednisolone 2 mg/kg IV daily) on Days 1 through 5. Subjects will be tapered as tolerated beginning on Day 6 to no less than 0.25 mg/kg per day PO (or methylprednisolone 0.2 mg/kg per day) by Day 28. After Day 28, corticosteroids should be tapered according to institutional guidelines to attain ≤ prednisone 0.2 mg/kg per day (or ≤ methylprednisolone 0.16 mg/kg per day) by Day 56.