Bortezomib for the Treatment of Refractory Chronic Graft-vs-Host Disease(cGVHD)

1.6 mg/m2 IV infusion on days 1, 8, 15, 22 of each 35 day cycle, for up to 6 cycles.Patients who continue to respond during the initial treatment phase with no ongoing significant adverse events will be eligible to receive up to 6 additional cycles.This maintenance dose will be administered on days 1 and 15.