Multiple Donor Treg DLI for Severe Refractory Chronic GVHD

"Purified Treg cells will be obtained from the original HSC donor (T reg DLI).~Tregs preparation will start with unstimulated donor leukapheresis from the original stem cell donor.~The apheresis product will be provided to the Cell Factory Calori,Milano, where T reg purification will take place.~T reg cells will be PURIFIED utilizing the CliniMACS Plus Systems for depletion of CD8 and CD19 positive cells and enrichment for CD25high cells.~Release Criteria of Treg cell preparation will be defined.~The product will be infused into the recipient through a venous catheter."