Bortezomib to Treat Significant Complication of HSCT

Inclusion Criteria: * All patients, having undergone allogeneic stem cell transplantation at our center. * Should have failed at least 2 standard treatments for autoimmune cytopenias. Standard treatments include corticosteroids, rituximab, IVIG, plasmapheresis, withdrawal of cyclosporine, cyclophosphamide and MMF. Definition of "failed" treatment will be no response of cytopenia after 2 weeks of continued treatment OR requirement of daily GCSF at 10 mcgs/kg/day for autoimmune neutropenia despite 2 weeks of treatment, transfusions of packed red blood cells or platelets 3 times weekly for 2weeks despite continued treatment OR 5days/week plasmapheresis for 2 weeks and inability to wean the duration. * Definition of autoimmune hemolytic anemia- development of anemia, where there is a hemoglobin drop of \>2 g/dL/48 hours or an absolute value of hemoglobin \< 8 g/dL, and evidence of hemolysis by positive direct Coombs test with compatible peripheral blood cell morphology, reticulocyte count and bilirubin level. * Definition of autoimmune neutropenia - absolute neutrophil counts \< 500 for 2 weeks and presence of anti-neutrophil antibodies. * Definition of autoimmune thrombocytopenia- Platelet counts \< 20,000 cells/uL for 2 weeks and presence of anti-platelet antibodies. Exclusion Criteria: * Ongoing life threatening infections * Documented anaphylaxis to bortezomib * Failed engraftment * Relapse of primary malignancy * ≥6/8 matched or haploidentical transplants