Outcome of Age-Adapted Approach to HLA-Identical Related Hematopoietic Stem Cell Transplantation in Severe Sickle Cell Disease: Saudi Experience

In this study, we reviewed the outcome of SCD patients who underwent transplant at our institution using standard protocols (NMA regimen in patients ≥14 years and myeloablative regimen in < 14 years) to address whether age remains a risk factor that influences HSCT outcome in SCD.Children (<14 years) with severe SCD received myeloablative conditioning using one of two regimens: first regimen was cyclophosphamide (Cy) 200mg/kg, busulfan (Bu) 16mg/kg, and thymoglobulin (ATG) 10mg/kg and recently we use thiotepa 8mg/kg, Bu 16mg/kg, and fludarabine (Flu) 160mg/m2. Bu pharmacokinetics was performed to target AUC of 900-1350 µmol/L.min. GVHD prophylaxis included cyclosporine and methotrexate 10mg/m2 on day +1, +3, and +6. Bone marrow was the source of stem cells in all pediatric patients. Cyclosporine was continued during the first-year post HSCT and tapered slowly afterward based on donor chimerism. Adult patients (≥14 years) received hydroxyurea at maximum tolerated dose and hypertransfusion for 2-3 months with iron chelation if indicated prior to HSCT followed by NMA conditioning consisting of alemtuzumab (1mg/kg divided over 5 days on day -7 to -3) and TBI 300 cGy with testicular shielding in males on day -1. Sirolimus was used as GVHD prophylaxis starting day -2 and continued for at least one-year post HSCT with subsequent taper based on donor chimerism. Stem cells source was GCSF mobilized peripheral blood stem cells in all adult patients targeting cell dose...
Source: Blood - Category: Hematology Authors: Tags: 732. Clinical Allogeneic Transplantation: Results: Poster II Source Type: research