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The researchers are doing this study to find out whether emapalumab or a combination of fludarabine and dexamethasone are effective in preparing people with a primary immune regulatory disorder (PIRD) and/or an autoinflammatory condition to receive a stem cell transplant. The researchers will look at how well the study treatments reduce inflammation and aid in the engraftment process (the process of donated stem cells traveling to the bone marrow, where they begin to make new immune cells. "Funding Source - FDA OOPD"
The major morbidities of allogeneic hematopoietic stem cell transplant (HSCT) using donors that are not human leukocyte antigen (HLA) matched siblings are graft vs host disease (GVHD) and life- threatening infections. T cell receptor alpha beta (TCRαβ) T lymphocyte depletion and CD19+ B lymphocyte depletion of alternative donor hematopoietic stem cell (HSC) grafts is effective in preventing GVHD, but immune reconstitution may be delayed, increasing the risk of infections. The central hypothesis of this study is that an addback of CD45RO memory T lymphocytes, derived from a fraction of the original donor peripheral stem cell product depleted of CD45RA naïve T lymphocytes, will accelerate immune reconstitution and help decrease the risk of infections in TCRab/CD19 depleted PSCT.