Phase 1b/2a Trial of Allogeneic HSCT From an HLA-partially Matched Related or Unrelated Donor After TCRab+ T-cell/CD19+ B-cell Depletion for Patients With Monogenic and/or Early-onset Medically Refractory Crohn Disease

CliniMACS® TCRαβ-Biotin and CD19 Systems will be used to create the mobilized peripheral blood stem cells (PBSC) from allogeneic donors depleted of TCRαβ+ T cells and CD19+ B cells to be infused into the patient for the HSCT. The target dose for the number of CD34+ HSC infused is \> 10 x 10\^6 cells/Kg recipient weight. The minimum dose is 2 x 10\^6 cells/Kg. There is no upper limit to the dose of CD34+ HSC infused as long as no more than 1 x 10\^5 TCRαβ+ T-cells/Kg are infused. The target dose of TCRαβ+ T cells/Kg is \< 0.50 x 10\^5.

Administered as part of the HSCT conditioning regimen

Administered as part of the HSCT conditioning regimen

Administered as part of the HSCT conditioning regimen

Administered as part of the HSCT conditioning regimen

Administered as part of the HSCT conditioning regimen

200 cGy, administered as part of the HSCT conditioning regimen

Administered as part of the HSCT conditioning regimen