JSP191 Antibody Targeting Conditioning in SCID Patients

Inclusion Criteria

• Typical SCID as defined by Primary Immune Deficiency Treatment Consortia including but not limited to the following subtypes:
• T-, B+, NK-: IL-2Rcγ deficient, JAK3-deficient (no longer enrolling)
• T-, B-, NK+: RAG1/2 deficient, Artemis-deficient
• T-, B+, NK+: IL7Rα deficient, CD3 subunit deficient, CD45 deficient (no longer enrolling) OR Variant SCID with absent or low T cell function, Omenn syndrome, Leaky SCID, Reticular dysgenesis, Adenosine deaminase deficiency, and Purine nucleoside phosphorylase deficiency may be included after consultation with the medical monitor.
• Patients with human leukocyte antigen (HLA) matched related or unrelated donors
• Adequate end organ function as defined in study protocol
• Age ≤ 12 years
• Prior donor of appropriate age (≥ 5 years old) available for re-collection of stem cells
• Previous allogeneic Hematopoietic Cell Transplantation HCT (≥ 6 months post initial transplant) with poor graft function Key

Exclusion Criteria

• Patients with any acute or uncontrolled infections
• Patients receiving any other investigational agents, or concurrent biological, chemotherapy, or radiation therapy
• Patients with active malignancies
• Active GVHD within 6 months prior to enrollment, or on immunosuppressive therapy for GVHD