EDIT-301 for Autologous Hematopoietic Stem Cell Transplant (HSCT) in Participants With Transfusion-Dependent Beta Thalassemia (TDT)

Participation Requirements

• Sex:

  ALL

• Eligible Ages:

  18 to 35

Participation Criteria

Key Inclusion Criteria:

Diagnosis of Transfusion Dependent B-Thalassemia as defined by:

* Documented homozygous β-thalassemia or compound heterozygous β-thalassemia including β-thalassemia/hemoglobin E (HbE) based on historical data in medical records, and
* History of at least 100 mL/kg/year or 10 U/year of packed red blood cell (RBC) transfusions in the 2 years prior to signing informed consent
* Clinically stable and eligible to undergo autologous HSCT
* Karnofsky Performance Status ≥ 70

Key Exclusion Criteria:

* Available 10/10 human leukocyte antigen (HLA)-matched related donor
* Prior HSCT or contraindications to autologous HSCT
* Participants with associated a history of α-thalassemia and \> 1 alpha chain deletion, or alpha multiplications as documented in medical records
* Participants with a history of other inherited hemoglobinopathy or thalassemic mutation (Hb S, C, D or other) as documented in medical records
* Prior receipt of gene therapy
* Inadequate bone marrow function, as defined by white blood cell count of \< 3 x 10\^9/L or a platelet count \< 100 x 10\^9/L (without hypersplenism), per investigator judgement
* Inadequate organ function
* Advanced liver disease
* Any prior or current malignancy, or immunodeficiency disorder,
* Immediate family member with a known or suspected Familial Cancer Syndrome
* Clinically significant and active bacterial, viral, fungal, or parasitic infection