This is an open label, multi-center study to evaluate the safety and Efficacy of ET-01 Transplantation in subjects with Transfusion Dependent β-Thalassaemia.

After the proper subject is recruited, subject will go through steps generally as stem cell mobilization, apheresis, conditioning and ET-01 infusion to complete therapy. Two years follow-up will be carried out post-transplantation and related data will be collected. Subjects who have been treated by ET-01 will be asked to participate in a long-term follow up study. Monitoring the long-term efficacy and safety up to 15 years after ET-01 transplant.

Inclusion Criteria:

• Subject and/or subject's legal personal representative fully understand and voluntarily sign informed consent forms;
• 6~35 years old, all gender;
• Diagnosis of transfusion dependent β-thalassemia (β-TDT) as defined by protocol;
• Eligible for autologous stem cell transplant;
• Eligible for autologous stem cell transplant;
• Organs in good function.
• Other protocol defined inclusion criteria may apply.

Exclusion Criteria:

• Subjects with associated α-thalassemia;
• Active bacterial, virus, fungal or parasitic infection, including HIV infection, HbsAg and HBV DNA positive, HCV DNA positive, or Treponema Pallidum infection;
• HLA identical sibling or unrelated donors are available;
• Prior allo-HSCT or gene therapy.
• Other protocol defined exclusion criteria may apply.