A Phase 2 Safety and Efficacy Study Evaluating CS-101 in Participants With β-Thalassemia Major

Inclusion Criteria: * Voluntarily signed informed consent. Male or female participants aged 12 to 35 years (inclusive). The participant or their legally authorized representative must sign the informed consent. If the participant is under 18 years of age, their legally authorized representative must also sign the informed consent. * Diagnosed with β-thalassemia major (transfusion-dependent). Received at least 8 units of red blood cell transfusions within 12 months prior to screening, and documented hemoglobin level ≤ 70 g/L pre-transfusion. * Good general condition: Karnofsky score (≥16 years of age) ≥ 60, or Lansky Play-Performance score (\<16 years of age) ≥ 60. * For females of childbearing potential: From the start of the screening, highly effective contraception or complete abstinence (if this is their usual lifestyle), and agree to maintain such contraception throughout the study. * For males of childbearing potential: Use condoms or other methods to ensure effective contraception for sexual partners continuously from mobilization through the study period. Exclusion Criteria: * Received other investigational products or other experimental interventions within 30 days prior to signing informed consent or within 6 elimination half-lives of the drug (whichever is longer). * Received or is receiving thalidomide, hydroxyurea, and/or luspatercept within 3 months prior to screening. * Previous received allogeneic hematopoietic stem cell transplantation, gene therapy, or gen…