RecruitingClinical trialA Study of Participants with Β-Thalassemia Treated with Betibeglogene AutotemcelThe main aim of this study is to collect real-world longitudinal data on participants with β-thalassemia treated with betibeglogene autotemcel (beti-cel) in the post marketing setting. To assess the long-term safety, including the risk of newly diagnosed malignancies, after treatment with beti-cel and evaluate the long-term effectiveness of treatment with beti-cel.