The European Medicines Agency has paused the renewal procedure for the EU conditional marketing authorization (CMA) for Zynteglo (betibeglogene autotemcel) while it continues to look into concerns over the safety of the lentiviral vector used to manufacture the beta thalassaemia gene therapy from bluebird bio.
The EMA said on 12 March that it had started reviewing Zynteglo’s safety due to concerns over a case of acute myeloid leukaemia (AML) that was diagnosed in a patient who was taking part in a Phase I/II study of bluebird's investigational drug for sickle cell disorder, LentiGlobin (bb1111). LentiGlobin and Zynteglo use the same lentiviral vector