CD34 and X-linked adrenoleukodystrophy: The prognosis is poor for advanced stage cerebral X-ALD [10, 11] and alternatively to allogeneic stem cell transplants, therapy involving infusion of autologous CD34?+?cells transduced with the elivaldogene tavalentivec (Lenti-D) lentiviral vector [12?14] have been performed on X-ALD patients with effective outcome.