A Study of Participants With Cerebral Adrenoleukodystrophy (CALD) Treated With Elivaldogene Autotemcel

Inclusion Criteria: Participants who fulfill the following criteria will be eligible for inclusion in this Registry Study. * Participant must be treated with eli-cel in the post marketing setting at a center in the United States (US) that participates in the Registry Study. * Participant must have provided an informed consent and/or assent to participate in Center for International Blood and Marrow Transplant Research (CIBMTR) registry. * Participant must have provided an informed consent and/or assent to participate in the Registry Study. * Participant must receive follow up care by a US-based physician with the ability to submit REG-502 data. Registry Study Subpopulation inclusion: Twenty-four of the 120 patients in the Registry Study must meet the following inclusion criteria which will be used to create the more advanced early active CALD subpopulation: • Participant must meet the above inclusion criteria and have a Loes score of 4.5 through 9.0 with GdE+ (gadolinium enhancement positivity) from an MRI performed before treatment with eli-cel and with NFS of 0 or 1 at baseline. Exclusion Criteria: There are no exclusion criteria for this Registry Study.