Long-term Follow-up of Participants With Cerebral Adrenoleukodystrophy Who Were Treated With Lenti-D Drug Product

This is a multi-center, long-term safety and efficacy follow-up study for participants with cerebral adrenoleukodystrophy (CALD) who have received Lenti-D Drug Product (eli-cel) in a parent clinical study (Study ALD-102 or Study ALD-104). After completing a parent clinical study (approximately 2 years), eligible participants will be followed for an additional 13 years for a total of 15 years post-drug product infusion. No investigational drug product will be administered in this study.

Inclusion Criteria:

* Provision of written informed consent for this study by the participant or participant's parent(s)/ legal guardian(s) and written informed assent by participant, if applicable
* Have received eli-cel in a parent clinical study

Exclusion Criteria:

* There are no exclusion criteria for this study