Kaplan-Meier estimate of survival for cerebral X-linked adrenoleukodystrophy following hematopoietic cell transplantation by number of neurologic deficits and MRI severity score before transplantation. Solid line indicates patients with 0 to 1 neurologic deficits and MRI severity score less than 9 (n = 25). Dashed line indicates patients with 2 or more neurologic deficits or MRI severity score 9 or greater (n = 37). Ticks on probability lines indicate dates of censoring at last follow-up.