Characteristics of Japanese patients with X-linked adrenoleukodystrophy and concerns of their families from the 1st registry system.

Objective: Early diagnosis is critical in achieving the best outcome following hematopoietic stem cell transplantation (HSCT) for X-linked adrenoleukodystrophy (X-ALD). We used a questionnaire to gather detailed clinical information and information regarding the anxieties of patients' families using the registry system for X-ALD.

Methods: We and the patients' families established the registry system for X-ALD in Japan. We created a questionnaire and distributed it to the patients' families.

Results: Questionnaire data from 28 patients were collected. The median age at enrollment was 14.5 years. The most common type of X-ALD was the childhood cerebral form (22 patients, 78.6%). The median age at symptom onset was 7.4 years. Frequently reported initial observations were behavior or character changes (46.4%), gait disturbances (42.9%), strabismus (39.3%), reduced academic ability (32.1%), failing vision (21.4%), a positive family history (21.4%), clumsiness (17.9%), hearing disturbances (17.9%), convulsions (10.7%), and suspected psychiatric disorders (10.7%). The median duration from symptom onset to diagnosis was 12 months. The families of 12 patients (42.9%) with X-ALD who received HSCT were satisfied regardless of its effectiveness. Common concerns of patients' families were worries regarding heritability of X-ALD (78.6%), present symptoms (57.1%), frequent hospital visits (42.9%), problems at school or work (42.9%), economic issues (35.7%), and limited information regarding X-ALD (32.1%).

Conclusion: This is the first study clarifying the clinical characteristics of X-ALD and the concerns of patients' families using the registry system. Investigation of rare diseases using registry systems is very valuable for the understanding of such conditions.