Study of Disease Progression in Adults With Inherited Forms of Spastic Paraplegia

Study Overview
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Brief Summary
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The course of AMN-related disabilities over time is poorly or incompletely understood due to a limited number of patients and lack of treatments. This study will help obtain a better understanding of the progression of disease with AMN and facilitate efficient clinical development of future interventional medications.

Detailed Description
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Progressive weakness and spasticity of the legs are characteristics of numerous disorders and conditions, including those that are inherited neurological disorders. Adrenomyeloneuropathy (AMN) is an example of an inherited form of spastic paraplegia. Adrenoleukodystrophy (ALD) is a progressive neurodegenerative disorder caused by a mutation in the ABCD1 gene localized to the X-chromosome (Xq28). The ABCD1 gene encodes a peroxisomal adenosine triphosphate (ATP) binding cassette transporter responsible for transport of very long chain fatty acids (VLCFA) from the cytosol into the peroxisome for degradation. A mutation in ABCD1 results in reduction in the degradation of the VLCFA by peroxisomal β-oxidation, and saturated VLCFA, in particular C26:0, accumulate in tissues and body fluids (i.e., brain, nervous system, adrenal glands). One of the key clinical symptoms during aging of ALD patients is a slowly progressive axonopathy affecting sensory ascending and motor descending spinal cord tracts with 100% penetrance in men, an ALD phenotype known as AMN. There are no treatment options available, which leaves AMN patients with a progressive disorder that leads to lifelong physical disability. The progressive dying-back axonopathy represents the core clinical feature of AMN, with onset usually between 20 and 30 years of age in male participants. The initial symptoms include progressive stiffness and weakness of the legs, impaired vibration and position senses in the lower limbs, falls, sphincter disturbances and impotence, as well as scarce scalp hair (alopecia). About 66% of male AMN patients have adrenocortical insufficiency (Addison disease). The course of AMN-related disabilities over time is poorly or incompletely understood due to a limited number of patients and lack of treatments. This study will help obtain a better understanding of the progression of disease with AMN and facilitate efficient clinical development of future SwanBio interventional medications.

Official Title
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Prospective, Retrospective, Multicenter, Observational Study of Disease Progression in Adults With Inherited Forms of Spastic Paraplegia

Conditions
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AMN, AMN Gene Mutation, X-ALD

Intervention / Treatment
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* Other: Natural History Observation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male adults aged ≥18 years Diagnosed with ALD based on elevated VLCFA assay and pedigree analysis Clinical evidence of spinal cord involvement with EDSS score between 1 and 6.5 Exclusion Criteria: Diagnosed with cerebral inflammatory disease or has a history of diagnosis with cerebral inflammatory disease Unstable, clinically significant neurologic (other than the disease being studied), psychiatric, cardiovascular, ophthalmologic, pulmonary, hepatic, renal, metabolic, gastrointestinal, urologic, immunologic, hematopoietic, or endocrine disease (other than adrenal insufficiency) or other abnormality, which may impact the ability to participate in the study or that may potentially confound the study results Participant who, in the opinion of the Investigator, has any other medical or psychological condition or social circumstances which would impair their ability to participate reliably in the assessments, or who may increase the risk to themselves or others by participating

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Males with AMN<br>Adult males with confirmed diagnosis of ALD and symptoms of AMN. | Other: Natural History Observation<br>* Data collection on progression of disease<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Disease progression | Characterize disease progression in adults diagnosed with AMN in serial clinical evaluations of walking | 5 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Quality of Life | Characterize the Change in multiple Quality of Life (QoL) parameters over time | 5 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Leukoencephalopathies, AMN, X-ALD, Natural History, Adrenoleukodystrophy, X-linked Adrenoleukodystrophy, Adrenomyeloneuropathy, Myeloneuropathy, Spastic paraplegia, Hereditary Spastic Paraplegia, HSP, ALD, ABCD1, ALDP, CALD, CCALD, Brain Diseases, Metabolic, Inborn, Brain Diseases, Metabolic, Hereditary Central Nervous System Demyelinating Diseases, Demyelinating Diseases, Heredodegenerative Disorders, Nervous System, Metabolism, Inborn Errors, Peroxisomal Disorders, Metabolic Diseases, Adrenal Insufficiency