Disability Severity Scale (DSI) and Hereditary Motor and Sensory Neuropathy Overall Disability Scale (HMSN-R-ODS)

Study Overview
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Brief Summary
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The purpose of this research study is to create and validate two patient reported outcome (PRO) questionnaires. PRO questionnaires ask questions that help to measure disability in patients with inherited neuropathies. These questionnaires ask questions about what participants think disability is for themselves or others with inherited neuropathies. These questionnaires are a useful tool when evaluating whether treatments are working in the day to day life of an individual, although there are currently no questionnaires available specifically for people who have Charcot Marie Tooth disease (CMT).

Detailed Description
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Charcot Marie Tooth Disease (CMT) is a group of disorders that cause a peripheral neuropathy, impairing the long nerves that go to the feet and hands. Due to the problems with the peripheral nerves, people with CMT have muscle weakness and sensory loss that impairs their physical abilities. CMT affects approximately 1 in 2500 people and is caused my mutations in over 70 different genes. Models exist for many sub-types of CMT that have led to an increased understanding of the biological basis for these disorders. These advances have also made rational therapies for CMT a realistic possibility. However, clinical trials have been limited in CMT by a combination of lack of natural history data for many subtypes, a lack of outcome measures that can detect change in a short period for slowly progressive forms of CMT, and a lack of outcome measures for young children with CMT. In order to develop treatments based on the biological advances in the inherited neuropathies, it is necessary to have measured the natural history of the various disorders. It is only by knowing the natural history that one understands the onset of clinical symptoms, the rate of progression, and the ultimate prognosis of these diseases. For these reasons, the INC has dedicated much of its effort to develop sensitive outcome instruments, including PRO tools, to measure the natural history of CMT. It is the investigators goal to establish such an instrument for overall impairment for use in both natural history analysis and clinical trials. To develop and validate this instrument, the investigators will be asking people who have CMT to complete two questionnaires, the DSI and the HMSN-R-ODS. These relate to overall symptom impairment due to CMT. These instruments may be used to help us understand the overall progression of CMT and will ultimately help with clinical trials when they are available for the various forms of CMT.

Official Title
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Disability Severity Scale (DSI) and Hereditary Motor and Sensory Neuropathy Overall Disability Scale (HMSN-R-ODS)

Conditions
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Charcot Marie Tooth Disease, Inherited Peripheral Neuropathy

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: individual has an inherited peripheral neuropathy or is suspected to have an inherited peripheral neuropathy individual is 10-99 years of age individual signs consent or assent form depending on age and requirements individual is participating in INC 6601 at one of the participating sites OR is a participant on the INC Patient Registry Exclusion Criteria: inability to provide informed consent outside of age range inability to complete questionnaire does not understand English is not participating in INC 6601 or on the INC Patient Registry

Ages Eligible for Study
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Minimum Age: 10 Years

Sexes Eligible for Study
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All

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 |
| --- | --- |
| Participants evaluated at INC sites<br>Participants being evaluated at the INC sites will participate in both the DSI and HMSN-R-ODS by completing these PROs during their visit. | |
| INC Contact Registry<br>INC Contact Registry completes the HMSN-R-ODS on web http://rarediseasesnetwork.epi.usf.edu/INC/ | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Disability Severity Index | The DSI asks the subject to provide information about how disability is reflected in general by equipment required for mobility. Therefore, the DSI asks the subject if a person in general was wearing AFOs (braces) for mobility, what level of disability would that reflect using both a quantitative measurement of score and a verbal method of scoring (none, mild, moderate, severe). These questions do not apply to the participant themselves, just in general how disabled they believe a person to be based on the mobility assistive devices that that person requires. Then a research team member will complete the last page which specifically asks about what that subject is using for mobility. | Approximately 30 minutes | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Hereditary Motor and Sensory Neuropathy Overall Disability Scale (HMSN-R-ODS) | The HMSN-R-ODS is a functional score about the subject asking about their daily activities and overall health. Questions are grouped in various sections and include: Changing and holding body positions; walking and movement; movement by transport; carrying, moving, or handling objects; self-care; household activities and duties; taking care (daily tasks) - general; meeting other people; work, study, and hobbies. These questions relate specifically to the subject and ask how they can perform these various activities with little to severe difficulty. | Approximately 30 minutes | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Outcome Measure, Patient Reported Questionnaires