Hong Kong Spinocerebellar Ataxias Registry

Study Overview
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Brief Summary
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Spinocerebellar ataxias (SCA) 1, 2, 3 and 6 are the most common, autosomal dominantly inherited cerebellar degenerations. And in the Chinese population, the most common SCA is SCA3 and the frequency of SCA 3 among SCA patients is 72.5%, followed by SCA 2 that the frequency is 12% among SCA patients. For SCA 1, the frequency among SCA patients is 7%. Even SCAs are rare diseases, a significant amount of Chinese in Hong Kong still suffer from this disorders. SCA Association in Hong Kong has 88 members who are suffering from spinocerebellar degeneration, many of them have a genetic confirmation. As there are few treatments for SCAs; therefore, understanding SCAs clinical manifestation and disease mechanisms are the first step towards development of effective treatment. The objective of this study is to develop the first SCA registry in Hong Kong with bio-repository bank for clinical and genetic information as well as serum and fibroblasts.

Detailed Description
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All the members from Hong Kong SCA association will be invited and discuss the study with them. After obtaining the informed consent, their genotypes will be determined and collect clinical information. Some of the participant will have clear genotyping via Department of Health. Participants with a genetic confirmation of SCA1, 2, 3, 6, 7, 8 and 12 genes will be included in the study. The relatives of genetically confirmed participants, who also had ataxic symptoms, might be included in the study without further determination of the genotypes. Detailed clinical history including age of onset, clinical symptoms will be collected. A detailed neurological examination with an emphasis of eye movements (such as pursuit, saccadic, and convergence eye movements). We will also perform SARA scale, a validated ataxia scale. Timed 25 foot-walk test will be performed. Two-year annual follow-up will be arranged for recruited subject for neurological physical examination, SARA scale, in order to continue assessment for any progress change in disease stage.

Official Title
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Hong Kong Spinocerebellar Ataxias Registry

Conditions
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Spinocerebellar Ataxia

Intervention / Treatment
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* Other: no intervention


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age 18 years and above Presence of symptoms and signs of ataxia Definite molecular diagnosis of SCA1, 2, 3, 6, 7, 8 or 12 either in the participant or another affected family member Willingness to participate in the study and ability to give informed consent Exclusion Criteria: 1. Known recessive. X-linked, and mitochondrial ataxias

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 90 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Intervention/Treatment |
| --- |
|Other: no intervention|No intervention but clinical assessement for all recruited subjects|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Scale for the assessment and rating of ataxia (SARA) score | Scale for the assessment and rating of ataxia (total score 0-40) | change from baseline to 2-year follow up | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| EQ5D Health questionnaire | EQ-5D is a standardized instrument for measuring generic health status. The health status measured with EQ-5D is used for estimating preference weight for that health status (1-3 in each health status , 0-100 in general today's health status) | change from baseline to 2-year follow up | 
| Patient Health Questionnaire-9 (PHQ-9) | Depression scale (0-4 in each items) | change from baseline to 2-year follow up |