Cognitive Evolution in Tysabri Treated Multiple Sclerosis Patients - A Three Year Extension

Study Overview
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Brief Summary
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This study is designed to demonstrate that Tysabri is effective in maintaining cognition in MS patients after 5 or more years of continuous treatment. During a second period of 36 months, the extension study will assess the evolution of cognitive function in Tysabri treated MS patients using the Symbol Digit Modalities Test (SDMT) and a CogState battery of tests.

Detailed Description
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Tysabri reduces the relapse frequency, slows progression and preserves cognitive function as compared to placebo as per the AFFIRM trial. The benefit on relapse rate and progression appears to be sustained in longer-term studies such as STRATA. In clinical practice however despite a stable EDSS patients often complain of cognitive deterioration. The investigators' preliminary results from the first pilot study have shown that cognition in Tysabri treated MS patients for two or more years, as measured by the SDMT or Cogstate battery is maintained, including the ability to learn. The investigators' final data will be presented at the American Academy of Neurology (AAN) in 2015. The Symbol Digit Modalities Test (SDMT) is a sensitive and validated test of cognition in MS. CogState offers a standardized battery of cognitive tests frequently used in clinical research in the fields of dementia and Parkinson's disease. The CogState battery of tests consisting of the Detection test (processing speed), Identification test (attention), One Back test (working memory), International Shopping List test (verbal learning) and the Groton Maze Learning test (reasoning and problem solving) will further confirm and validate the results of the SDMT in MS patients as well as examine other cognitive domains. The Beck Depression Inventory-II [Beck 1996] is a validated and well recognized clinical research tool for depression in the field of multiple sclerosis. Together the above tests done prospectively can assess the evolution of cognitive function in Tysabri treated MS patients over the longer term.

Official Title
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Cognitive Evolution in Tysabri Treated Multiple Sclerosis Patients - A Three Year Extension

Conditions
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Multiple Sclerosis

Intervention / Treatment
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* Other: Observational Cognitive assessments


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients who have completed the original study and are willing to continue into the extension. Exclusion Criteria: Patients with cognitive decline from causes other than MS (i.e., PML, stroke, sleep apnea, neurodegenerative disorders, brain tumors).

Ages Eligible for Study
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Minimum Age: 18 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

| Intervention/Treatment |
| --- |
|Other: Observational Cognitive assessments|Observational|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| SDMT | Cognitive assessment | 3 years | 
| Cogstate Battery | Cognitive assessment | 3 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Multiple Sclerosis, Cognition