Multiple Sclerosis Clinical Trial
Official title:
Cognitive Evolution in Tysabri Treated Multiple Sclerosis Patients
This study is designed to evaluate the effect of Tysabri on cognition in multiple sclerosis (MS) patients. During a period of 24 months, the study will assess the evolution of cognitive function in Tysabri treated MS patients using the Symbol Digit Modalities Test (SDMT) and the CogState battery of tests.
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 condition on the Expanded Disability Status Scale (EDSS) patients often
complain of cognitive deterioration. It has yet to be shown that Tysabri will prevent
cognitive deterioration after more than 2 years of treatment.
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 Symbol Digit Modalities Test(SDMT) in MS patients as well as examine other
cognitive parameters.
Together the above tests done prospectively can assess the evolution of cognitive function in
Tysabri treated MS patients over the longer term.
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