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Researchers at Kessler Foundation conducted a comprehensive review of pharmacologic agents used in the treatment of multiple sclerosis, seeking evidence for efficacy for the cognitive dysfunction experienced by more than half of affected individuals. The team identified 87 articles, using the PubMed and PsycINFO databases and the 2017 American Academy of Neurology (AAN) criteria for therapeutic trials. Standardized effect sizes were calculated for comparison across trials.
Agents from the following therapeutic categories were represented: Disease-modifying therapies (DMTs) (interferon B-1a, B1b, glatiramer acetate, natalizumab, fingolimod); Symptomatic therapies (dalfampridine; cognition enhancers: rivastigmine, Gingko biloba, donepezil; Stimulants: modafinil, armodafinil, methylphenidate, amphetamine sulfate, amantadine); and Other therapies that were neither DMTs nor stimulants (eg, estrogen, methylprednisolone, simvastatin, human erythropoietin).
Review of the studies of DMTs failed to support effectiveness for treating cognitive deficits, with a majority of class III and IV evidence. "We found no class I evidence, and class II evidence was minimal to none," said Dr. Chen, postdoctoral fellow in the Center for Neuropsychology and Neuroscience Research at Kessler Foundation.
Although most of the studies of symptomatic therapies were randomized controlled trials with primary cognitive outcomes (i.e., higher quality evidence), there were contradictory findings, resulting in inconclusive evidence for the cognitive efficacy of symptomatic therapies. For studies involving other agents, there was again insufficient evidence to support their use to treat cognitive problems.
In summary, there was insufficient evidence for cognitive efficacy across the spectrum of pharmacologic agents used in the treatment of multiple sclerosis. "Given the impact of cognitive dysfunction on individuals with MS, it is prudent to explore the potential for cognitive efficacy of available pharmaceuticals," explained Dr. Genova, director of the Center for Neuropsychology and Neuroscience Research. The design of future studies, especially of DMTs, must focus on cognitive outcomes and follow standardized criteria such as the AAN's," she said in conclusion. "Randomized, controlled studies with cognition as the primary outcomes will provide clinicians with the information they need to choose optimal treatments for patients."
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New Drugs Required To Treat Cognitive Symptoms of MS - Technology Networks
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