The authors estimated the sample sizes needed for exploratory trials of MS assessing the efficacy of new treatments in reducing the number of new enhancing lesions vs those of interferon-beta or glatiramer acetate. The sample sizes per arm ranged from 868 (effect: 20%) to 94 (effect: 50%) for patients with relapsing-remitting MS and from 2,484 (effect: 20%) to 361 (effect: 50%) for patients with secondary progressive MS. In MS, exploratory trials of new vs available therapies require large numbers of patients, even when MR end-points are used.
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| http://dx.doi.org/10.1212/wnl.57.10.1883 | DOI Listing |
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