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Abstract Title:

Ethyl-EPA in Huntington disease: a double-blind, randomized, placebo-controlled trial.

Abstract Source:

Neurology. 2005 Jul 26;65(2):286-92. PMID: 16043801

Abstract Author(s):

B K Puri, B R Leavitt, M R Hayden, C A Ross, A Rosenblatt, J T Greenamyre, S Hersch, K S Vaddadi, A Sword, D F Horrobin, M Manku, H Murck

Abstract:

BACKGROUND: Preliminary evidence suggests beneficial effects of pure ethyl-eicosapentaenoate (ethyl-EPA) in Huntington disease (HD). METHODS: A total of 135 patients with HD were randomized to enter a multicenter, double-blind, placebo-controlled trial on the efficacy of 2 g/d ethyl-EPA vs placebo. The Unified Huntington's Disease Rating Scale (UHDRS) was used for assessment. The primary end point was outcome at 12 months on the Total Motor Score 4 subscale (TMS-4). Analysis of covariance (ANCOVA) and a chi2 test on response, defined as absence of increase in the TMS-4, were performed. RESULTS: A total of 121 patients completed 12 months, and 83 did so without protocol violations (PP cohort). Intent-to-treat (ITT) analysis revealed no significant difference between ethyl-EPA and placebo for TMS-4. In the PP cohort, ethyl-EPA proved better than placebo on the chi2 test on TMS-4 (p < 0.05), but missed significance on ANCOVA (p = 0.06). Secondary end points (ITT cohort) showed no benefit of ethyl-EPA but a significantly worse outcome in the behavioral severity and frequency compared with placebo. Exploring moderators of the efficacy of ethyl-EPA on TMS-4 showed a significant interaction between treatment and a factor defining patients with high vs low CAG repeats. Reported adverse events were distributed equally between treatment arms. CONCLUSIONS: Ethyl-eicosapentaenoate (ethyl-EPA) (purity > 95%) had no benefit in the intent-to-treat cohort of patients with Huntington disease, but exploratory analysis revealed that a significantly higher number of patients in the per protocol cohort, treated with ethyl-EPA, showed stable or improved motor function. Further studies of the potential efficacy of ethyl-EPA are warranted.

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Sayer Ji
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