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Neurim Pharmaceuticals Announces Positive Phase 2 Clinical Trial Results of Piromelatine for the Treatment of Insomnia

ZURICH, February 18, 2013 /PRNewswire/ --

Neurim Pharmaceuticals announced today positive results from a phase II clinical study evaluating the efficacy and safety of Piromelatine (Neu-P11), a novel investigational multimodal sleep medicine developed for the treatment of patients with primary and co-morbid insomnia. The new results are from a  recent double-blind, randomized, placebo controlled, parallel group, non-confirmatory, sleep-laboratory study. The study evaluated piromelatine compared to placebo in 120 adult primary insomnia patients ages 18 years and older.

Piromelatine 20/50mg treatment for 4 weeks resulted in statistically significant and clinically meaningful improvements relative to placebo in key  polysomnographic (PSG) parameters including Wake After Sleep Onset (WASO) (p=0.02 for both doses) and in particular WASO for the first 6 hours of sleep (WASO-6h) (p=0.0008 and p=0.04 for the 50 mg and 20 mg groups, respectively). Piromelatine 50 mg also improved Sleep Efficiency (SEF) (p=0.02), Total Sleep Time (TST) (p=0.02), Total Time Awake (TTA) (p=0.01) and time in NREM sleep (p=0.028) indicating beneficial effects on sleep maintenance. Subjective improvements relative to placebo in quality of sleep and total sleep time measured by the Pittsburg Sleep Quality Questionnaire (PSQI) were also observed, confirming the PSG findings. Piromelatine enhanced NREM sleep EEG delta power and significantly reduced beta power (p<0.05). The decrease in EEG beta activity, a marker of cortical arousal, is a physiological surrogate marker of the efficacy of Piromelatine in sleep maintenance. Piromelatine was generally safe and well tolerated, had no detrimental effects on next-day psychomotor performance (as assessed by the Digit Symbol Substitution Test (DSST)) for any dose group and no deleterious effects on sleep structure and architecture.

"Piromelatine demonstrates a good potential for the treatment of primary insomnia characterized by sleep maintenance disturbances as well as insomnia with psychiatric or medical co-morbidities" said Prof. Nava Zisapel, CSO of Neurim. The study results will be presented at the 27th Annual Meeting of the Associated Professional Sleep Societies (APSS) -Sleep 2013 meeting in Baltimore.

About Piromelatine:

Piromelatine is thought to work through a combination of MT1\MT2 (potential sleep promoting and chronobiotic effects) and 5HT1A\D (potential anxiolytic and analgesic effects) receptors agonism. All potential effects of piromelatine were demonstrated in relevant animal models. Phase-IA and IB studies of safety, tolerability, pharmacokinetics and sleep promoting activity of piromelatine demonstrated dose proportionality PK profile, good absorption and distribution, good safety & tolerability profile across a wide dose range and provided the first indication for a pharmacodynamic activity of Piromelatine on sleep maintenance with no detrimental effects on memory. 

About  Neurim Pharmaceuticals:

Neurim Pharmaceuticals Ltd., founded in 1991 is a drug discovery and development company focused on the central nervous system (CNS). It's first approved drug, Circadin® - prolonged release melatonin for insomnia is commercially available in more than 40 countries around the world.

For more information:
Eran Schenker, MD
Medical & Corporate Business Development Director
Neurim Pharmaceuticals Ltd. 27 Habarzel  St Tel-Aviv 69710 Israel
Tel: +972-3-7684914 Cell: +972-52-6689944 [email protected]  

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