NuPathe Inc, a specialty pharmaceutical company developing innovative products for the treatment of neurological and psychiatric diseases, announced top-line results from the pivotal phase-III clinical trial of Zelrix, a novel transdermal patch in clinical development for the treatment of acute migraine. In this multi-centre, randomized, parallel group, double-blind, placebo-controlled trial, the efficacy and tolerability of Zelrix were compared with placebo in a total of 530 adults.

The Zelrix patch combines NuPathe's proprietary SmartRelief iontophoretic transdermal technology with sumatriptan, the most prescribed treatment for acute migraine in the United States. "Zelrix was designed to overcome key barriers to successful treatment of migraine: treatment-altering nausea, treatment-limiting side effects, and inconsistent drug absorption," said Jane Hollingsworth, chief executive officer of NuPathe.

According to the National Headache Foundation, 55 per cent of migraine sufferers frequently experience nausea as part of their migraine attacks commonly resulting in patients delaying, modifying, or skipping treatment. Concerns about treatment-related side effects also lead patients to delay, modify, or skip treatment in over one-third of migraine attacks. Moreover, many patients experience inconsistent relief, which experts attribute, in part, to substantial variation in oral drug absorption.

Results of the pivotal phase-III clinical study demonstrated statistically significant improvement for patients two hours after applying the Zelrix patch compared to patients applying a placebo patch for each of the five key efficacy endpoints:

Zelrix was well-tolerated in the trial. Skin tolerability was typical of other transdermal products with mild to moderate erythema present upon patch removal. The incidence of triptan-specific adverse events was very low. The most common adverse events were itching, pain, and tingling at the application site. The majority of adverse events were reported as mild and transient.

"The pivotal phase-III results confirm that Zelrix provides clear clinical benefits for patients. Zelrix demonstrated efficacy consistently across all symptoms of acute migraine combined with a very low incidence of triptan adverse events," said Mark Pierce, chief scientific officer at NuPathe. "Patients need a migraine treatment that can deliver effective relief in a well-tolerated manner without being undermined by the treatment-altering nausea, vomiting, or other gastric symptoms associated with migraine. This milestone brings NuPathe one step closer to bringing the first and only migraine patch to the market. We look forward to submitting an NDA for Zelrix in 2010."

NuPathe plans to present a comprehensive summary of the data from this trial at the upcoming 14th Congress of the International Headache Society being held in Philadelphia from September 10-13, 2009.

Zelrix is a novel migraine therapy in clinical development for the treatment of acute migraine.

NuPathe Inc is a specialty pharmaceutical company developing innovative therapeutic products for the treatment of neurological and psychiatric diseases.