Raptor Announces Clinical Results With RP103 in Huntington’s Disease Phase 2/3 Trial

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NOVATO, Calif., Feb. 20, 2014 (GLOBE NEWSWIRE) — Raptor Pharmaceutical Corp. (Nasdaq:RPTP) today announced top line results from a planned 18 month analysis of an ongoing 3 year Phase 2/3 clinical trial of RP103 (delayed-release cysteamine) for the potential treatment of Huntington’s disease (HD) in collaboration with the Centre Hospitalier Universitaire d’Angers (CHU d’Angers). A total of 96 patients with HD were randomized to treatment with RP103 or placebo. Eighty nine patients completed the initial 18 month phase. Analysis of all 96 patients enrolled in the trial showed a positive trend towards slower progression of Total Motor Score (TMS) in patients treated with RP103 vs. those patients on placebo, the primary endpoint of the study. TMS progression was 32% slower in patients treated with RP103 vs. those treated with placebo after 18 months treatment (4.51 vs. 6.68 respectively, p=0.19). In 66 patients not taking concurrent tetrabenazine, RP103 treatment resulted in a statistically significant slower progression in TMS vs. the placebo group (2.84 points vs. 6.78 respectively, p=0.03).

Due to the 36 month duration of the study, patients were allowed to continue their baseline medication regime, including antidepressants and tetrabenazine, the latter being an approved medication to treat chorea associated with HD. Patients were not randomized in the study based on concomitant medications. To confirm that the TMS results were not influenced by a potential treatment effect of tetrabenazine on chorea (a sub-score of TMS) the subset of patients not receiving tetrabenazine were analyzed for TMS. In these 66 patients (32 under placebo and 34 under RP103), RP103 treatment caused a statistically significant 58% slower progression in TMS of 2.84 points compared to 6.78 points for placebo (p=0.03) at 18 months. Slower progression was seen across all TMS sub-score measurements including eye and hand movements, balance and gait, as well as maximal dystonia and maximal chorea. Adverse events were similar in the two groups and were comparable to what has been observed in other studies in this patient population.

“We are very encouraged by these trial results and we believe that the significant slowdown of loss of muscle control in these early stage patients indicates that RP103 is potentially effective at slowing the progression of Huntington’s disease,” said Dr. Christophe Verny, Lead Investigator for the Phase 2/3 clinical trial and Chief of Neurology Department at CHU d’Angers. “We look forward to working with Raptor to develop and implement a continuing access program so that we can continue to provide RP103 to the patients who participated in the study initiated by CHU d’Angers, and avoid any treatment interruption after they finish the study.”

“We are very grateful to the patients who participated in the study and the French clinical network of physicians, led by Drs. Christophe Verny and Dominique Bonneau in Angers,” said Patrice Rioux, M.D., Ph.D., Chief Medical Officer at Raptor. “We are thrilled to build on these results and will engage regulatory agencies to discuss the most efficient means to advance this program to potential approval. These results not only support the safety and efficacy of Raptor’s RP103 in Huntington’s disease, but also the rationale for testing the use of RP103 in other indications such as NAFLD, Leigh Syndrome and mitochondrial diseases.”

RP103 was well tolerated with 48/52 patients experiencing at least one adverse event (AE) during the 18 month study vs. 38/44 under placebo. There were slightly more patients under RP103 than under placebo reporting at least one gastrointestinal AE (61.5% RP103 vs. 45.5% placebo), mostly nausea, vomiting, abdominal pain, constipation and breath odor. There were also slightly more headache AEs on RP103 than on placebo. There were 5 patients treated with RP103 who experienced serious adverse events (SAEs) compared with 4 patients treated with placebo.

Clinical Study Design

The study enrolled 96 patients who were randomized in a double blind, 1:1 ratio to RP103 or placebo for an initial 18 month treatment period followed by 18 months open label treatment with RP103. Concomitant medications were not taken into account in the randomization. Eighty nine patients completed the first 18 month phase. The study enrolled primarily Stage 1/2 patients showing early disease symptoms with a Unified Huntington Disease Rating Scale (UHDRS), Total Motor Score (TMS) ≥ 5, Total Functional Capacity > 10 and a CAG repeat > 38. The trial was conducted at eight clinical sites throughout France under a collaboration agreement between Raptor and CHU d’Angers. Clinical expenses of the study are covered by a grant from the French government (PHRC 2004-03bis CYST-HD).

The objective of the study is to evaluate the effectiveness, safety and tolerability of RP103 in modifying Huntington’s disease progression. The primary endpoint of the study is the change from baseline in the TMS sub-scale of the UHDRS at 18 months of treatment in the placebo and RP103 treated groups. The study was powered to detect a difference in TMS in as few as 62 patients at 18 months. Due to the duration of the study, patients were permitted to continue taking their normal medication regime which included tetrabenazine, a vesicular monoamine transporter 2 inhibitor.

Seven patients discontinued treatment during the study, 6 in the RP103 arm and 1 in placebo. Three patients receiving RP103 discontinued for SAEs including 1 for lymphopenia, 1 for repetitive faintness and 1 for elevated liver enzymes. One SAE in the placebo group, anxiety, resulted in discontinuation.

Conference Call and Webcast

Raptor has scheduled an investor conference call and webcast regarding this announcement at 8:30 a.m. EST (5:30 a.m. PST), February 20, 2014. The live call may be accessed by dialing (877) 870-4263 for domestic callers or (412) 317-0790 for international callers. A live webcast of the conference call will be available online from the investor relations section of the company website at www.raptorpharma.com.  After the call, a webcast replay will be available on the Raptor website for 90 days. A telephone replay of the call will be available by dialing (877) 344-7529 for domestic callers, or (412) 317-0088 for international callers, and entering the conference number: 10041359.

About Huntington’s Disease

Huntington’s disease is a rare, progressive, and hereditary neurological disease that often leads to death within 15 to 20 years after diagnosis. The disease is thought to affect as many as 18,000-30,000 patients in the U.S. and a comparable number in Europe. There are currently no disease modifying therapies approved for Huntington’s disease. HD causes neuronal degeneration in the cerebral cortex and basal ganglia, which play a key role in movement and behavior control. The cumulative damage to these areas results in the hallmark symptoms of chorea (uncontrollable, jerky movements), neuropsychiatric symptoms, loss of executive functioning and dementia.

About Raptor Pharmaceutical

Raptor Pharmaceutical Corp. is a global biopharmaceutical company focused on the development and commercialization of life-altering therapeutics that treat rare, debilitating and often fatal diseases. The company is engaged in multiple therapeutic areas such as nephropathic cystinosis, Huntington’s disease, nonalcoholic fatty liver disease, Leigh syndrome and other mitochondrial diseases.  With an approved product in the U.S. and EU, Raptor also holds several orphan drug designations, including U.S. orphan drug designation for RP103 in Huntington’s disease.  A request for EU designation for RP103 in HD will be submitted with clinical data. Raptor holds intellectual property for the use of cysteamine in HD and other neurodegenerative disorders including Parkinson’s disease, Rett Syndrome and the treatment of MeCP2-associated disorders. For additional information, please visit www.raptorpharma.com.  

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Source: Raptor Pharmaceutical Corp



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