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|September 19, 2016 7:01 a.m.|
|Teva Announces Results from Exploratory 52-Week Phase 2 PRIDE-HD Study of Pridopidine in Huntington Disease|
Pridopidine Demonstrates Slowing of Progression of Huntington Disease in PRIDE-HD Study as Measured by Total Functional Capacity
An unusually high placebo effect, extending beyond that expected from previous studies, limited the ability to determine treatment effects on assessments of HD motor scores. Evidence of symptomatic impact, however, was seen in the early stage HD patient sub-population, with improvement in Total Motor Score (TMS) and dystonia observed at 26 and 52 weeks in this patient sub-set (stage 1 HD) at specific doses.
The discovery of pridopidine's previously unknown mode of action as a potent agonist of the Sigma 1 Receptor (S1R) resulted in a change in PRIDE-HD study design, from a 26-week study focused on symptoms, to a 52-week study focused on exploring pridopidine’s potential impact on disease progression, as measured by Total Functional Capacity (TFC). TFC is the most widely accepted and validated tool for assessing disease stage in HD. It has been used as the endpoint in more than 10 previous clinical trials of drugs seeking to demonstrate an impact on HD progression, none of which were successful.
This study showed a statistically significant impact on the endpoint of disease progression at 52 weeks following treatment with pridopidine at certain doses versus placebo, as measured by TFC. The effect of pridopidine was further evident in a sub-population of patients with early stage HD, an effect first observed at 26 weeks.
Improvements were seen for early stage HD patients in elements that make up TFC, such as ability to undertake domestic chores, activities of daily living and impact on ability to manage finances. Patients' mobility and ability to move around (ambulation) may have contributed to improved TFC scores, with multiple ambulation-related endpoints (such as gait, walking, ability to get up from sitting and walk, and stair climbing) demonstrating trends favoring pridopidine.
Safety and tolerability were consistent with the safety profile seen in previous studies and compatible with continued development. No new safety findings were reported.
These results were presented at the 9th European Huntington Disease
Network Plenary Meeting in
"I am encouraged by these results, which provide us with clear insights
into the approach to be taken in Phase 3 development", said
"These study results are very important for the HD community and for the
continued development of pridopidine. Firstly, pridopidine’s safety
profile has been confirmed and extended. Secondly, we now have a clearer
idea of the dosages to study in Phase 3. Lastly, we have some of the
most encouraging evidence to date about an intervention which may slow
the inexorable functional decline of HD," said
"Slowing down the progression of this disease has proven to be impossible until now. These findings give us a reason to believe we may be finally making progress in slowing deterioration of disease," said Spyros Papapetropoulos, Teva's Vice President of Clinical Development, Neurodegenerative Diseases.
The results seen in this exploratory study will need to be confirmed in a Phase 3 program that will be developed in collaboration with relevant regulatory agencies.
Pridopidine is an investigational, oral small molecule being developed for the treatment of HD that exerts its effect as an agonist of S1R. S1R plays a key role in neuroprotection through increased production of brain-derived neurotrophic factor (BDNF). Levels of BDNF are decreased in HD and other neurodegenerative disorders including Parkinson's disease, Alzheimer's disease and ALS.
About the PRIDE-HD Study
PRIDE-HD is a Phase 2, hypothesis-generating, dose-ranging, randomized,
parallel-group, double-blind, placebo-controlled study. The study was
directed towards measuring effects on HD progression and improvements in
motor function using pridopidine 45 mg, 67.5 mg, 90 mg, and 112.5 mg
twice daily versus placebo for the treatment in patients with HD.
PRIDE-HD enrolled 400 patients at 52 sites globally. Disease progression
outcomes were measured using the TFC scale. Patients were also assessed
using the Unified Huntington Disease Rating Scale Total Motor Score
(TMS). PRIDE-HD was conducted in collaboration with the European
Huntington's Disease Network and the
About Huntington Disease
HD is a fatal neurodegenerative disease for which there is no known cure or prevention. People who suffer from HD will likely have a variety of steadily-worsening symptoms, including uncoordinated and uncontrolled movements, cognition and memory deterioration and a range of behavioral and psychological problems. HD symptoms typically start in middle age, but the disease may also manifest itself in childhood and in old age. Disease progression is characterized by a gradual decline in motor control, cognition and mental stability, and generally results in death within 15 to 25 years of clinical diagnosis. Current treatment is limited to managing the symptoms of HD, as there are no treatments that have been shown to alter the progression of HD. Studies estimate that HD affects about 13 to 15 people per 100,000 in Caucasians, and for every affected person there are approximately three to five people who may carry the mutation but are not yet ill.
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