Neurologix Presents New Confirmatory Results for Phase 2 Study of NLX-P101 in Parkinson's Disease to Recombinant DNA Advisory Committee
Increased Medication "ON" Time and Reduced Medication Complications Reported with Overall Study Summary to Key Government Advisory Agency
FORT LEE, N.J., June 8, 2011 /PRNewswire/ -- Neurologix, Inc. (OTCBB: NRGX) announced today several new results from the Company's successful Phase 2 clinical trial for its novel, investigational gene therapy NLX-P101 for the treatment of Parkinson's disease (PD) as part of a comprehensive presentation of study findings to the National Institutes of Health (NIH) Recombinant DNA Advisory Committee (RAC). Recently completed analysis of new data showed patients treated with NLX-P101 had significantly increased "ON" times, or periods in which the symptoms of PD are best controlled, compared to sham subjects over the course of 12 months following treatment (p<0.05; ANOVA). Significant reductions in complications due to medical therapy were also seen following treatment with NLX-P101. These new findings, which demonstrate patients treated with NLX-P101 maintained statistically significant, positive, long-term improvements at 12 months, were included in today's presentation of results from the landmark Phase 2 trial by Matthew J. During, M.D., D.Sc., one of the scientific co-founders of Neurologix.
Patients with moderate to advanced PD often suffer from reduced effectiveness of medication, including less time spent each day in the better or "ON" state. The new findings presented today of the NLX-P101 Phase 2 study demonstrated that treatment with the novel gene therapy resulted in an average daily increase of 2.5 hours of "ON" time at 3 months (p<0.01 relative to baseline; t-test) and this increase was sustained at 2.1 hours of greater "ON" time at 12 months (p<0.01 relative to baseline; t-test). There was no significant increase in "ON" time in sham patients at any time point.
There was also a significant reduction in complications of medication in the NLX-P101 group at 6 and 12 months following treatment (p<0.01 and p<0.05, respectively; t-test) as measured by Part 4 of the Unified Parkinson's Disease Rating Scale (UPDRS), with no such reduction in the sham group at any time point. Furthermore, 35% of sham subjects were reported to have worsening PD symptoms as an adverse event during the one year follow-up, consistent with the progressive nature of the disease, whereas such an adverse event was not recorded in a single NLX-P101 subject (p<0.005; Fisher's exact test).
"We were very pleased to be able to summarize our results to date for the RAC, which is an important step in our progress toward a definitive Phase 3 study," said Dr. During, Professor of Molecular Virology, Immunology and Medical Genetics, Neuroscience and Neurological Surgery, The Ohio State University Medical School, and Professor of Molecular Medicine and Pathology, University of Auckland, New Zealand. "These new results provide strong support for our earlier observation that NLX-P101 can substantially improve effectiveness of medications in patients who are no longer adequately responding to treatment while reducing complications of these same therapies. These findings support the results of our 2002 preclinical study reported in the journal Science in which we showed that GAD gene transfer is neuroprotective and provides encouragement that NLX-P101 may also have a disease-modifying effect. The strong results observed in both our Phase 1 and now Phase 2 studies increase our confidence in the potential of NLX-P101, and, combined with the outstanding safety profile to date, further justifies our plans to move toward the first Phase 3 trial for gene therapy in the treatment of this debilitating disease."
The six month results of the Company's landmark Phase 2 study were published in the peer-reviewed journal The Lancet Neurology in March of this year. Study results through six months of follow-up showed that NLX-P101 treatment led to a mean 23.1 percent improvement (8.1 points) in off-medication UPDRS motor score at the six-month study end-point, compared to a mean 12.7 percent improvement (4.7 points) with sham treatment. Improved motor control in the NLX-P101 group was seen at one month and continued virtually unchanged throughout the blinded six month study period. The improvement in UPDRS motor scores from baseline in the NLX-P101 group was significantly greater than sham subjects over the six month study period (p=0.04). Last month, the one year follow-up results of these primary outcomes were presented at the International Neuromodulation Society's 10th World Congress meeting by Neurologix scientific co-founder Michael G. Kaplitt, M.D., Ph.D., Associate Professor of Neurological Surgery at Weill Cornell Medical College. He reported sustained improvement of an average of 8.2 points in the off-medication UPDRS motor score at one year. Furthermore, while 50% of patients at six months achieved previously defined moderate-to-large clinically meaningful symptom improvements (> 9 points in off-medication UPDRS motor score), 63% of patients achieved such results at one year, with an average 14 point, or 37% improvement in off-medication UPDRS motor scores in this group.
The Company's Phase 2 study findings build upon earlier positive results from the NLX-P101 Phase 1 trial, which appeared in 2007 as a cover article in The Lancet and in a second article in the Proceedings of the National Academy of Sciences. Neurologix plans to submit a Phase 3 protocol to the U.S. Food and Drug Administration (FDA) under a Special Protocol Assessment later in 2011.
"Neurologix is committed to providing patients a novel, sustained, long-term option for managing and controlling the debilitating conditions of Parkinson's disease," said Clark A. Johnson, President and Chief Executive Officer of Neurologix. "The statistically significant extension of "ON" time, lessening of medication side effects and favorable safety profile in the treated patient group at 12 months are encouraging results that further support NLX-P101 as a viable treatment option against Parkinson's. We look forward to the opportunity to conduct Phase 3 testing, with the goal to bring NLX-P101 to the market for patients in urgent need of a new treatment option."
Drs. During and Kaplitt have been at the forefront of gene therapy research since 1989 and the Phase 2 trial was the culmination of nearly 20 years of progress with their work in gene transfer technology using an adeno-associated virus (AAV) vector (a disabled, non-pathogenic virus). They were the first to demonstrate that AAV could be an effective gene therapy agent in the brain, which they reported in their landmark Nature Genetics paper in 1994. Drs. During, Kaplitt and colleagues subsequently published additional research demonstrating the beneficial effects of AAV-GAD gene therapy for PD in the journal Science in 2002.
About the Phase 2 Study
The trial involved 45 subjects with moderate to advanced PD who were not adequately controlled with current therapies. Medical centers that participated in the study included: Henry Ford Health System; Massachusetts General Hospital; Stanford University School of Medicine; The Feinstein Institute for Medical Research of the North Shore-LIJ Health System; The Ohio State University College of Medicine; University of Colorado School of Medicine; University of Rochester School of Medicine; and Wake Forest University School of Medicine.
Study subjects were randomized to receive either NLX-P101 treatment or sham surgery. Subjects in the NLX-P101 treatment arm received infusions of the genetic material directly into bilateral subthalamic nuclei (STN), a key brain region involved in motor function. Sham-assigned subjects underwent simulation of a bilateral neurosurgical procedure. At the end of each procedure, infusion catheters were removed at the bedside and nothing was left in the brain. All procedures were performed under local anesthesia. All but one of the trial participants were discharged from the hospital within 48 hours after the surgical procedure.
The primary outcome measure was the difference in UPDRS motor scores between NLX-P101 and sham-treated subjects, when the subjects were off PD medication. Other tests assessed motor fluctuations, constancy of medication effect and neuropsychological evaluations. A clinically-meaningful response was defined based on a 25 percent mean improvement from the initial Phase 1 NLX-P101 study (9 points). Patients in the sham surgery arm of the study who continue to meet all eligibility requirements will be provided an opportunity to receive NLX-P101 in a planned cross-over study. Treated subjects continue to be evaluated in an open-label, long-term follow-up study.
A Novel Approach to Gene Therapy
NLX-P101 aims to reset the overactive brain cells in the STN to inhibit electrical activity and return brain network activity to more normal levels. In PD, the loss of dopamine-secreting neurons alters chemical signaling pathways in the brain such that input to the STN is altered. The therapeutic approach with NLX-P101 modulates the activity of the STN (which is overactive in PD) by restoring GABA, a neurotransmitter important in STN function. GABA is made by a gene called glutamic acid decarboxylase (GAD). NLX-P101 uses an AAV vector (a disabled, non-pathogenic virus) to deliver the GAD gene into the STN. Increasing GAD activity causes more GABA to be synthesized, thus helping to lessen the STN over-activity.
About Parkinson's disease
Parkinson's disease is a progressive and debilitating neurodegenerative disorder that arises from the gradual deterioration of nerve cells in the brain. It affects the control of bodily movement and is characterized by four principal features: limb tremor, limb rigidity, bradykinesia (slowness of movement) and postural instability (trouble with balance).
Parkinson's disease is typically a disease that affects people over the age of 50. According to the National Parkinson Foundation, 1 million Americans currently have PD, and an estimated 50,000 to 60,000 new cases are diagnosed each year in the United States. Standard therapy for PD often involves use of levodopa, a drug which stimulates production of dopamine. Unfortunately, many patients develop complications from this and other medications, or they can fail to be effective. An alternative treatment is electrical deep brain stimulation, which requires the implantation of permanent medical devices in the brain.
Neurologix, Inc. (OTCBB:NRGX) is a clinical-stage biotechnology company dedicated to the discovery, development and commercialization of life-altering gene transfer therapies for serious disorders of the brain and central nervous system. Neurologix's therapeutic approach is built upon the groundbreaking research of its scientific founders and advisors, whose accomplishments have formed the foundation of gene therapy for neurological illnesses. The Company's current programs address such conditions as Parkinson's disease, epilepsy, depression and Huntington's disease, all of which are large markets not adequately served by current therapeutic options. For more information, please visit the Neurologix website at http://www.neurologix.net.