Neurologix Presents One-Year Follow-Up Data From Phase 2 Study of NLX-P101 in Parkinson's Disease at International Neuromodulation Society 10th World Congress
- Category: DNA RNA and Cells
- Published on Thursday, 26 May 2011 03:00
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One-year follow-up data confirm NLX-P101 provides sustained, positive long-term efficacy in Parkinson's disease patients
FORT LEE, NJ, USA | May 26, 2011 | Neurologix, Inc. (OTCBB:NRGX.ob - News) announced the presentation today of efficacy results through one year of follow-up in patients treated as part of the Company's successful Phase 2 clinical trial for its novel, investigational gene therapy NLX-P101 for the treatment of Parkinson's disease (PD). Improvements in the Unified Parkinson's Disease Rating Scale (UPDRS) at 12 months for the randomized, double-blind, sham surgery-controlled trial of 45 subjects with advanced PD confirmed that patients treated with NLX-P101 experienced sustained, positive, long-term benefits. The one-year follow-up data were presented by one of the scientific co-founders of Neurologix, Michael G. Kaplitt, M.D., Ph.D., at the International Neuromodulation Society's (INS) 10th World Congress in London.
In the one-year follow-up analysis, patients treated with NLX-P101 who achieved previously defined moderate-to-large clinically-meaningful symptom improvements (> / = 9 points in off-medication UPDRS motor score), increased from 50 percent at six months to 63 percent at one year. This major subgroup of NLX-P101-treated patients experienced a mean 37 percent improvement in their symptoms after one-year, with an average improvement of 14 points in off-medication UPDRS motor score. Among all patients included in the NLX-P101 treatment group, the clinical improvements demonstrated at six months were maintained, with an average 8.2 point improvement in off-medication UPDRS motor score at 12 months compared to an 8.1 point improvement at six months. No serious adverse events (SAEs) related to the gene therapy or surgical procedure were reported in either the blinded six-month study period or the completed 12 month study phase.
"These results demonstrate that treatment with NLX-P101 improved the primary motor symptoms of Parkinson's disease in patients overall, with a majority obtaining a highly clinically meaningful improvement," said Neurologix scientific co-founder Matthew J. During, M.D., D.Sc., 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. "Further, the positive, durable responses we saw one-year after treatment with NLX-P101 in the Phase 2 study are consistent with the long-term efficacy demonstrated in our Phase 1 trial, the first ever to demonstrate the viability of gene therapy for the treatment of Parkinson's disease. The results from the first two phases of NLX-P101 clinical research give us great confidence in the potential of NLX-P101 as we move forward with our plans for 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 (4.7 points) improvement 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).
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.
"The results presented today at the INS World Congress add to a growing body of clinical evidence demonstrating that our novel gene therapy approach may provide significant clinical benefits to Parkinson's disease patients," During added. "In the treatment arm of the Phase 2 study, improved motor control was seen at one month, continued virtually unchanged throughout the six-month blinded study period and persisted through 12 months of follow-up. This suggests that the treatment effect from NLX-P101 is meaningful and durable over the long-term."
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.ob - News) 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.