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דאימבון – תרופה שקיבלה אישור FDA להיבדק עבור מחלת הנטינגטון

מאת בתאריך 23 בדצמבר 2008 – 13:58אין תגובות

 

דיאמבון היא תרופה, שנמצאת בשימוש ברוסיה מעל לשני עשורים למטרות אחרות. בשנים האחרונות התגלה שיש לה פוטנציאל לשמש כתרופה למחלות ניווניות של המוח. התרופה נמצאת בניסוי של חצי שנה על 183 חולי אלצהימר כיעילה כנגד כל הסימפטומים של המחלה. במחקרים על עכברים היא נמצא כיעילה גם כנגד מחלת הנטינגטון. כעת חברת Medivation (בעלת הזיכיון לתרופה) קיבלה אישור מהFDA לערוך ניסוי של התרופה על חולי הנטינגטון. לא ברור כרגע מהם המנגנונים שבהם פעולת התרופה על תאי העצב.

 

 

http://www.hdlighthouse.org/research/trials/updates/1300clinicaltrial.php

 

HD Lighthouse Contributing Editor's Comment: Dimebon is a drug which has been used as an antihistamine in Russia for more than two decades. A few years ago, interest developed in the drug's potential to treat neurodegenerative disorders and Medivation, Inc. acquired the rights to the drug. The most recent research on this proprietary drug has not been published so the HDlighthouse is unable to independently comment on the drug's potential or discuss the mechanism(s) by which it is thought to work. Based on earlier work in Russia, it appears that this drug may regulate calcium homeostasis, prevent pathological opening of the mitochondrial permeability transition pores, and reduce the excitotoxicity of NMDA receptors.

 

Medivation Receives FDA Permission to Begin Dimebon Huntington's Disease Trial

Medivation, Inc. (AMEX:MDV) today announced that on September 27, 2006 it received permission from the FDA to begin the Company's U.S. Phase 1-2a clinical trial of Dimebon(TM) in patients with Huntington's disease. Medivation expects patient dosing to begin in early October.

 

David Hung, MD, President and Chief Executive Officer of Medivation, commented: "We are delighted that the FDA has accepted our Dimebon data package to allow us to begin treating patients with Huntington's disease in our clinical trial. Less than a year after first receiving animal data suggesting Dimebon's potential efficacy in treating Huntington's disease, we are ready to start clinical testing. Reaching this important milestone demonstrates our ability to advance the development of our technologies quickly and efficiently, which is a key component of our business strategy."

 

Dimebon(TM) has been shown to prevent the death of brain cells (neurons) in preclinical models of Alzheimer's disease and Huntington's disease, making it a novel potential treatment for many neurodegenerative diseases. Dimebon recently met all five efficacy endpoints in a six-month randomized, double-blinded, placebo-controlled trial of 183 patients with mild to moderate Alzheimer's disease. Patients in the trial were tested for a full spectrum of problems typically caused by Alzheimer's disease, including memory loss, behavioral disturbances, and inability to perform everyday activities such as bathing and dressing. After six months of treatment, patients on Dimebon got significantly better on all of these tests. Dimebon patients also scored significantly better on all of these tests than did placebo patients. Dimebon, which has a 20-year record of human use, also was very well tolerated in this study. Medivation and its advisors designed this study to match closely the design of pivotal registration studies previously accepted by the FDA to approve currently marketed Alzheimer's disease drugs, including duration of treatment, clinical endpoints and patient inclusion/exclusion criteria.

 

Medivation is conducting the Huntington's disease study in collaboration with the Huntington Study Group (HSG), a network of more than 250 experienced clinical trial investigators, coordinators and consultants from more than 60 academic and research institutions throughout the United States, Canada, Europe and Australia. The study will be performed at approximately 12 HSG sites in the United States, and the principal investigator is Karl Kieburtz, MD, MPH, Professor of Neurology at the University of Rochester and the Director of the HSG Clinical Trials Coordination Center.

 

"My colleagues at the HSG and I are enthusiastic about participating in this study to evaluate the safety, tolerability and preliminary efficacy of Dimebon as a treatment for Huntington's disease," said Dr. Kieburtz. "Prior research suggests that Dimebon may help address the debilitating memory, cognition and behavioral deficits experienced by Huntington's disease patients, for whom no approved therapies presently exist."

 

Lynn Seely, MD, Medivation's Chief Medical Officer, added: "We are particularly pleased to be conducting this study in collaboration with the HSG. Since its formation in 1993, the HSG has been a leader in clinical research to address the devastation experienced by Huntington's disease patients and their families. The depth and breadth of experience the HSG brings to this project is an enormous advantage to the Huntington's disease patient community as well as to Medivation. We are honored that they have chosen to work with us on this important clinical trial."

 

The Huntington's disease clinical study has two parts — the first part is to assess the safety of various doses of Dimebon, and the second part is a randomized, double-blinded, placebo-controlled phase to assess the preliminary efficacy of Dimebon as a treatment for Huntington's disease. Medivation will submit additional animal studies to the FDA before beginning the second part of the clinical trial, and expects to report clinical trial results in the second half of 2007.

 

About Huntington's Disease

Huntington's disease is a fatal neurodegenerative disorder characterized by involuntary movements, loss of cognitive function and memory, and a wide spectrum of behavioral disorders. The disease is caused by a specific genetic mutation, which results in degeneration and death of cells in many different regions of the brain. Anyone who carries at least one copy of the Huntington's disease mutation and lives long enough will likely develop the disease. Death usually occurs between 10 and 20 years after the onset of symptoms, making Huntington's disease a protracted and devastating illness. In the U.S. alone, approximately 30,000 patients currently suffer from Huntington's disease, and an estimated 200,000 additional patients are genetically at risk for developing it. There are no FDA-approved therapies for Huntington's disease, and no cure.

 

About Medivation

Medivation, Inc. acquires promising pharmaceutical and medical device technologies in the late preclinical development phase, and develops those technologies quickly and cost-effectively through human first proof-of-efficacy studies (generally the end of Phase 2 clinical trials). Depending on the indication, Medivation will either conduct late stage clinical studies internally, or seek to partner or sell successful programs to larger pharmaceutical, biotechnology or medical device companies. The Company intends to build and maintain a portfolio of four to six development programs at all times.

 

Medivation's current portfolio consists of small molecule drugs in development to treat three large, unmet medical needs — Alzheimer's disease, Huntington's disease and hormone-refractory prostate cancer, the last two of which are likely Orphan Drug indications. Key upcoming product development milestones include reporting results from a twelve-month extension study of Dimebon in Alzheimer's disease patients (Q2 2007), from a Phase 1-2a study of Dimebon in Huntington's disease patients (2H 2007), and from a clinical study of the lead MDV300 series compound in hormone-refractory prostate cancer patients (2H 2007). Further information about Medivation can be found on its website (www.medivation.com).

 

Earlier Press Release: Dimebon Meets All Five Efficacy Endpoints In Phase 2 Alzheimer's Disease Study Medivation, Inc. (AMEX:MDV – News) today announced that its proprietary drug Dimebon(TM) met all five efficacy endpoints in a six-month randomized, double-blinded, placebo-controlled Phase 2 clinical study of 183 patients with mild to moderate Alzheimer's disease conducted at 11 sites in Russia. Compared with patients receiving placebo, patients treated with Dimebon demonstrated highly statistically significant improvement on the study's primary efficacy endpoint, the Alzheimer's Disease Assessment Scale-cognition (ADAS-cog; 4.0 point improvement in the mean change from baseline to week 26 as compared to placebo; p less than 0.0001), and on the key secondary efficacy endpoint, the Clinical Global Impression of Change (CGIC; 0.6 point improvement in the mean change from baseline to week 26 as compared to placebo; p less than 0.0001). Dimebon-treated patients also achieved statistically significant improvement (p less than 0.01) compared with placebo patients on all three of the other secondary efficacy endpoints – the Activities of Daily Living, the Neuropsychiatric Inventory and the Mini Mental State Examination

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