FDA approves Luxturna gene therapy treatment
Posted on: Wednesday, December 20th, 2017
The U.S. Food and Drug Administration has approved Luxturna (voretigene neparvovec-rzyl), a new gene therapy, to treat children and adult patients with an inherited form of vision loss that may result in blindness. Luxturna is the first directly administered gene therapy approved in the U.S. that targets a disease caused by mutations in a specific gene.
“Today’s approval marks another first in the field of gene therapy – both in how the therapy works and in expanding the use of gene therapy beyond the treatment of cancer to the treatment of vision loss – and this milestone reinforces the potential of this breakthrough approach in treating a wide-range of challenging diseases. The culmination of decades of research has resulted in three gene therapy approvals this year for patients with serious and rare diseases. I believe gene therapy will become a mainstay in treating, and maybe curing, many of our most devastating and intractable illnesses,” said FDA Commissioner Scott Gottlieb, M.D. “We’re at a turning point when it comes to this novel form of therapy and at the FDA, we’re focused on establishing the right policy framework to capitalize on this scientific opening. Next year, we’ll begin issuing a suite of disease-specific guidance documents on the development of specific gene therapy products to lay out modern and more efficient parameters – including new clinical measures – for the evaluation and review of gene therapy for different high-priority diseases where the platform is being targeted.”
Luxturna is approved for the treatment of patients with confirmed biallelic RPE65 mutation-associated retinal dystrophy that leads to vision loss and may cause complete blindness in certain patients.
Hereditary retinal dystrophies are a broad group of genetic retinal disorders that are associated with progressive visual dysfunction and are caused by mutations in any one of more than 220 different genes. Biallelic RPE65 mutation-associated retinal dystrophy affects approximately 1,000 to 2,000 patients in the U.S. Biallelic mutation carriers have a mutation (not necessarily the same mutation) in both copies of a particular gene (a paternal and a maternal mutation). The RPE65 gene provides instructions for making an enzyme (a protein that facilitates chemical reactions) that is essential for normal vision. Mutations in the RPE65 gene lead to reduced or absent levels of RPE65 activity, blocking the visual cycle and resulting in impaired vision. Individuals with biallelic RPE65 mutation-associated retinal dystrophy experience progressive deterioration of vision over time. This loss of vision, often during childhood or adolescence, ultimately progresses to complete blindness.
Luxturna works by delivering a normal copy of the RPE65 gene directly to retinal cells. These retinal cells then produce the normal protein that converts light to an electrical signal in the retina to restore patient’s vision loss. Luxturna uses a naturally occurring adeno-associated virus, which has been modified using recombinant DNA techniques, as a vehicle to deliver the normal human RPE65 gene to the retinal cells to restore vision.
“The approval of Luxturna further opens the door to the potential of gene therapies,” said Peter Marks, M.D., Ph.D., director of the FDA’s Center for Biologics Evaluation and Research (CBER). “Patients with biallelic RPE65 mutation-associated retinal dystrophy now have a chance for improved vision, where little hope previously existed.”
Luxturna should be given only to patients who have viable retinal cells as determined by the treating physician(s). Treatment with Luxturna must be done separately in each eye on separate days, with at least six days between surgical procedures. It is administered via subretinal injection by a surgeon experienced in performing intraocular surgery. Patients should be treated with a short course of oral prednisone to limit the potential immune reaction to Luxturna.
The safety and efficacy of Luxturna were established in a clinical development program with a total of 41 patients between the ages of 4 and 44 years. All participants had confirmed biallelic RPE65 mutations. The primary evidence of efficacy of Luxturna was based on a Phase 3 study with 31 participants by measuring the change from baseline to one year in a subject’s ability to navigate an obstacle course at various light levels. The group of patients that received Luxturna demonstrated significant improvements in their ability to complete the obstacle course at low light levels as compared to the control group.
The most common adverse reactions from treatment with Luxturna included eye redness (conjunctival hyperemia), cataract, increased intraocular pressure and retinal tear.
The FDA granted this application Priority Review and Breakthrough Therapy designations. Luxturna also received Orphan Drug designation, which provides incentives to assist and encourage the development of drugs for rare diseases.
The sponsor is receiving a Rare Pediatric Disease Priority Review Voucher under a program intended to encourage development of new drugs and biologics for the prevention and treatment of rare pediatric diseases. A voucher can be redeemed by a sponsor at a later date to receive Priority Review of a subsequent marketing application for a different product. This is the 13th rare paediatric disease priority review voucher issued by the FDA since the program began.
To further evaluate the long-term safety, the manufacturer plans to conduct a post-marketing observational study involving patients treated with Luxturna.
“This truly is a milestone for gene therapy and sight loss research,” commented Tina Houlihan, Chief Executive at RP Fighting Blindness. “We are confident that over the next few years we will see more gene therapy treatments reaching clinical trial stage, and more treatments approved for patient use. We are entering an exciting new era of medical research; one where we are seeing the fruits of many years of painstaking foundation work paying off. Obviously there is still much work to be done and the development of more novel gene therapy treatments needs to be undertaken, but the inherited progressive sight loss community as a whole should be encouraged by this announcement. Our time is coming – genetic therapies have never had so much exposure in the public eye and this can only help us secure more funding and undertake more research than ever before. I’m so excited for the coming years and seeing even more leaps in our understanding of this group of conditions.”
“Drug treatment pricing is a complex and controversial topic – as an organisation which funds scientific research, we do understand the costs associated with undertaking quality research, and the investments required. As a patient organisation however, our first priority is always our community – we’re keen to understand how the pricing model of Luxturna will impact British patients and the role of the NHS in this. As gene therapy research progresses, we’re certain we’ll see more treatments like Luxturna, for sight loss and a whole range of genetic conditions. We’re at an exciting early stage and finally seeing the fruits of many years of foundation work undertaken by both charitable medical research funders and the commercial sector. We should not forget what a huge step forward this treatment is for our community – it’s impossible to put a value on sight.”