ATSN-101

Marks second FDA designation for ATSN-201, which previously received Rare Pediatric Disease designationDURHAM, N.C., Sept. 17, 2024 (GLOBE NEWSWIRE) -- Atsena Therapeutics, a clinical-stage gene therapy company focused on bringing the life-changing power of genetic medicine to reverse or prevent blindness, today announced that the U.S. Food and Drug Administration (FDA) has granted Orphan Drug Designation for ATSN-201 for the treatment of X-linked retinoschisis (XLRS). ATSN-201, a best-in-class gene therapy product candidate, leverages AAV.SPR, the company’s novel spreading capsid, to achieve therapeutic levels of gene expression in photoreceptors of the central retina while avoiding the surgical risks of foveal detachment. “We are honored to receive the FDA’s Orphan Drug Designation for ATSN-201, which was also recently granted Rare Pediatric Disease designation. These designations mark a significant inflection point for the potential of this ocular gene therapy in an inherited retinal disease that currently has no available treatments,” said Patrick Ritschel, Chief Executive Officer of Atsena Therapeutics. “The Atsena team is passionate and committed to our ongoing work on the XLRS program. We look forward to bringing hope to patients affected by this rare disease and are confident these designations will expedite our path forward.” The FDA grants Orphan Drug Designation to drugs and biologics that are intended for safe and effective treatment, diagnosis or prevention of rare diseases or disorders that affect fewer than 200,000 people in the U.S. Orphan Drug Designation provides certain incentives, such as tax credits toward the cost of clinical trials upon approval and prescription drug user fee waivers. If a product receives Orphan Drug Status from the FDA, that product is entitled to seven years of market exclusivity for the disease in which it has Orphan Drug designation, which is independent from intellectual property protection. Currently, there are no approved treatments for XLRS, which is typically diagnosed in early childhood and affects approximately 30,000 males in the U.S. and EU. The safety and tolerability of ATSN-201 is currently being evaluated in the LIGHTHOUSE study, a Phase I/II, open-label, dose-escalation and dose-expansion clinical trial in male patients ages six and older with a clinical diagnosis of XLRS caused by mutations in the RS1 gene. Enrollment for this study is ongoing. For more information, visit ClinicalTrials.gov (Identifier: NCT05878860). About X-linked Retinoschisis (XLRS)XLRS is a monogenic X-linked disease caused by mutations in the RS1 gene which encodes retinoschisin, a protein secreted primarily by photoreceptors. RS1 is localized to the extracellular surface of rods, cones, and bipolar cells. XLRS is characterized by schisis, or abnormal splitting of retinal layers, which causes impaired visual acuity that is not correctable with glasses and leads to progressive vision loss and ultimately blindness. XLRS primarily affects males and is typically diagnosed in early childhood. Approximately 30,000 males in the U.S. and EU have XLRS, for which there are currently no approved treatments. About AAV.SPRAAV.SPR, one of Atsena’s novel capsids, spreads laterally beyond the subretinal injection site to enable safe and efficient transduction of the central retina (where schisis cavities predominate in XLRS patient retinas) when injected into areas outside the macula. A preclinical study in non-human primates demonstrated that AAV.SPR promotes transgene expression well beyond subretinal injection bleb margins. This is in stark contrast to benchmark AAV vectors, which remain confined to the original bleb margins. At clinically relevant doses, AAV.SPR efficiently transduces foveal cones without the need for surgical detachment and does not cause inflammation. For more information about the preclinical study and how AAV.SPR works, visit https://atsenatx.com/our-approach/laterally-spreading-aav/. About Atsena TherapeuticsAtsena Therapeutics is a clinical-stage gene therapy company developing best-in-class treatments for the reversal or prevention of blindness from inherited retinal diseases. The company’s lead program is evaluating ATSN-201 in an ongoing Phase I/II clinical trial for X-linked retinoschisis (XLRS), a progressive genetic condition affecting boys and men that is typically diagnosed in childhood. Another ongoing Phase I/II clinical trial is evaluating ATSN-101 for Leber congenital amaurosis type 1 (LCA1), one of the most common causes of blindness in children. Atsena’s pipeline is powered by novel adeno-associated virus (AAV) technology tailored to overcome the hurdles presented by inherited retinal diseases. Founded by pioneers in ocular gene therapy, Atsena is led by an experienced team dedicated to addressing the needs of patients with vision loss. For more information, please visit https://atsenatx.com/. Media Contact:Tony Plohoros6 Degrees(908) 591-2839tplohoros@6degreespr.com Business Contact:info@atsenatx.com

FRIDAY, Sept. 6, 2024 -- Gene therapy may restore vision to children and adults robbed of their sight by a rare inherited condition called Leber congenital amaurosis, researchers report. The illness is caused by mutations in the GUCY2D gene, which is critical to producing proteins that enable vision. People with this form of Leber congenital amaurosis (LCA1) typically lose their vision in early childhood. Just under 100,000 people are thought to be affected worldwide. However, a team of researchers at the University of Pennsylvania say that a new gene therapy injected under the retinas of children and adults with LCA1 improved vision by 100 to 10,000 times. “Even though we previously predicted a large vision improvement potential in LCA1, we did not know how receptive patients’ [eye] photoreceptors would be to treatment after decades of blindness,” noted study co-lead author Artur Cideciyan , a research professor of ophthalmology at the university. “It is very satisfying to see a successful multi-center trial that shows gene therapy can be dramatically efficacious.” The findings were published Sept. 5 in The Lancet journal. A total of 15 LCA1 patients -- 12 adults and three children -- participated in the new trial. All had vision that was equal to or below 20/80, meaning that objects a normally sighted person could see at 80 feet could only be clear at 20 feet away for a person with LCA1. Glasses were of little help, because glasses only address the eye's focusing ability, not any underlying medical cause driving vision loss. The new gene therapy is called ATSN-101 and was developed by Atsena Therapeutics, which funded the new trial. This was a small phase 2 trial, meant to gauge a treatment's safety and explore differences when various dosages are used. The injected therapy was tried at three different dosages. Three adult patients each received low, medium and high doses of ATSN-101. Once the treatments' safety was assessed, six participants (including the three children) received high-dose ATSN-101. According to the research team, vision began to improve quickly in all patients, usually within a month of treatment. Improvements have lasted for at least a year. Patients' vision was tested in various ways, including their ability to move through a sometimes dimly-lit pathway, eye charts and "light flash" tests conducted in a dark environment. Two of nine patients who got the high-dose treatment had a 10,000-fold improvement in their sight, Cideciyan's group reported. “That 10,000-fold improvement is the same as a patient being able to see their surroundings on a moonlit night outdoors as opposed to requiring bright indoor lighting before treatment,” said Cideciyan, who also co-directs the Center for Hereditary Retinal Degenerations at UPenn. “One patient reported for the first time being able to navigate at midnight outdoors only with the light of a bonfire.” Side effects could happen, and were usually related to the surgery used to implant the gene therapy. These included tiny hemorrhages within the eye that later healed, or transient inflammation of the eye, treated with steroids. The patients' vision is being tracked going forward, the researchers said, and a bigger, randomized trial is being planned as a requirement of any U.S. Food and Drug Administration approval of the new therapy. The new work follows on the team's prior success using gene therapy to reverse another form of Leber congenital amaurosis, this time connected to a mutation in the CEP290 gene. “The treatment success in our most recent clinical trials together with our earlier experience brings hope for a viable treatment for about 20 percent of infantile blindness caused by inherited retinal degenerations,” study co-author Dr. Tomas Aleman said in a UPenn news release. He is research professor in ophthalmology and co-director of the Center for Hereditary Retinal Degenerations. “The focus now is on perfecting the treatments and treating earlier manifestations of these conditions once safety is confirmed," he said. "We hope similar approaches will lead to equally positive outcomes in other forms of congenital retinal blindness.” Whatever your topic of interest, subscribe to our newsletters to get the best of Drugs.com in your inbox.