Kubota Vision Announced End of Phase 3 Clinical Trial of Emixustat in Patients with Stargardt Disease


SEATTLE–()–Kubota Vision Inc. (“Kubota Vision”), a clinical-stage ophthalmology company and wholly-owned subsidiary of Kubota Pharmaceutical Holdings Co., Ltd. (Tokyo 4596), announced today the completion of the phase 3 clinical trial investigating emixustat hydrochloride (“emixustat”) in patients with macular atrophy secondary to Stargardt disease.

The study was a multi-center, randomized, double-masked, and placebo-controlled phase 3 clinical study in which subjects were randomly assigned to emixustat 10 mg or placebo (2:1 ratio) once daily for 24 months. The target total number of subjects was 162; however, due to high interest in the study, a total of 194 subjects were enrolled in this study across 29 sites in 11 countries worldwide. The last patient has completed the study. The primary objective of this study is to determine if emixustat reduces the rate of macular atrophy progression, in comparison to placebo, in subjects with Stargardt disease. Secondary objectives include assessing changes in visual function parameters such as BCVA (best-corrected visual acuity) letter score and reading speed. The database of this study will be locked in the third quarter 2022.

Ryo Kubota, MD, PhD, Chairman, President and CEO of Kubota Vision Inc., stated, “Despite Stargardt being a rare disease, we were able to enroll more patients than originally planned and feel grateful that the patients trusted our drug with great expectation and continued taking the drug for two years during the pandemic. We would like to sincerely thank all of the participants and their families for their cooperation and are very pleased that the long-term, large-scale clinical trial has been successfully completed. We are also looking forward to receiving the results of the trial in the coming months.”

The FDA (U.S. Food and Drug Administration) and EMA (European Medicines Agency) granted orphan drug designation to emixustat for the treatment of Stargardt disease. (See January 5, 2017 press release titled “Acucela Receives Orphan Drug Designation from the FDA for the Treatment of Stargardt Disease” and June 9, 2019 press release titled “Acucela Receives Orphan Designation from the EMA for Emixustat for the Treatment of Stargardt Disease”)

About Stargardt Disease

Stargardt disease is a rare, genetically inherited disease that directly affects the retina of the eye, often resulting in the slow progression of vision loss in children. It may also be referred to as Stargardt macular dystrophy or juvenile macular degeneration and affects approximately 1 in 8,000 – 10,000 individuals worldwide.*1

The most common form of the disease is caused by a genetic mutation of the ABCA4 gene leading to the accumulation of toxic vitamin A byproducts (primarily A2E) in the retina, which results in the gradual deterioration of photoreceptors and vision. Symptoms of Stargardt disease typically appear during childhood or adolescence, but in some cases difficulty with eyesight and vision loss may not be identified until later in life.

Stargardt disease affects less than 150,000 patients in total in the U.S., Europe and Japan where it is recognized as an orphan disease. Currently, there are no known therapies that slow the advance of the disease, and it is recognized as a serious unmet medical need.

*1 Facts About Stargardt Disease, National Eye Institute. https://nei.nih.gov/health/stargardt/star_facts, accessed on 14 September 2018.

About Emixustat Hydrochloride

Emixustat modulates the visual cycle by inhibiting a critical enzyme of this pathway, retinal pigment epithelium protein 65 (RPE65). The visual cycle is the process by which vitamin A is recycled in the eye; vitamin A is crucial to the visual process. Slowing the visual cycle reduces the availability of vitamin A derivatives (11-cis- and all-trans-retinal) to form precursors of toxic A2E and related compounds. In addition, reducing the availability of 11-cis-retinal decreases retinal metabolic demands under dark conditions. Emixustat when delivered orally was found to be generally well tolerated in human clinical studies with delayed dark adaptation being the most common adverse event. Kubota Vision is exploring emixustat’s potential to stop or slow the progression of vision loss in patients diagnosed with Stargardt disease in an ongoing clinical study.

About Kubota Vision Inc.

Kubota Vision Inc. is a wholly owned subsidiary of Kubota Pharmaceutical Holdings Co., Ltd. (Tokyo 4596) committed to translating innovation into a diverse portfolio of drugs and devices to preserve and restore vision for millions of people worldwide. Kubota Pharmaceutical group’s development pipeline includes drug candidates for the treatment of diabetic retinopathy and Stargardt disease. The company is also developing a handheld OCT device for the monitoring of neovascular retinal diseases, to be used directly by patients, and wearable device for myopia control. https://www.kubotavision.com/; https://www.kubotaholdings.co.jp/en/

Cautionary Statements: https://www.kubotaholdings.co.jp/en/1/index.html

“Kubota Vision”, the Kubota Vision logo and “Kubota” are registered trademarks or trademarks of Kubota Vision Inc. or Kubota Pharmaceutical Holdings in various jurisdictions.



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