Oxurion Discloses Topline Data from KALAHARI Phase 2, Part B Trial of Novel PKal Inhibitor THR-149 in Diabetic Macular Edema
Regulated information – Inside information
Despite Prior Positive Data, THR-149 Did Not Demonstrate Improvement in Vision
Oxurion’s Board has Decided to Take Necessary Steps to File for Bankruptcy
Leuven, BELGIUM, Boston, MA, US – November 20, 2023 – 7:00 am CET – Oxurion NV (Euronext Brussels: OXUR) a biopharmaceutical company announced today that topline data in its KALAHARI Phase 2, Part B clinical trial for diabetic macular edema (DME) (KALAHARI trial) did not demonstrate that its novel PKal Inhibitor, THR-149, improved vision as much as the comparator, the anti-VEGF therapy aflibercept, at Month 3 (the primary endpoint). The mean change in best corrected visual acuity (BCVA) from baseline at Month 3 was -0.2 letters for the THR-149 arm and +3.5 letters for the aflibercept arm. The results confirmed that THR-149 was safe and well tolerated. The KALAHARI trial is the only ongoing trial sponsored by Oxurion.
In light of these results and the Company’s low cash position, the Company has therefore decided to take the necessary steps to file for bankruptcy.
Oxurion’s investigators over-enrolled the trial with a total of 112 patients, for whom the current standard of care is suboptimal in treating their DME, reflecting the strong interest of both investigators and patients.
The KALAHARI trial evaluated Oxurion’s novel plasma kallikrein (PKal) inhibitor THR-149 as a potential treatment for DME patients who respond suboptimally to anti-VEGF therapy. The continuation of the trial followed the recommendation from an Independent Data Monitoring Committee (IDMC) in December 2022 that it would not be futile for the KALAHARI trial to continue based on the outcome of a pre-specified futility analysis that included an evaluation of interim efficacy and safety data from 31 patients at Month 3 and followed encouraging data from the Part A dose-selection part of the KALAHARI trial.
Said Tom Graney, CEO, “We are deeply disappointed that the topline data from the KALAHARI trial did not show improvement in vision from THR-149. While we had hoped for a different result for patients, we greatly appreciate the engagement of both the patients and the clinical investigators for their participation in Phase 2 KALAHARI trial. The Board of Directors has made the difficult decision to take the necessary steps to file for bankruptcy. I would personally like to thank the incredible team at Oxurion for designing and executing a trial that yielded clearly interpretable results. So, while the outcome is not what we had hoped for patients and the company, the trial provides important learnings for the field. I want to encourage the community to continue to invest in finding better treatments options for this large, underserved patient population.”
Diabetic Macular Edema (DME)
Approximately 22 million people worldwide have DME currently, with prevalence increasing due to the growing global diabetic epidemic. DME is the leading cause of vision loss in working-age people, and the market for treatments is currently estimated at +$5 billion.
People who suffer from DME have leaking vessels in the back of the eye, leading to a thickening of the retina that causes vision problems such as blurriness in the center of vision, the appearance of dark spots or patches in the field of vision, and colors to look dull. These symptoms may affect the ability to read, write, drive, and recognize faces – presenting a significant patient and caregiver burden.
THR-149 is a bicyclic peptide that selectively inhibits human plasma kallikrein (PKal) with an inhibition constant of 0.22 nM. Through the inhibition of the kallikrein-kinin system (KKS), THR-149 prevents the induction of retinal vascular permeability, neurodegeneration, and inflammation. THR-149 is currently being evaluated in the KALAHARI Phase 2, Part B clinical trial as a potential treatment for patients who respond suboptimally to anti-VEGF the standard of care for treatment of DME.
KALAHARI Phase 2, Part B
The Phase 2 KALAHARI trial is a two-part, randomized, prospective, multi-center trial assessing multiple (3) injections of THR-149 in DME patients. Part B is double-masked and actively controlled, with the high dose of THR-149 having been selected from Part A of the trial. Part B of the trial enrolled 112 patients who have previously shown a suboptimal response to anti-VEGF therapy, and where THR-149 is being evaluated against aflibercept, the current standard of care, as the active comparator.
KALAHARI Phase 2, Part A
Part A of the KALAHARI trial demonstrated that all dose levels of THR-149 had a favorable safety profile. All adverse events in the study eye were mild to moderate in intensity and no severe ocular adverse events were reported and no inflammation was observed. High-level data from Part A of the KALAHARI trial was first presented in October 2021, which demonstrated that the eight patients who received the highest dose of THR-149 achieved a mean BCVA gain of 6.1 letters at Month 3, the primary endpoint.
A post-hoc analysis was performed by the masked central reading center in February 2022 based on an OCT (Optical Coherence Tomography) biomarker assessment. The analysis identified two subjects with abnormalities at baseline, which could impact responsiveness to any medical treatment. Excluding these two subjects resulted in an improvement in mean BCVA of 9.3 letters at Month 3, which was sustained until Month 6, the end of the trial, and four months after the last THR-149 injection. The Month 6 data also demonstrated THR-149’s attractive safety profile and its ability to stabilize the Central Subfield Thickness (CST). The learnings from the Part A data were incorporated into Part B through an amended trial design excluding patients that would not respond to any treatment. More information can be found here: NCT04527107
Oxurion (Euronext Brussels: OXUR) is a biopharmaceutical company developing next-generation standard of care ophthalmic therapies, which are designed to improve and better preserve vision in patients with retinal disorders including diabetic macular edema (DME), the leading cause of vision loss in working-age people, as well as other conditions. Oxurion intends to play an important role in the treatment of retinal disorders, including the successful development of THR-149, its novel therapeutic for the treatment of DME. THR-149 is a potent plasma kallikrein inhibitor being developed as a potential new standard of care for the up to 50% of DME patients showing suboptimal response to anti-VEGF therapy. Oxurion is headquartered in Leuven, Belgium, with corporate operations in Boston, MA. More information is available at www.oxurion.com.
Important information about forward-looking statements
Certain statements in this press release may be considered “forward-looking”. Such forward-looking statements are based on current expectations, and, accordingly, entail and are influenced by various risks and uncertainties. The Company therefore cannot provide any assurance that such forward-looking statements will materialize and does not assume any obligation to update or revise any forward-looking statement, whether as a result of new information, future events, or any other reason. Additional information concerning risks and uncertainties affecting the business and other factors that could cause actual results to differ materially from any forward-looking statement is contained in the Company’s Annual Report. This press release does not constitute an offer or invitation for the sale or purchase of securities or assets of Oxurion in any jurisdiction. No securities of Oxurion may be offered or sold within the United States without registration under the U.S. Securities Act of 1933, as amended, or in compliance with an exemption therefrom, and in accordance with any applicable U.S. state securities laws.
For further information please contact:
Chief Executive Officer
Tel: +32 16 75 13 10
Chief Business Officer
Tel: +32 16 75 13 10
Mary T. Conway
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