Alterity Therapeutics ((ASX: ATH, NASDAQ:ATHE) ("Alterity" or "the Company"), a biotechnology company dedicated to developing disease modifying treatments for neurodegenerative diseases, today announced that it has received the official meeting minutes from its End-of Phase-2 (EOP2) meeting for ATH434 in Multiple System Atrophy (MSA) from the U.S. Food and Drug Administration (FDA). The minutes confirm the key elements of the registrational Phase 3 program previously announced on 9 June 2026 and the path toward a potential New Drug Application (NDA) filing.

"The official meeting minutes confirm the alignment we reached with the FDA and provide a well-defined clinical development strategy for registration," said David Stamler, M.D., Chief Executive Officer. "The FDA’s willingness to accept a single pivotal trial supported by confirmatory evidence reflects a clear pathway for ATH434 in MSA. With the Phase 3 design elements confirmed, we are finalizing the protocol and remain on track to initiate Phase 3 trial activities by year-end 2026."

Dr. Daniel Claassen, MD, Chief Medical Advisor, commented: "The Phase 2 results for ATH434 were among the most encouraging I have seen in the field, and the alignment reached with the FDA on the Phase 3 trial design is an important next step in bringing a meaningful new treatment option to people living with this devastating disease."

The EOP2 minutes confirmed that the FDA agreed with the proposed Phase 3 trial design, including the study population, treatment regimen, and efficacy endpoints. Alignment was reached on the selection and analysis of the primary endpoint ‒ the 11-item UMSARS Part I1 rating scale, a functional measure of activities of daily living affected in MSA. Agreement was also reached on selection of key secondary endpoints, including the Swallowing Disturbance Questionnaire (SDQ), the Orthostatic Hypotension Symptom Assessment (OHSA), and the Clinical Global Impression of Severity (CGI-S). The Phase 3 study is expected to enroll approximately 200 patients who will be randomized in a 1:1 ratio and treated with ATH434 50 mg or matching placebo twice daily for 12 months.

The FDA further indicated that a single pivotal trial plus confirmatory evidence could provide the necessary data to support an approval of ATH434 for the treatment of MSA. Alterity expects that the data from its ATH434-201 Phase 2 clinical trial will provide the required confirmatory evidence. The FDA also indicated that the anticipated size of Alterity’s safety database at the conclusion for the Phase 3 was reasonable. A single pivotal trial provides an efficient route to completion of the clinical development program and potential filing of an NDA, both in time and resources required. The Company also plans to offer an open label extension to participants who complete the Phase 3 trial to continue their treatment and enhance the safety database for ATH434.