Gain Therapeutics Doses First Participant in Phase 1b Clinical Trial of GT-02287 in Parkinson's Disease

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Interim Analysis Expected End of 2Q 2025
BETHESDA, Md. - March 14, 2025 - Gain Therapeutics, Inc. (Nasdaq: GANX) ("Gain", or the "Company"), a clinical-stage biotechnology company leading the discovery and development of the next generation of allosteric small molecule therapies, today announced the dosing of the first participant with Parkinson's disease (PD) in its Phase 1b clinical trial of GT-02287, the Company's lead allosteric small molecule in development for the treatment of PD with or without a GBA1 mutation.

"Initiation of dosing in our Phase 1b clinical trial represents an important step in the clinical development of GT-02287 and in Gain's mission to deliver a disease-modifying therapy to people with Parkinson's disease. We look forward to continued enrollment and anticipate an interim analysis from the towards the end of 2Q 2025," said Gene Mack, President and CEO of Gain Therapeutics.

The Phase 1b open-label, multi-center trial is designed to evaluate the safety and tolerability of GT-02287 in people with GBA1-PD and idiopathic PD. Secondary endpoints include pharmacokinetics, GCase modulation, levels of GCase substrates, and other biomarkers in plasma and cerebrospinal fluid. The trial will enroll up to 20 participants who will receive GT-02287 daily for three months. Interim data from the Phase 1b trial are anticipated at the end of 2Q 2025.

The Phase 1b trial follows Gain's successful Phase 1 study in healthy volunteers completed during Q3 2024, in which GT-02287 demonstrated a favorable safety and tolerability profile as well as plasma and CNS exposures in the projected therapeutic range. Importantly, the Phase 1 study also showed significant target engagement of GT-02287 demonstrated by a statistically significant increase in glucocerebrosidase (GCase) activity that was >50%.

For more information on the Phase 1b clinical trial, visit: https://clinicaltrials.gov/study/NCT06732180

About GT-02287

Gain Therapeutics' lead drug candidate, GT-02287, is in clinical development for the treatment of Parkinson's disease (PD) with or without a GBA1 mutation. The orally administered, brain-penetrant small molecule is an allosteric enzyme modulator that restores the function of the lysosomal enzyme glucocerebrosidase (GCase) which becomes misfolded and impaired due to mutations in the GBA1 gene, the most common genetic abnormality associated with PD, or other age-related stress factors. In preclinical models of PD, GT-02287 restored GCase enzymatic function, reduced aggregated -synuclein, neuroinflammation and neuronal death, and improved motor function and cognitive performance. Additionally, GT-02287 significantly reduced plasma neurofilament light chain (NfL) levels, an emerging biomarker of neurodegeneration.

Compelling preclinical data in models of both GBA1-PD and idiopathic PD, demonstrating a disease-modifying effect after administration of GT-02287, suggest that GT-02287 may have the potential to slow or stop the progression of Parkinson's disease.

Gain's lead program in Parkinson's disease has been awarded funding support early in its development from The Michael J. Fox Foundation for Parkinson's Research (MJFF) and The Silverstein Foundation for Parkinson's with GBA, as well as from the Eurostars-2 joint program with co-funding from the European Union Horizon 2020 research and Innosuisse - Swiss Innovation Agency.

About Gain Therapeutics, Inc.

Gain Therapeutics, Inc. is a clinical-stage biotechnology company leading the discovery and development of next-generation allosteric therapies. Gain's lead drug candidate, GT-02287 is currently being evaluated for the treatment of Parkinson's disease with or without a GBA1 mutation. Results from a Phase 1 study of GT-02287 in healthy volunteers demonstrated favorable safety and tolerability, plasma exposure in the projected therapeutic range, CNS exposure, and target engagement and modulation of GCase enzyme.

Gain's unique approach enables the discovery of novel, allosteric small molecule modulators that can restore or disrupt protein function. Deploying its highly advanced Magellan Trademark platform, Gain is accelerating drug discovery and unlocking novel disease-modifying treatments for untreatable or difficult-to-treat disorders including neurodegenerative diseases, rare genetic disorders and oncology.

Forward-Looking Statements

This release contains "forward-looking statements" made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These statements are typically preceded by words such as "believes," "expects," "anticipates," "intends," "will," "may," "should," or similar expressions. These forward-looking statements reflect management's current knowledge, assumptions, judgment and expectations regarding future performance or events. Although management believes that the expectations reflected in such statements are reasonable, they give no assurance that such expectations will prove to be correct or that those goals will be achieved, and you should be aware that actual results could differ materially from those contained in the forward-looking statements. Forward-looking statements are subject to a number of risks and uncertainties, including, but not limited to, statements regarding: the development of the Company's current or future product candidates including GT-02287; expectations regarding the timing of results from a Phase 1b clinical study for GT-02287; expectations regarding the timing of patient enrollment for a Phase 1b clinical study for GT-02287; and the potential therapeutic and clinical benefits of the Company's product candidates. For a further description of the risks and uncertainties that could cause actual results to differ from those expressed in these forward-looking statements, as well as risks relating to the Company's business in general, please refer to the Company's Form 10-K for the year ended December 31, 2023 and Form 10-Q for the quarter ended September 30, 2024. All forward-looking statements are expressly qualified in their entirety by this cautionary notice. You are cautioned not to place undue reliance on any forward-looking statements, which speak only as of the date of this release. We have no obligation, and expressly disclaim any obligation, to update, revise or correct any of the forward-looking statements, whether as a result of new information, future events or otherwise.

Investor Contacts:

Apaar Jammu and Chuck Padala

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