Sensorion Announces Completion of Enrollment of The First Cohort of The Audiogene Phase 1/2 Gene Therapy Clinical Trial

Regulatory News:

Sensorion (FR0012596468 – ALSEN) a pioneering clinical-stage biotechnology company which specializes in the development of novel therapies to restore, treat and prevent within the field of hearing loss disorders today announces the completion of enrollment of patients in the first cohort of the Audiogene Phase 1/2 gene therapy clinical trial.

Recruitment of the first cohort (three patients) was completed as planned, with the third patient receiving an injection of SENS-501 gene therapy product in December 2024. For all patients treated in the first cohort, the surgical procedure was well tolerated: the intra-cochlear administration of the gene therapy product was uneventful, and no serious adverse events were reported. Audiogene is the first gene therapy clinical trial addressing a unique homogeneous population of infants and toddlers (aged 6 to 31 months at the time of the injection) naïve of cochlear implants. Audiogene’s clinical trial design has been intended to assess SENS-501 gene therapy product capacity not only to restore hearing but also to allow the infants and toddlers to acquire and develop normal speech.

Nawal Ouzren, Chief Executive Officer of Sensorion, declared: “I am very pleased with the progress Sensorion has realised in its Phase 1/2 gene therapy clinical trial. The injection of the third and last patient of the first cohort, less than a year after the clinical trial application authorization, is a major accomplishment for Sensorion. The surgery of the infant was uneventful, and no serious adverse events were reported. I am very excited about the KOL event we plan in early 2025, with leading field experts, to present and comment on a fuller set of data measurements. I am looking forward to advancing SENS-501 and assessing its ability to restore hearing and enable normal speech acquisition and development in the treated toddlers and infants.”

About the Audiogene Trial Audiogene aims to evaluate the safety, tolerability and efficacy of intra-cochlear injection of SENS-501 for the treatment of OTOF gene-mediated hearing loss in infants and toddlers aged 6 to 31 months at the time of gene therapy treatment. By targeting the first years of life, when brain plasticity is optimal, the chances of these young children with pre-linguistic hearing loss acquiring normal speech and language are maximized. The study comprises two cohorts of two doses followed by an expansion cohort at the selected dose. While safety will be the primary endpoint of the first part of the dose escalation study, auditory brainstem response (ABR) will be the primary efficacy endpoint of the second part of the expansion. Audiogene will also evaluate the clinical safety, performance and ease-of-use of the delivery system developed by Sensorion.

About SENS-501 SENS-501 (OTOF-GT) is an innovative gene therapy program developed to treat a specific form of congenital deafness linked to mutations in the OTOF (otoferlin) gene. This gene plays a key role in the transmission of auditory signals between the hair cells of the inner ear and the auditory nerve. When this gene is defective, affected individuals are born with severe to profound hearing loss. The aim of SENS-501 (OTOF-GT) is to restore hearing by introducing a functional copy of the OTOF gene directly into hair cells via viral vector technology (AAV). This therapy aims to restore the normal process of converting sound into electrical signals, enabling patients to regain their hearing ability. Currently in the clinical research phase, this gene therapy program represents significant hope for families affected by this rare form of genetic deafness. SENS-501 (OTOF-GT) embodies a commitment to scientific innovation in the field of hearing, with the potential to dramatically improve the quality of life of patients suffering from genetic deafness. This gene therapy for patients suffering from otoferlin deficiency has been developed in the framework of RHU AUDINNOVE, a consortium composed of Sensorion with the Necker Enfants Malades Hospital, the Institut Pasteur, and the Fondation pour l’Audition. The project is partially financed by the French National Research Agency, through the “investing for the future” program (ref: ANR-18-RHUS-0007).

About Sensorion Sensorion is a pioneering clinical-stage biotech company, which specializes in the development of novel therapies to restore, treat, and prevent hearing loss disorders, a significant global unmet medical need. Sensorion has built a unique R&D technology platform to expand its understanding of the pathophysiology and etiology of inner ear related diseases, enabling it to select the best targets and mechanisms of action for drug candidates. It has two gene therapy programs aimed at correcting hereditary monogenic forms of deafness, developed in the framework of its broad strategic collaboration focused on the genetics of hearing with the Institut Pasteur. SENS-501 (OTOF-GT) currently being developed in a Phase 1/2 clinical trial, targets deafness caused by mutations of the gene encoding for otoferlin and GJB2-GT targets hearing loss related to mutations in GJB2 gene to potentially address important hearing loss segments in adults and children. The Company is also working on the identification of biomarkers to improve diagnosis of these underserved illnesses. Sensorion’s portfolio also comprises clinical-stage small molecule programs for the treatment and prevention of hearing loss disorders. Sensorion’s clinical-stage portfolio includes one Phase 2 product: SENS-401 (Arazasetron) progressing in a planned Phase 2 proof of concept clinical study of SENS-401 in Cisplatin-Induced Ototoxicity (CIO) and, with partner Cochlear Limited, has completed in a study of SENS-401 in patients scheduled for cochlear implantation. A Phase 2 study of SENS-401 was also completed in Sudden Sensorineural Hearing Loss (SSNHL) in January 2022. www.sensorion.com

Label: SENSORION ISIN: FR0012596468 Mnemonic: ALSEN

Disclaimer This press release contains certain forward-looking statements concerning Sensorion and its business. Such forward looking statements are based on assumptions that Sensorion considers to be reasonable. However, there can be no assurance that such forward-looking statements will be verified, which statements are subject to numerous risks, including the risks set forth in the 2023 full year report published on March 14, 2024, and available on our website and to the development of economic conditions, financial markets and the markets in which Sensorion operates. The forward-looking statements contained in this press release are also subject to risks not yet known to Sensorion or not currently considered material by Sensorion. The occurrence of all or part of such risks could cause actual results, financial conditions, performance or achievements of Sensorion to be materially different from such forward-looking statements. This press release and the information that it contains do not constitute an offer to sell or subscribe for, or a solicitation of an offer to purchase or subscribe for, Sensorion shares in any country. The communication of this press release in certain countries may constitute a violation of local laws and regulations. Any recipient of this press release must inform oneself of any such local restrictions and comply therewith.

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Investor Relations Noémie Djokovic, Investor Relations and Communication Associate ir.contact@sensorion-pharma.com

Press Relations Ulysse Communication Bruno Arabian / 00 33(0)6 87 88 47 26 barabian@ulysse-communication.com Nicolas Entz / 00 33 (0)6 33 67 31 54 nentz@ulysse-communication.com

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