Decibel Therapeutics announced that Regeneron has extended the research term of its collaboration with the Company to discover and develop gene therapies for hearing loss. The research term will be extended to November 15, 2023, and Regeneron will pay Decibel an extension fee of $10 million in Fourth Quarter of 2022. Under the collaboration launched in 2017, Decibel is developing three gene therapy programs targeting congenital, monogenic hearing loss with Regeneron. Decibel plans to initiate in 2022 a Phase 1/2 clinical trial of DB-OTO, the Company?s lead gene therapy product candidate, designed to provide hearing to individuals born with profound hearing loss due to mutation of the otoferlin gene. Decibel is also advancing AAV.103 and AAV.104, gene therapy programs targeting other monogenic forms of hearing loss, with Regeneron. AAV.103 aims to restore hearing in individuals with mutations in the GJB2 gene, and AAV.104 aims to restore hearing in individuals with mutations in the STRC gene. Through the collaboration, Regeneron provides Decibel with broad access to its proprietary suite of technologies to support Decibel's goal of discovering new medicines for congenital, monogenic hearing loss. Regeneron also directly participates in and provides financial support for Decibel's research and development efforts under the collaboration through milestone payments and reimbursement intended to fund approximately half of the costs of the collaboration programs. Decibel retains worldwide development and commercialization rights to the product candidates being developed in the collaboration and will pay Regeneron tiered royalties based on net sales.