Sarcoglycanopathies

– U.S. FDA has confirmed that screening and dosing may proceed in Study SRP-9005-101 for LGMD2C/R5 – Enrollment and dosing completed in Study SRP-9004-102 for LGMD2D/R3 – Data expected for SRP-9003 for LGMD2E/R4 by mid-2025 CAMBRIDGE, Mass.--(BUSINESS WIRE)--Apr. 15, 2025-- Sarepta Therapeutics, Inc. (NASDAQ:SRPT), the leader in precision genetic medicine for rare diseases, today shared updates from its clinical programs focused on limb-girdle muscular dystrophy (LGMD) subtypes 2C/R5, 2D/R3, and 2E/R4. SRP-9005 for LGMD type 2C/R5: Following input from the U.S. Food and Drug Administration (FDA), Office of Therapeutic Products (OTP), Sarepta is cleared to proceed with dosing in Study SRP-9005-101 (COMPASS) in the U.S. COMPASS is a first-in-human clinical study of SRP-9005, an investigational gene therapy for LGMD type 2C/R5, or gamma-sarcoglycanopathy. SRP-9004 for LGMD type 2D/R3: Enrollment and dosing is complete in Study SRP-9004-102 (DISCOVERY). DISCOVERY is a phase 1, proof-of-concept study evaluating safety and expression of the alpha-sarcoglycan protein after treatment with SRP-9004, an investigational gene therapy for the treatment of LGMD type 2D/R3, or alpha-sarcoglycanopathy. SRP-9003 for LGMD type 2E/R4: Enrollment and dosing is complete in Study SRP-9003-301 (EMERGENE). EMERGENE is a phase 3 clinical trial of SRP-9003 (bidridistrogene xeboparvovec) for the treatment of LGMD type 2E/R4, or beta-sarcoglycanopathy. EMERGENE is a global study and the primary endpoint is the biomarker expression of beta-sarcoglycan protein. A pre-Biologics License Application (BLA) meeting has occurred and the OTP has confirmed eligibility for the accelerated approval pathway for the program. Sarepta remains on track to submit a BLA to the U.S. FDA in the second half of 2025. “There are no disease-modifying treatments approved for patients with any subtype of limb-girdle muscular dystrophy, and the unmet medical need is significant. Following feedback from U.S. FDA, we are pleased to announce that screening can proceed in Sarepta’s first clinical study for a gene therapy for individuals with LGMD type 2C – the fourth LGMD program that Sarepta has advanced into the clinic,” said Louise Rodino-Klapac, Ph.D., executive vice president, chief scientific officer and head of research and development, Sarepta Therapeutics. “In addition to our progress with SRP-9004 and SRP-9005, we remain on track to share data in the first half of this year from the EMERGENE study with SRP-9003. Our confidence in the potential for gene therapy to bring meaningful treatments to patients with rare, genetic based diseases remains high and the rapid progress across our LGMD pipeline is encouraging.” About Limb-Girdle Muscular Dystrophy Limb-girdle muscular dystrophies (LGMD) are genetic diseases that cause progressive, debilitating weakness and wasting that begins in muscles around the hips and shoulders before progressing to muscles in the arms and legs. There are more than 30 distinct subtypes of LGMD, each with a unique genetic mutation and distinct symptoms, progression, and treatment approaches. Sarepta’s leading LGMD pipeline currently has gene therapy programs in different stages of development for LGMD 2B/R2, LGMD 2E/R4, LGMD 2D/R3, LGMD 2C/R5, and LGMD 2A/R1 which together represent more than 70 percent of known LGMD cases. Sarepta is also the sponsor of JOURNEY, a natural history study evaluating disease progression for four LGMD subtypes: 2C/R5, 2D/R3, 2E/R4 and 2A/R1. JOURNEY is actively enrolling globally. About SRP-9003 (bidridistrogene xeboparvovec) SRP-9003 (bidridistrogene xeboparvovec) is an investigational gene therapy that uses the AAVrh74 vector, which is designed to be systemically and robustly delivered to skeletal, diaphragm and cardiac muscle, making it an ideal candidate to treat neuromuscular diseases. SRP-9003 is intended to deliver a full-length beta-sarcoglycan transgene and uses the MHCK7 promoter, chosen for its ability to robustly express in the heart1,2,3 which is critically important for patients with limb-girdle muscular dystrophy Type 2E (LGMD2E), also known as beta-sarcoglycanopathy and LGMDR4, many of whom die from pulmonary or cardiac complications. About SRP-9004 (patidistrogene bexoparvovec) SRP-9004 (patidistrogene bexoparvovec) is an investigational gene therapy for limb-girdle muscular dystrophy Type 2D (LGMD2D/R3). LGMD2D/R3 causes muscle weakness and primarily affects the muscles around the hips, shoulders, and thighs. SRP-9004 is engineered using the AAVrh74 vector, which is designed to be systemically and robustly delivered to skeletal, diaphragm and cardiac muscle, making it an ideal candidate to treat neuromuscular diseases. Intended to deliver a full-length alpha-sarcoglycan transgene, SRP-9004 uses the tMCK promoter, chosen for its ability to selectively express in skeletal muscle which is critically important for patients with LGMD2D/R3. About SRP-9005 SRP-9005 is an investigational gene therapy for patients with limb-girdle muscular dystrophy Type 2C (LGMD2C/R5), also known as gamma-sarcoglycanopathy. SRP-9005 is intended to deliver a full-length gamma-sarcoglycan transgene using the AAVrh74 vector. SRP-9005 uses the MHCK7 promoter, chosen for its ability to robustly express in the heart, which is critically important for those with LGMD2C, many of whom die from pulmonary or cardiac complications. About Sarepta Therapeutics Sarepta is on an urgent mission: engineer precision genetic medicine for rare diseases that devastate lives and cut futures short. We hold leadership positions in Duchenne muscular dystrophy (Duchenne) and limb-girdle muscular dystrophies (LGMDs) and are building a robust portfolio of programs across muscle, central nervous system, and cardiac diseases. For more information, please visit www.sarepta.com or follow us on LinkedIn, X, Instagram and Facebook. Internet Posting of Information We routinely post information that may be important to investors in the 'For Investors' section of our website at www.sarepta.com. We encourage investors and potential investors to consult our website regularly for important information about us. Forward-Looking Statements In order to provide Sarepta’s investors with an understanding of its current results and future prospects, this press release contains statements that are forward-looking. Any statements contained in this press release that are not statements of historical fact may be deemed to be forward-looking statements. Words such as “believes,” “anticipates,” “plans,” “expects,” “will,” “may,” “intends,” “prepares,” “looks,” “potential,” “possible” and similar expressions are intended to identify forward-looking statements. These forward-looking statements include statements relating to our future operations, business plans, market opportunities, priorities and research and development programs and technologies; the potential benefits of our technologies, scientific approaches and strategic partnerships; and expected milestones and plans, including beginning dosing in Study SRP-9005-101, sharing data from our EMERGENE study in the first half of the year, and our expectation to file a BLA for SRP-9003 in the second half of 2025. These forward-looking statements involve risks and uncertainties, many of which are beyond Sarepta’s control. Actual results could materially differ from those stated or implied by these forward-looking statements as a result of such risks and uncertainties. Known risk factors include the following: success in preclinical and clinical trials, especially if based on a small patient sample, does not ensure that later clinical trials will be successful, and the results of future research may not be consistent with past positive results or may fail to meet regulatory approval requirements for the safety and efficacy of product candidates; the expected benefits and opportunities related to our agreements with strategic partners may not be realized or may take longer to realize than expected due to a variety of reasons, including any inability of the parties to perform their commitments and obligations, challenges and uncertainties inherent in product research and development and manufacturing limitations; if the actual number of patients suffering from the diseases we aim to treat is smaller than estimated, our revenue and ability to achieve profitability may be adversely affected; we may not be able to execute on our business plans, including meeting our expected or planned regulatory milestones and timelines, research and clinical development plans, and bringing our product candidates to market, for various reasons, some of which may be outside of our control, including possible limitations of company financial and other resources, manufacturing limitations that may not be anticipated or resolved for in a timely manner, and regulatory, court or agency decisions, such as decisions by the United States Patent and Trademark Office with respect to patents that cover our product candidates; and those risks identified under the heading “Risk Factors” in our most recent Annual Report on Form 10-K for the year ended December 31, 2024 filed with the Securities and Exchange Commission (SEC) as well as other SEC filings made by the Company which you are encouraged to review. References View source version on businesswire.com: https://www.businesswire.com/news/home/20250415170851/en/ Investor Contact: Ian Estepan 617-274-4052 iestepan@sarepta.com Media Contacts: Tracy Sorrentino 617-301-8566 tsorrentino@sarepta.com Kristen Stancil 617-528-8183 kstancil@sarepta.com Source: Sarepta Therapeutics, Inc.

– Sarepta anticipates filing for accelerated approval of SRP-9003 in 2025 CAMBRIDGE, Mass.--(BUSINESS WIRE)--Dec. 18, 2024-- Sarepta Therapeutics, Inc. (NASDAQ:SRPT), the leader in precision genetic medicine for rare diseases, today announced that enrollment and dosing is complete in EMERGENE (Study SRP-9003-301), a Phase 3 clinical trial of SRP-9003 (bidridistrogene xeboparvovec). SRP-9003 is an investigational gene therapy for the treatment of limb-girdle muscular dystrophy Type 2E/R4 (LGMD2E/R4), or beta-sarcoglycanopathy. EMERGENE is a global study, and the primary endpoint is the biomarker expression of beta-sarcoglycan protein, the absence of which is the sole cause of LGMD2E/R4. “The completion of enrollment in the EMERGENE study marks a significant milestone to bring a potentially disease-modifying treatment to individuals living with LGMD2E, an ultra-rare form of LGMD with no treatments beyond symptom management. We are committed to securing approval of SRP-9003 as quickly as possible and are now closer to reaching that goal for patients and their families,” said Louise Rodino-Klapac, Ph.D., executive vice president, chief scientific officer and head of research and development, Sarepta Therapeutics. “The design of EMERGENE is an important precedent that informs development plans for Sarepta’s other LGMD pipeline programs, including our LGMD2D program which we just initiated and our LGMD2C program which we expect to initiate in the first quarter of 2025, and serves as a pathfinder for heterogenous neuromuscular gene therapies more broadly.” Data from EMERGENE are expected in the first half of 2025. Assuming a positive pre-Biologics License Application (BLA) meeting and supportive data from EMERGENE, Sarepta anticipates submitting a BLA to the U.S. Food and Drug Administration seeking accelerated approval for SRP-9003 in 2025. About Study SRP-9003-301 (EMERGENE) EMERGENE, Study 9003-301 is a Phase 3, multinational, open-label study of SRP-9003 for the treatment of LGMD2E/R4 in ambulatory and non-ambulatory participants, ages 4 and older. EMERGENE’s primary endpoint is expression of beta-sarcoglycan 60 days after dosing. Secondary outcomes and endpoints include functional measures through month 60 and safety. About SRP-9003 (bidridistrogene xeboparvovec) SRP-9003 (bidridistrogene xeboparvovec) is an investigational gene therapy that uses the AAVrh74 vector, which is designed to be systemically and robustly delivered to skeletal, diaphragm and cardiac muscle, making it an ideal candidate to treat neuromuscular diseases. SRP-9003 is intended to deliver a full-length beta-sarcoglycan transgene and uses the MHCK7 promoter, chosen for its ability to robustly express in the heart1,2,3 which is critically important for patients with limb-girdle muscular dystrophy Type 2E (LGMD2E), also known as beta-sarcoglycanopathy and LGMDR4, many of whom die from pulmonary or cardiac complications. About Limb-girdle Muscular Dystrophy Limb-girdle muscular dystrophies are genetic diseases that cause progressive, debilitating weakness and wasting that begins in muscles around the hips and shoulders before progressing to muscles in the arms and legs. Patients with LGMD Type 2E/R4 (beta-sarcoglycanopathy) typically begin showing neuromuscular symptoms such as difficulty running, jumping and climbing stairs before age 10. The disease, which is an autosomal recessive subtype of LGMD, frequently progresses to loss of ambulation in the teen years and often leads to early mortality. About Sarepta Therapeutics Sarepta is on an urgent mission: engineer precision genetic medicine for rare diseases that devastate lives and cut futures short. We hold leadership positions in Duchenne muscular dystrophy (DMD) and limb-girdle muscular dystrophies (LGMDs), and we currently have more than 40 programs in various stages of development. Our vast pipeline is driven by our multi-platform Precision Genetic Medicine Engine in gene therapy, RNA and gene editing. For more information, please visit www.sarepta.com or follow us on LinkedIn, X (formerly Twitter), Instagram and Facebook. Internet Posting of Information We routinely post information that may be important to investors in the 'For Investors' section of our website at www.sarepta.com. We encourage investors and potential investors to consult our website regularly for important information about us. Forward-Looking Statements This press release contains “forward-looking statements.” Any statements that are not statements of historical fact may be deemed to be forward-looking statements. Words such as “believe,” “anticipate,” “plan,” “expect,” “will,” “may,” “intend,” “prepare,” “look,” “potential,” “possible” and similar expressions are intended to identify forward-looking statements. These forward-looking statements include, without limitation, statements relating to our future operations, technologies and scientific approaches, business plans, priorities, research and development programs, the potential benefits of SRP-9003, including SRP-9003 serving as a pathfinder for certain gene therapy more broadly, and expected plans and milestones, including data from EMERGENE in the first half of 2025 and potentially submitting a BLA in 2025, and initiating our LGMD2C program in the first quarter of 2025. Actual results could materially differ from those stated or implied by these forward-looking statements as a result of such risks and uncertainties. Known risk factors include the following: our data may not be sufficient for obtaining regulatory approval; success in preclinical and clinical trials, especially if based on a small patient sample, does not ensure that later clinical trials will be successful, and the results of future research may not be consistent with past positive results or with advisory committee recommendations, or may fail to meet regulatory approval requirements for the safety and efficacy of product candidates; we may not be able to comply with all FDA requests in a timely manner or at all; the possible impact of regulations and regulatory decisions by the FDA and other regulatory agencies on our business; the commencement and completion of our clinical trials and announcement of results may be delayed or prevented for a number of reasons, including, among others, denial by the regulatory agencies of permission to proceed with our clinical trials, or placement of a clinical trial on hold, challenges in identifying, recruiting, enrolling and retaining patients to participate in clinical trials and inadequate quantity or quality of supplies of a product candidate or other materials necessary to conduct clinical trials; different methodologies, assumptions and applications we use to assess particular safety or efficacy parameters may yield different statistical results, and even if we believe the data collected from clinical trials of our product candidates are positive, these data may not be sufficient to support approval by the FDA or other global regulatory authorities; we may not be able to execute on our business plans, including meeting our expected or planned regulatory milestones and timelines, research and clinical development plans, and bringing our product candidates to market, for various reasons, many of which may be outside of our control, including possible limitations of company financial and other resources, manufacturing limitations that may not be anticipated or resolved for in a timely manner, regulatory, court or agency decisions, such as decisions by the United States Patent and Trademark Office with respect to patents that cover our product candidates; and those risks identified under the heading “Risk Factors” in our most recent Annual Report on Form 10-K for the year ended December 31, 2023, and Form 10-Q filed with the Securities and Exchange Commission (SEC) as well as other SEC filings made by the Company, which you are encouraged to review. Any of the foregoing risks could materially and adversely affect the Company’s business, results of operations and the trading price of Sarepta’s common stock. For a detailed description of risks and uncertainties Sarepta faces, you are encouraged to review the SEC filings made by Sarepta. We caution investors not to place considerable reliance on the forward-looking statements contained in this press release. Sarepta does not undertake any obligation to publicly update its forward-looking statements based on events or circumstances after the date hereof, except as required by law. Source: Sarepta Therapeutics, Inc. References: View source version on businesswire.com: https://www.businesswire.com/news/home/20241218625378/en/ Investor Contact: Ian Estepan, 617-274-4052 iestepan@sarepta.com Media Contact: Tracy Sorrentino, 617-301-8566 tsorrentino@sarepta.com Source: Sarepta Therapeutics, Inc.

EVRY, France--( BUSINESS WIRE )-- Atamyo Therapeutics a clinical-stage biotechnology company focused on the development of new generation gene therapies targeting muscular dystrophies and cardiomyopathies, today announced that the U.S. Food & Drug Administration (FDA) has cleared its Investigational New Drug (IND) application for ATA-200 to proceed in a Phase 1b/2b clinical trial. ATA-200 is a one-time gene therapy for the treatment of γ-sarcoglycan related limb-girdle muscular dystrophy Type 2C/R5 (LGMD2C/R5), a serious and debilitating condition that affects children and leads to loss of ambulation before adulthood. The multicenter Phase1b open-label dose escalation study ( NCT05973630 ) will evaluate safety, pharmacodynamics, efficacy, and immunogenicity in children receiving intravenous ATA-200, a single-dose Adeno-Associated Virus (AAV) vector carrying the human γ-sarcoglycan transgene. The deployment in the US of Atamyo’s clinical trial of ATA-200 is funded by The Dion Foundation for Children with Rare Diseases . This study has already received regulatory clearance in France and Italy. “This IND clearance in an important step to bring ATA-200 to US children suffering from this highly debilitating LGMD-2C/R5 disease,” said Sophie Olivier, MD, Chief Medical Officer of Atamyo. “We are proud to be the first treatment for LGMD-2C/R5 to enter into clinical development in the US and we are committed to opening the first US center before year-end,” added Stéphane Degove, Atamyo’s Chief Executive Officer. In addition, Atamyo announced the US FDA has awarded Orphan Drug Designation for ATA-200. Orphan Drug Designations by the FDA grants seven years of market exclusivity in the US. This Orphan Drug Designation for ATA-200 was granted a few weeks after ATA-200 received Rare Pediatric Disease Designation by the FDA. LGMD-2C/R5 is a rare genetic disease caused by mutations in the gene that produces γ-sarcoglycan, a transmembrane protein that is involved in the connection between muscle fibers and their environment. It affects an estimated 2,000 people in Europe and in the US. In the classical form, symptoms appear in early childhood and patients suffer from progressive muscular weakness leading to loss of ambulation before adulthood. Cardiac involvement, typically presenting as dilated cardiomyopathy, is reported in approximately half of patients and will eventually impact life expectancy. There is no curative treatment. The management of LGMD-2C/R5 is solely supportive. ATA-200, the gene therapy for LGMD-2C/R5, delivers a normal copy of the gene for production of γ-sarcoglycan. In preclinical mice models, ATA-200 demonstrated its tolerability and capability to correct symptoms and biomarkers of the pathology. Atamyo plans to initiate enrolling patients for this clinical trial in the 4 th quarter of 2024. The therapy is based on the research of Atamyo Chief Scientific Officer Isabelle Richard, Ph.D., Research Director at CNRS who heads the Progressive Muscular Dystrophies Laboratory at Genethon. About Atamyo Therapeutics Atamyo Therapeutics is a clinical-stage biopharma focused on the development of a new generation of effective and safe gene therapies for neuromuscular diseases. A spin-off of gene therapy pioneer Genethon, Atamyo leverages unique expertise in AAV-based gene therapy and muscular dystrophies from the Progressive Muscular Dystrophies Laboratory at Genethon. Atamyo’s most advanced programs address different forms of limb-girdle muscular dystrophies (LGMD), with two clinical-stage programs targeting respectively LGMD-R9 and LGMD-R5. The name of the company is derived from two words: Celtic Atao which means “Always” or “Forever” and Myo which is the Greek root for muscle. Atamyo conveys the spirit of its commitment to improve the life of patients affected by neuromuscular diseases with life-long efficient treatments. For more information visit www.atamyo.com