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Dupixent approved in the EU as the first and only medicine for young children with eosinophilic esophagitis

• Approval based on phase 3 data showing significantly more children aged one to 11 years on Dupixent achieved histological disease remission at 16 weeks compared to placebo, which was sustained up to one year
• Dupixent is the first-ever medicine in the EU indicated to treat these young patients, who persistently struggle to eat at a critical stage in life where growth is crucial

Paris and Tarrytown, NY, November 6, 2024. The European Medicines Agency has approved Dupixent (dupilumab) to treat eosinophilic esophagitis (EoE) in children as young as one year of age. Specifically, the approval covers children aged one to 11 years who weigh at least 15 kg and who are inadequately controlled by, intolerant to, or who are not candidates for conventional medicinal therapy. This expands the initial approval in the European Union (EU) for EoE in adults and adolescents and makes Dupixent the first and only medicine indicated to treat these young patients. Dupixent is also approved in this young age group in the US and Canada.  

Roberta Giodice
President, ESEO Italia
“Young children with eosinophilic esophagitis are at the beginning of their life-long journey with a disease that challenges their ability to eat. Parents of these children have often relied on restrictive diets that do not specifically address the disease and can stunt their growth at a critical time in development that could impact them for years to come. We are pleased that research continues and offers new treatment options to improve the quality of their care.”

Houman Ashrafian, MD, PhD
Executive Vice President, Head of Research and Development, Sanofi
“Up to half of all children in the EU with eosinophilic esophagitis remain uncontrolled despite existing standard of care treatment options, and, as a result, many of these young patients struggle to maintain weight due to serious symptoms such as difficulty swallowing and vomiting. This milestone provides an important new treatment for pediatric patients who were previously without options specifically approved for their disease. With this novel approach to addressing an underlying cause of eosinophilic esophagitis, Dupixent has the potential to give these young children a better chance to thrive.”

The approval is based on the two-part (Part A and B) EoE KIDS phase 3 study in children aged one to 11 years, which established a bridge showing the response to Dupixent in children with EoE is similar to that of the approved adult and adolescent populations. In Part A, children who received a higher dose of Dupixent (n=37) based on a weight-based dosing regimen experienced the following outcomes, compared to placebo (n=34) at 16 weeks:

• 68% achieved histological disease remission (≤6 eosinophils/high power field) compared to 3%, the primary endpoint. These results were sustained for up to one year in Part B of the study.
• 86% reduction in peak esophageal intraepithelial eosinophil count from baseline compared to a 21% increase.
• Reductions in abnormal endoscopic findings and disease severity and extent (as measured at the microscopic level).
• Nominally significant improvement in the frequency and severity of EoE signs, and numerical reduction in days with at least one sign of EoE, based on caregiver-reported outcomes.

The safety results in the EoE KIDS study were generally consistent with the known safety profile of Dupixent in adolescents and adults with EoE. The most common adverse reactions for Dupixent overall are injection site reactions, conjunctivitis, conjunctivitis allergic, arthralgia, oral herpes and eosinophilia. In addition, the adverse reaction of injection site bruising was reported in EoE. In patients aged one to 11 years, adverse events more commonly observed with Dupixent (≥10%) in either weight-based dosing regimen compared to placebo during Part A were COVID-19, nausea, injection site pain, and headache. The long-term safety profile of Dupixent evaluated in Part B was similar to that observed during Part A.

George D. Yancopoulos, M.D., Ph.D.
Board co-Chair, President, and Chief Scientific Officer at Regeneron
“Eosinophilic esophagitis presents a unique challenge in young children, who struggle with their basic ability to eat during a time in their lives where proper nutrition is essential for growth and development. This approval will bring the proven efficacy and demonstrated safety profile of Dupixent to this vulnerable, young population that has already been established in older EoE patients and has the potential to transform the standard of care for children with EoE who previously had no therapies specifically approved for them.”

About EoE
EoE is a chronic, progressive disease associated with type-2 inflammation that is thought to be responsible for damaging the esophagus and impairing its function. Diagnosis is difficult, as symptoms can be mistaken for other conditions leading to delays in diagnosis. EoE can severely impact a child’s ability to eat and may also cause vomiting, abdominal pain, difficulty swallowing, decreased appetite, and challenges thriving. Continuous management of EoE may be needed to reduce the risk of complications and disease progression.

About the Dupixent pediatric EoE study
The EoE KIDS phase 3 study was a randomized, double-blind, placebo-controlled study evaluating the efficacy and safety of Dupixent in children aged one to 11 years with EoE. Part A enrolled 71 patients and evaluated Dupixent at a weight-based dose regimen, compared to placebo, for 16 weeks. Part B was a 36-week extended active treatment period in which eligible children from Part A in the Dupixent group continued treatment, while those in the placebo group switched to Dupixent. Patients included in this trial were previously treated and did not respond to conventional medicinal therapies, including proton pump inhibitors and/or swallowed topical corticosteroids.

The primary endpoint was histologic remission at 16 weeks, and secondary endpoints included assessments of endoscopic and histopathologic measures of the severity of disease along with caregiver-reported clinical signs and symptoms of EoE. The 108-week open-label extension period (Part C) to evaluate longer-term outcomes was recently completed.

Results from the study were published in The New England Journal of Medicine.

About Dupixent
Dupixent (dupilumab) is an injection administered under the skin (subcutaneous injection) at different injection sites. In patients aged one to 11 years with EoE, Dupixent is administered every other week (200 mg for children ≥15 to <30 kg, 300 mg for children ≥30 to <40 kg) or every week (300 mg for children ≥40 kg), based on weight. Dupixent is intended for use under the guidance of a healthcare professional and can be given in a clinic or at home administered by a caregiver after training by a healthcare professional.

Dupixent is a fully human monoclonal antibody that inhibits the signaling of the interleukin-4 (IL4) and interleukin-13 (IL13) pathways and is not an immunosuppressant. The Dupixent development program has shown significant clinical benefit and a decrease in type-2 inflammation in phase 3 studies, establishing that IL4 and IL13 are two of the key and central drivers of the type-2 inflammation that plays a major role in multiple related and often co-morbid diseases.

Dupixent has received regulatory approvals in more than 60 countries in one or more indications including certain patients with atopic dermatitis, asthma, chronic rhinosinusitis with nasal polyps, EoE, prurigo nodularis, chronic spontaneous urticaria, and chronic obstructive pulmonary disease in different age populations. More than 1,000,000 patients are being treated with Dupixent globally.

Dupilumab development program
Dupilumab is being jointly developed by Sanofi and Regeneron under a global collaboration agreement. To date, dupilumab has been studied across more than 60 clinical studies involving more than 10,000 patients with various chronic diseases driven in part by type-2 inflammation.

In addition to the currently approved indications, Sanofi and Regeneron are studying dupilumab in a broad range of diseases driven by type-2 inflammation or other allergic processes in phase 3 studies, including chronic pruritus of unknown origin and bullous pemphigoid. These potential uses of dupilumab are currently under clinical investigation, and the safety and efficacy in these conditions have not been fully evaluated by any regulatory authority.

About Regeneron
Regeneron REGN is a leading biotechnology company that invents, develops and commercializes life-transforming medicines for people with serious diseases. Founded and led by physician-scientists, our unique ability to repeatedly and consistently translate science into medicine has led to numerous approved treatments and product candidates in development, most of which were homegrown in our laboratories. Our medicines and pipeline are designed to help patients with eye diseases, allergic and inflammatory diseases, cancer, cardiovascular and metabolic diseases, neurological diseases, hematologic conditions, infectious diseases, and rare diseases.

Regeneron pushes the boundaries of scientific discovery and accelerates drug development using our proprietary technologies, such as VelociSuite^®, which produces optimized fully human antibodies and new classes of bispecific antibodies. We are shaping the next frontier of medicine with data-powered insights from the Regeneron Genetics Center^® and pioneering genetic medicine platforms, enabling us to identify innovative targets and complementary approaches to potentially treat or cure diseases.

For more information, please visit www.Regeneron.com or follow Regeneron on LinkedIn, Instagram, Facebook or X.

About Sanofi
We are an innovative global healthcare company, driven by one purpose: we chase the miracles of science to improve people’s lives. Our team, across the world, is dedicated to transforming the practice of medicine by working to turn the impossible into the possible. We provide potentially life-changing treatment options and life-saving vaccine protection to millions of people globally, while putting sustainability and social responsibility at the center of our ambitions.
Sanofi is listed on EURONEXT: SAN and NASDAQ: SNY

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