Late-breaking Phase 3 data at AAD 2022 show Dupixent® (dupilumab) significantly improved signs and symptoms of prurigo nodularis

• Dupixent significantly reduced itch at 12 weeks, and at 24 weeks nearly three times as many Dupixent patients experienced clinically meaningful reductions in itch and skin lesions
• There are currently no approved systemic treatments for prurigo nodularis; regulatory filings for prurigo nodularis planned in the first half of 2022

Paris and Tarrytown, N.Y. March 26, 2022. Detailed positive results from the Phase 3 PRIME2 trial evaluating the safety and efficacy of Dupixent^® (dupilumab) was presented today in a late-breaking session at the American Academy of Dermatology (AAD) 2022 Annual Meeting. The companies previously announced topline results from PRIME2 and a second trial called PRIME investigating the use of Dupixent in adults with uncontrolled prurigo nodularis. In both trials, Dupixent significantly reduced itch and skin lesions compared to placebo. In total, 21 scientific abstracts evaluating the safety and efficacy of Dupixent in patients with atopic dermatitis in different age groups, as well as investigational indications – prurigo nodularis and chronic spontaneous urticaria – will be presented at the congress.

Gil Yosipovitch, M.D.

Professor of Dermatology, Miller School of Medicine, University of Miami, and principal investigator of the PRIME2 trial

“Prurigo nodularis is a relentless and often misunderstood itchy skin disease that leaves many patients with uncontrolled symptoms such as unbearable itch and painful skin lesions, along with a significantly impaired quality of life that should not be underestimated. These positive results are the first time a Phase 3 trial has demonstrated that targeting key drivers of type 2 inflammation, IL-4 and IL-13, with dupilumab significantly improved itch and skin lesions in this highly burdensome disease.”

The randomized, placebo-controlled PRIME2 trial met primary and all key secondary endpoints with data presented at AAD 2022 showing:

• 37% of Dupixent patients experienced a clinically meaningful reduction in itch from baseline compared to 22% of placebo patients (p=0.0216) at week 12, the primary endpoint.
• Nearly three times as many Dupixent patients experienced a clinically meaningful reduction in itch from baseline at week 24: 58% of Dupixent patients compared to 20% of placebo patients (p<0.0001).
• Nearly three times as many Dupixent patients achieved clear or almost clear skin at week 24: 45% of Dupixent patients compared to 16% of placebo patients (p<0.0001).

The safety results of the trial were generally consistent with the known safety profile of Dupixent in its approved dermatology indications. For the 24-week treatment period, overall rates of adverse events were generally similar between Dupixent and placebo groups (57% Dupixent, 51% placebo). Adverse events that were more commonly (>5%) observed with Dupixent were herpes viral infections (7% Dupixent, 0% placebo). A lower rate of skin infections were observed with Dupixent (5% Dupixent, 9% placebo). Additionally, 3% of Dupixent patients and 30% of placebo patients discontinued prior to week 24.

Results from the confirmatory PRIME trial will be presented at an upcoming medical congress. Data from both trials will form the basis of regulatory submissions around the world for Dupixent in prurigo nodularis, which are planned to begin in the first half of 2022.

The potential use of Dupixent in prurigo nodularis is currently under clinical development, and the safety and efficacy have not been fully evaluated by any regulatory authority.

About Prurigo Nodularis

People with prurigo nodularis experience intense, persistent itch, with thick skin lesions (called nodules) that can cover most of the body. Prurigo nodularis is often described as painful with burning, stinging and tingling of the skin. The impact of uncontrolled prurigo nodularis on quality of life is one of the highest among inflammatory skin diseases due to the extreme itch and is comparable to other debilitating chronic diseases that can negatively affect mental health, activities of daily living and social interactions. High-potency topical steroids are commonly prescribed but are associated with safety risks if used long term. There are approximately 75,000 people in the U.S. who are unable to control their disease with systemic therapy and are most in need of a treatment option.

About the Trial

PRIME2, part of the LIBERTY-PN PRIME clinical program, is a randomized, Phase 3, double-blind, placebo-controlled trial that evaluated the efficacy and safety of Dupixent in 160 adults with prurigo nodularis inadequately controlled with topical prescription therapies or with whom those therapies were not advisable. During the 24-week treatment period, patients received Dupixent or placebo every two weeks with or without topical treatments (low- or medium-dose topical corticosteroids or topical calcineurin inhibitors were continued if patients were using these treatments at randomization).

The primary endpoint evaluated the proportion of patients with clinically meaningful improvement in itch at week 12 (measured by a ≥4-point reduction in Worst-Itch Numeric Rating Scale [WI-NRS] of 0-10). Key secondary endpoints included the proportion of patients with clinically meaningful improvement in itch at week 24 and the proportion of patients with clear or almost clear skin at week 24 (measured by a score of 0 or 1 on the Investigator's Global Assessment PN-Stage [IGA PN-S] 0-4 scale).

About Dupixent

Dupixent is a fully human monoclonal antibody that inhibits the signaling of the interleukin-4 (IL-4) and interleukin-13 (IL-13) pathways and is not an immunosuppressant. IL-4 and IL-13 are key and central drivers of the type 2 inflammation that plays a major role in atopic dermatitis, asthma and chronic rhinosinusitis with nasal polyposis (CRSwNP).

Dupixent is currently approved in the U.S., Europe, Japan and other countries around the world for use in specific patients with moderate-to-severe atopic dermatitis, as well as certain patients with asthma or CRSwNP in different age populations. Dupixent is also approved in one or more of these indications in more than 60 countries around the world and more than 400,000 patients have been treated globally.

Dupilumab Development Program

Dupilumab is being jointly developed by Sanofi and Regeneron under a global collaboration agreement. To date, dupilumab has been studied in more than 60 clinical trials 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, including prurigo nodularis (Phase 3), pediatric atopic dermatitis (6 months to 5 years of age, Phase 3), hand and foot atopic dermatitis (Phase 3), eosinophilic esophagitis (Phase 3), chronic spontaneous urticaria (Phase 3), bullous pemphigoid (Phase 3), chronic inducible urticaria-cold (Phase 3), chronic obstructive pulmonary disease with evidence of type 2 inflammation (Phase 3), chronic rhinosinusitis without nasal polyposis (Phase 3), allergic fungal rhinosinusitis (Phase 3), allergic bronchopulmonary aspergillosis (Phase 3) and peanut allergy (Phase 2). 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 (NASDAQ: REGN) is a leading biotechnology company that invents life-transforming medicines for people with serious diseases. Founded and led for over 30 years by physician-scientists, our unique ability to repeatedly and consistently translate science into medicine has led to nine FDA-approved treatments and numerous product candidates in development, almost all 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, pain, hematologic conditions, infectious diseases and rare diseases.

Regeneron is accelerating and improving the traditional drug development process through our proprietary VelociSuite technologies, such as VelocImmune, which uses unique genetically humanized mice to produce optimized fully human antibodies and bispecific antibodies, and through ambitious research initiatives such as the Regeneron Genetics Center, which is conducting one of the largest genetics sequencing efforts in the world.

For additional information about the company, please visit www.regeneron.com or follow @Regeneron on Twitter.