Dupixent® (dupilumab) Approved in the U.S. as the First New Targeted Therapy in Over a Decade for Chronic Spontaneous Urticaria (CSU)

Approval based on Phase 3 trials demonstrating Dupixent significantly reduced itch and hives compared to placebo

In the U.S., there are more than 300,000 adults and adolescents aged 12 years and older living with CSU who remain symptomatic despite antihistamine treatment

CSU is the seventh disease with underlying type 2 inflammation in which Dupixent is approved

TARRYTOWN, N.Y. and PARIS, April 18, 2025 (GLOBE NEWSWIRE) -- Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) and Sanofi today announced that the U.S. Food and Drug Administration (FDA) has approved Dupixent® (dupilumab) for the treatment of adults and adolescents aged 12 years and older with chronic spontaneous urticaria (CSU) who remain symptomatic despite histamine-1 (H1) antihistamine treatment.

“People with chronic spontaneous urticaria experience sudden, unpredictable hives and severe itch that cause a significant, and often overwhelming, burden on their everyday lives,” said Kenneth Mendez, President and Chief Executive Officer at the Asthma and Allergy Foundation of America. “The approval of this treatment offers patients more options and the chance to control their disease.”

“Dupixent is the first new targeted treatment for chronic spontaneous urticaria, or CSU, in over ten years, with pivotal trials demonstrating its ability to help patients significantly reduce the hallmark symptoms of intense itch and unpredictable hives associated with this disease,” said George D. Yancopoulos, M.D., Ph.D., Board co-Chair, President and Chief Scientific Officer at Regeneron, and a principal inventor of Dupixent. “With this FDA decision, Dupixent is now approved for seven chronic, debilitating atopic conditions driven in part by underlying type 2 inflammation, several of which have been shown to co-morbidly occur with CSU, such as atopic dermatitis and asthma – providing patients with one treatment that might help multiple atopy conditions. We look forward to bringing Dupixent to the more than 300,000 CSU patients in the U.S. with inadequately controlled disease on standard-of-care treatment who, until now, had limited treatment options.”

The U.S. approval is based on data from two Phase 3 clinical trials, Study A (n=136) and Study C (n=148), which included biologic-naïve patients aged 12 years and older who were symptomatic despite the use of antihistamines and assessed Dupixent as an add-on therapy to standard-of-care antihistamines, compared to antihistamines alone. Both trials met their primary and key secondary endpoints with Dupixent demonstrating reductions in itch severity and urticaria activity (a composite of itch and hives) compared to placebo at 24 weeks. Dupixent also increased the likelihood of well-controlled disease or complete response compared to placebo at 24 weeks. Study B (n=108) provided additional safety data and evaluated Dupixent in patients aged 12 years and older who were inadequate responders or intolerant to anti-IgE therapy and symptomatic despite antihistamine use.

Safety results from Study A, Study B and Study C were generally consistent with the known safety profile of Dupixent in its approved indications. In pooled data from all three trials, the most common adverse event (≥2%) more frequently observed in patients on Dupixent compared to placebo was injection site reactions.

“CSU patients with uncontrolled disease experience highly burdensome itch and hives that can significantly disrupt daily living,” said Alyssa Johnsen, M.D., Ph.D., Global Therapeutic Area Head, Immunology and Oncology Development at Sanofi. “This FDA approval provides a new treatment option to help address the underlying drivers of these severe and recurring signs and symptoms. Dupixent has the potential to improve outcomes for CSU patients who previously had limited treatment options.”

Dupixent is already approved for CSU in Japan, the United Arab Emirates (UAE) and Brazil. Submissions are currently under review with other regulatory authorities around the world including in the European Union.

About Chronic Spontaneous UrticariaCSU is a chronic inflammatory skin disease driven in part by type 2 inflammation, which causes sudden and debilitating hives and recurring itch. CSU is typically treated with H1 antihistamines, medicines that target H1 receptors on cells to control symptoms of itch and urticaria. However, the disease remains uncontrolled despite antihistamine treatment in many patients, some of whom are left with limited alternative treatment options. These individuals continue to experience symptoms that can be debilitating and significantly impact their quality of life. More than 300,000 people in the U.S. suffer from CSU that is inadequately controlled by antihistamines.

About the Dupixent CSU Phase 3 Trial Program The LIBERTY-CUPID Phase 3 program evaluating Dupixent for CSU consists of Study A, Study B and Study C. These trials were randomized, double-blind, placebo-controlled clinical trials that evaluated the efficacy and safety of Dupixent as an add-on therapy to standard-of-care antihistamines compared to antihistamines alone. Studies A and C were replicate trials that assessed patients aged 6 years and older who remained symptomatic despite the use of antihistamines. Study B was conducted in patients aged 12 years and older who were symptomatic despite use of antihistamines and were inadequate responders or intolerant to anti-IgE therapy. During the 24-week treatment period in all three trials, patients received an initial loading dose followed by 300 mg Dupixent every two weeks, except for pediatric patients weighing