Sanofi and Regeneron's Dupixent approved in Japan as the first targeted medicine to treat adults with bullous pemphigoid

• Approval in moderate-to-severe patients was based on pivotal study results showing over four times more Dupixent patients experienced sustained disease remission through Week 36 compared with placebo
• BP is a chronic, relapsing skin disease with underlying type 2 inflammation characterized by intense itch alongside painful blisters and other lesions
• BP is the seventh approved indication for Dupixent in Japan
  
  

Paris and Tarrytown, NY, March 24, 2026. The Ministry of Health, Labour and Welfare in Japan has granted marketing and manufacturing authorization for Dupixent (dupilumab) for the treatment of adults with moderate-to-severe bullous pemphigoid (BP).

The approval in Japan is based on data from the pivotal LIBERTY-BP-ADEPT phase 2/3 study (clinical study identifier: NCT04206553), which evaluated Dupixent in adults with moderate-to-severe BP. Patients were randomized to receive Dupixent 300 mg (n=53) or placebo (n=53) added to standard-of-care oral corticosteroids (OCS). During treatment, all patients underwent a protocol-defined OCS tapering regimen if control of disease activity was maintained. For the primary endpoint, more than four times as many patients on Dupixent experienced sustained disease remission compared to placebo (18% vs. 4%; p=0.0250) at Week 36 in the companies' core dataset used for the regulatory submission in Japan.

Treatment-related adverse events (AEs) occurred in 26% of Dupixent patients and 15% of placebo patients. The treatment-related AE most commonly reported with Dupixent was conjunctivitis (4%).

In addition to BP, Dupixent is approved in Japan in certain patients with atopic dermatitis, asthma, chronic rhinosinusitis with nasal polyposis (CRSwNP), prurigo nodularis, chronic spontaneous urticaria (CSU), and chronic obstructive pulmonary disease (COPD).

About BP
BP is a rare skin disease that primarily affects elderly patients, and is characterized by intense itch, painful blisters, and lesions, as well as reddening of the skin. It can be chronic and relapsing with underlying type 2 inflammation. The blisters and rash can form over much of the body and cause the skin to bleed and break down, resulting in patients being more prone to infection and affecting their daily functioning. Available treatment options are limited and can add to overall disease burden by suppressing a patient's immune system.

About ADEPT
ADEPT was a randomized, double-blind, placebo-controlled phase 2/3 study evaluating the efficacy and safety of Dupixent in 106 adults with moderate-to-severe BP for a 52-week treatment period. After randomization, patients received Dupixent or placebo every two weeks (Q2W) after an initial loading dose, along with OCS treatment. During treatment, OCS taper was initiated after patients experienced two weeks of sustained control of disease activity. OCS tapering could start between four to six weeks after randomization and was continued if disease control was maintained, with the intent of completion by Week 16. After OCS tapering, patients were only treated with Dupixent or placebo for the rest of the study (rescue treatment could be used if required).

The primary endpoint evaluated the proportion of patients achieving sustained disease remission at Week 36. Sustained disease remission was defined as complete clinical remission with completion of OCS taper by Week 16 without relapse after completion of the OCS taper and no rescue therapy use during the 36-week treatment period. Relapse was defined as appearance of ≥3 new lesions a month or ≥1 large lesion or urticarial plaque (>10 cm in diameter) that did not heal within a week. Rescue therapy could include treatment with high-potency topical corticosteroids, OCS (including increase of OCS dose during the taper or re-initiation of OCS after completion of the OCS taper), or systemic non-steroidal immunosuppressive medications or immunomodulating biologics.

About Dupixent
Dupixent (dupilumab) is now available in Japan as a 300 mg pre-filled syringe or pre-filled pen for adults with BP. Dupixent is intended for injection under the skin (subcutaneous injection) and is given Q2W after an initial loading dose. It can be given in a clinic or at home by self-administration 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, CRSwNP, eosinophilic esophagitis, prurigo nodularis, CSU, COPD, BP, and allergic fungal rhinosinusitis in different age populations. More than 1.4 million 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 12,000 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 lichen simplex chronicus. 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, 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
Sanofi is an R&D driven, AI-powered biopharma company committed to improving people's lives and delivering compelling growth. We apply our deep understanding of the immune system to invent medicines and vaccines that treat and protect millions of people around the world, with an innovative pipeline that could benefit millions more. Our team is guided by one purpose: we chase the miracles of science to improve people's lives; this inspires us to drive progress and deliver positive impact for our people and the communities we serve, by addressing the most urgent healthcare, environmental, and societal challenges of our time.

Sanofi is listed on EURONEXT: SAN and NASDAQ: SNY.

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