Three times more patients treated with Kevzara achieved sustained remission compared to placebo in Phase 3 trial

Kevzara now approved to treat two chronic inflammatory disorders

TARRYTOWN, NY and CAMBRIDGE, MA, USA I February 28, 2023 I Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) and Sanofi today announced that the U.S. Food and Drug Administration (FDA) has approved Kevzara® (sarilumab) for the treatment of polymyalgia rheumatica (PMR), an inflammatory rheumatic disease, in adult patients who have had an inadequate response to corticosteroids or who cannot tolerate corticosteroid taper.

“Polymyalgia rheumatica can be an incapacitating disease, causing painful disease flares in multiple parts of the body that leave people fatigued and unable to fully perform everyday activities. Corticosteroids have been the primary treatment to date, but many patients do not adequately respond to steroids or cannot be tapered off steroids, which puts such patients at risk of complications from long-term steroid therapy,” said George D. Yancopoulos, M.D., Ph.D., President and Chief Scientific Officer at Regeneron. “With the approval of Kevzara for polymyalgia rheumatica, patients now have an FDA-approved treatment to help offer relief from the disabling symptoms of this disease and long-term dependance on steroids.”

The FDA evaluated the Kevzara application for PMR under Priority Review, which is granted to therapies that have the potential to provide significant improvements in the treatment, diagnosis or prevention of serious conditions. Kevzara was previously approved for the treatment of moderately-to-severely active rheumatoid arthritis (RA) in adult patients who have had an inadequate response or intolerance to one or more disease-modifying antirheumatic drugs.

PMR often initially presents with pain and stiffness around the neck, shoulder and hip area and symptoms include fatigue, low-grade fever and weight loss. Patients often experience flares during tapering of, or relapse after discontinuation of corticosteroid (CS) treatment. Patients with PMR report difficulty in carrying out everyday functions such as getting out of bed, standing up from a chair, or lifting their arms. PMR generally affects people who are 50 years and older.

“Until now, people living with polymyalgia rheumatica have had limited treatment options for this serious rheumatic condition, which causes significant pain and discomfort,” said Bill Sibold, Executive Vice President, Head, Specialty Care at Sanofi. “The approval of Kevzara as the first and only biologic for polymyalgia rheumatica is a new option for patients and the healthcare professionals who treat them.”

The FDA approval for this additional indication for Kevzara is based on results from the SAPHYR Phase 3 randomized clinical trial in patients with steroid-resistant active PMR, who flared on ≥7.5 mg/day prednisone or equivalent during taper. In the trial, patients were randomized to receive either Kevzara 200 mg every two weeks along with a 14-week taper of CS (n=60; 1 patient randomized but not treated) or placebo every two weeks along with a 52-week CS taper (n=58). At 52 weeks, the trial met its primary endpoint with 28% of Kevzara-treated patients achieving sustained remission compared to 10% for placebo (p=0.0193). Sustained remission was defined as being in disease remission by week 12, absence of disease flare, C-reactive protein normalization from weeks 12 to 52, and adherence to the CS taper protocol from weeks 12 to 52.

A sensitivity analysis removing acute phase reactants (measures of ongoing inflammation) maintained significance (proportion difference for Kevzara vs. placebo: 18%; 95% confidence interval: 3.1 to 32.6) and confirmed the primary outcome. In addition, an analysis of a secondary endpoint showed that the median cumulative CS dose was 777 mg for Kevzara, compared to 2044 mg for placebo.

The common adverse reactions occurring in ≥5% of patients treated with Kevzara (n=59) were neutropenia (15%), leukopenia (7%), constipation (7%), rash pruritic (5%), myalgia (7%), fatigue (5%), and injection site pruritus (5%). Serious adverse reaction of neutropenia occurred in 2 patients (3%) in the Kevzara group compared to none in the placebo group (n=58). In both cases of neutropenia, the participants had a neutrophil count less than 500 per mm3 without any infections; neutropenia resolved following permanent discontinuation of study drug. The most common adverse reactions that resulted in permanent discontinuation of therapy with Kevzara were neutropenia occurring in 3 patients (5%) and infection in 3 separate patients (5%), including COVID-19 (n=1), intervertebral discitis (n=1), and pneumonia (n=1).

Regeneron and Sanofi are committed to helping patients in the U.S. who are prescribed Kevzara gain access to the medicine and receive the support they may need. KevzaraConnect®, a comprehensive and specialized program that provides support services to patients throughout every step of the treatment process, can help eligible patients who are uninsured, lack coverage, or need copay assistance. Additionally, KevzaraConnect offers support from registered nurses and other specialists who are available 24/7 to speak with patients and help them navigate the complex insurance process. For more information, please call 1-844-KevzaraCall: 1-844-Kevzara (1-844-538-9272) or visit

About Kevzara
In addition to PMR, Kevzara is approved in multiple countries to treat adults with moderately to severely active rheumatoid arthritis who have not responded to or tolerated previous therapy. Kevzara, which was invented using Regeneron’s proprietary VelocImmune® technology, binds specifically to the IL-6 receptor and has been shown to inhibit IL-6-mediated signaling. IL-6 is an immune system protein produced in increased quantities in patients with rheumatoid arthritis and has been associated with disease activity, joint destruction and other systemic problems.

Sarilumab is being jointly developed by Regeneron and Sanofi under a global collaboration agreement.

About Regeneron’s VelocImmune Technology
Regeneron’s VelocImmune technology utilizes a proprietary genetically engineered mouse platform endowed with a genetically humanized immune system to produce optimized fully human antibodies. When Regeneron’s co-Founder, President and Chief Scientific Officer George D. Yancopoulos was a graduate student with his mentor Frederick W. Alt in 1985, they were the first to envision making such a genetically humanized mouse, and Regeneron has spent decades inventing and developing VelocImmune and related VelociSuite® technologies. Dr. Yancopoulos and his team have used VelocImmune technology to create a substantial proportion of all original, FDA-approved or authorized fully human monoclonal antibodies. This includes REGEN-COV® (casirivimab and imdevimab), Dupixent, Libtayo® (cemiplimab-rwlc), Praluent® (alirocumab), Kevzara® (sarilumab), Evkeeza® (evinacumab-dgnb) and Inmazeb® (atoltivimab, maftivimab and odesivimab-ebgn).

U.S. Indications and Important Safety Information
KEVZARA® (sarilumab) is an injectable prescription medicine called an interleukin-6 (IL-6) receptor blocker. KEVZARA is used to treat adult patients with:

  • moderately to severely active rheumatoid arthritis (RA) after at least one other medicine called a disease-modifying antirheumatic drug (DMARD) has been used and did not work well or could not be tolerated.
  • polymyalgia rheumatica (PMR) after corticosteroids have been used and did not work well or when a slow decrease in the dose of corticosteroids (taper) cannot be tolerated.

Please click here to see full Prescribing Information including risk of SERIOUS SIDE EFFECTS and Medication Guide.

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 for 35 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 more information, please visit or follow @Regeneron on Twitter.

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 some 100 countries, 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.

SOURCE: Regeneron Pharmaceuticals