Regeneron’s Antibody Cocktail REGN-EB3 is First FDA-Approved Treatment for Ebola

Regeneron Pharmaceuticals, Inc. announced that the U.S. FDA approved Inmazeb® (atoltivimab, maftivimab and odesivimab-ebgn) for the treatment of infection caused by Zaire ebolavirus in adult and pediatric patients, including newborns of mothers who have tested positive for the infection.

“We are incredibly proud that the FDA has approved Inmazeb, which is also known as REGN-EB3. This is the first time the FDA has approved a treatment specifically for Ebola, which has caused a number of deadly outbreaks,” said George D. Yancopoulos, M.D., Ph.D., President and Chief Scientific Officer of Regeneron. “Decades of investment in our VelociSuite® rapid response technologies, the dedication of world-class scientists, and the courageous contributions of healthcare providers and patients, together with remarkable cooperation between leading international health organizations and governments, have led to this important moment. As we apply the same sophisticated technologies and manufacturing capabilities against COVID-19, we hope this will be one of many demonstrations of how the power of science can be successfully deployed against dangerous infectious diseases.”

As part of an agreement announced in July 2020, Regeneron will deliver an established number of Inmazeb treatment doses over the course of six years to the Biomedical Advanced Research and Development Authority (BARDA), as part of the U.S. Department of Health and Human Services’ (HHS) goal of building national preparedness for public health emergencies.

In keeping with our mission and values, Regeneron is committed to making this important medicine available to the people who need it. In response to the 2018 Ebola outbreak in the Democratic Republic of the Congo (DRC), we worked with the World Health Organization (WHO), U.S. FDA and other global organizations to offer Inmazeb under a compassionate use protocol and include it in the four-arm PALM (PAmoja TuLinde Maisha) Trial. With BARDA support, we continue to provide Inmazeb for free in response to outbreaks in the DRC through the MEURI protocol for compassionate use. Regeneron is actively working with non-governmental organizations and public health agencies to ensure continued access to Inmazeb in low- and middle-income countries.

“Since 2015, BARDA has partnered with Regeneron to develop a life-saving treatment for Ebola Zaire. The Food and Drug Administration’s approval of Inmazeb shows the power of public private partnerships to bring forward these critical treatments and improve global public health,” said Gary Disbrow, the Acting Director of BARDA. “BARDA is continuing our collaboration with Regeneron on other life-threatening diseases such as MERS and COVID-19, and we look forward to continued success.”

The safety and efficacy of Inmazeb was established through the 681-patient PALM Trial, a randomized, multicenter, controlled trial initiated in 2018 in the DRC. The WHO, the National Institutes of Health (NIH) and the Institut National de Recherche Biomédicale (INRB) in the DRC jointly sponsored and served as co-principal investigators of the trial. In 2019, as reported in the New England Journal of Medicine, the PALM Trial was stopped early following a pre-specified interim analysis that showed superiority of Inmazeb to ZMapp and remdesivir with respect to mortality. Adverse events that occurred in at least 10% of Inmazeb patients were chills, elevation in fever (pyrexia), rapid heartbeat (tachycardia), rapid breathing (tachypnea), vomiting, low blood pressure (hypotension), diarrhea and inadequate oxygen supply to the tissue (hypoxia); of these, only chills occurred more frequently with Inmazeb than ZMapp. The evaluation of AEs in Inmazeb patients may have been confounded by the signs and symptoms of the underlying Zaire ebolavirus infection.

About Inmazeb

Inmazeb, previously called REGN-EB3, was created using Regeneron’s VelocImmune® platform and associated VelociSuite® technologies. The treatment consists of three monoclonal antibodies of similar structure, atoltivimab, maftivimab and odesivimab, that bind to different, non-overlapping epitopes on Zaire ebolavirus glycoprotein. The three antibodies help neutralize the Ebola virus by blocking its ability to invade patients’ and/or enlisting other immune cells to target infected cells and remove them from the body.

Inmazeb is administered as a single, weight-based intravenous infusion (50 mg atoltivimab, 50 mg maftivimab and 50 mg odesivimab per kg). Inmazeb was developed in collaboration and with federal funds from BARDA, part of the Office of the Assistant Secretary for Preparedness and Response at the HHS under ongoing USG Contract Nos. HHSO100201700016C and HHSO100201500013C.

About Regeneron

Regeneron 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 eight FDA-approved treatments and numerous product candidates in development, 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, 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.