Press Release: Sanofi's efdoralprin alfa met all primary and key secondary endpoints in alpha-1 antitrypsin deficiency emphysema phase 2 study

Sanofi’s efdoralprin alfa met all primary and key secondary endpoints in alpha-1 antitrypsin deficiency emphysema phase 2 study Efdoralprin alfa demonstrated superiority in a head-to-head study versus a standard of care plasma-derived therapy Results reinforce the potential of efdoralprin alfa to be the first restorative recombinant therapy that normalizes and maintains functional AAT levels Phase 2 data support both three-week and four-week dosing regimens for efdoralprin alfa - a potentially significant improvement in convenience - compared to a plasma-derived therapy dosed weekly Paris, October 22, 2025. Positive results from the global ElevAATe phase 2 study (clinical study identifier: NCT05856331) showed that efdoralprin alfa (SAR447537, formerly known as INBRX-101), met all primary and key secondary endpoints when dosed every three weeks (Q3W) or four weeks (Q4W) in adults with alpha-1 antitrypsin deficiency (AATD) emphysema, a rare disease. Efdoralprin alfa is an investigational recombinant human alpha-1 antitrypsin (AAT)-Fc fusion protein. It demonstrated a statistically significant greater mean increase in functional AAT levels within normal range as measured by trough concentrations at steady state compared to those receiving weekly plasma-derived augmentation therapy at week 32 [p<0.0001]. The study also met key secondary endpoints, demonstrating superior mean increase in fAAT average concentration as well as higher percentage of days above the lower limit of the normal range for both Q3W and Q4W dosing. The recombinant efdoralprin alfa was well tolerated with a similar adverse event profile to plasma-derived therapy. Additional safety follow-up will be assessed in the ElevAATe OLE phase 2 study (clinical study identifier: NCT05897424). “These data demonstrate that efdoralprin alfa achieved consistently higher normal functional AAT levels, with less frequent dosing, compared to a current standard of care,” said Christopher Corsico, Global Head of Development at Sanofi. “This is particularly meaningful as maintaining protective protein levels is the cornerstone of pulmonary management of AATD and currently available treatments require weekly therapeutic infusions. The ElevAATe results represent the potential for efdoralprin alfa to be a restorative recombinant therapeutic option for the AATD community, reinforcing our commitment to develop treatments for both rare and respiratory conditions with great unmet medical need.” “AATD is a debilitating condition that can be challenging to treat,” said Igor Barjaktarevic, MD, PhD, Associate Professor, David Geffen School of Medicine at UCLA and primary investigator on the ElevAATe phase 2 study. “Achieving and maintaining normal AAT levels with less frequent dosing and with complete independence from blood donation programs would be a welcome change to the current treatment experience for people living with AATD. With the current standard of care, patients reach but do not maintain normal protein levels between the infusions, leaving a remaining unmet need. I’m encouraged by the ElevAATe trial results and what efdoralprin alfa could mean for the AATD community.” Efdoralprin alfa was previously granted fast track and orphan drug designation by the US Food and Drug Administration (FDA) for the treatment of AATD emphysema. Efdoralprin alfa is currently under clinical investigation, and its safety and efficacy have not been evaluated by any regulatory authority. Sanofi plans to present the data at a forthcoming medical meeting and engage with global regulatory authorities on the appropriate next steps. About AATDAATD is a rare, inherited disorder characterized by low levels or absence of AAT, a protein produced by the liver that protects the lungs from inflammation and damage.1,3 The disease causes progressive deterioration of the tissue of the lungs and liver.1,4 Without adequate AAT levels, affected individuals often experience lung damage and develop COPD, including emphysema, and in severe forms of the disease, patients can sometimes require lung transplantation. Plasma-derived therapies were introduced in 1987 to treat the condition but since then, no new therapies have been introduced. About 235,000 people worldwide live with AATD, with nearly 100,000 people in the US, but about 90% of individuals with AATD are likely undiagnosed. About efdoralprin alfaEfdoralprin alfa (SAR447537, formerly known as INBRX-101) is a recombinant human AAT-Fc fusion protein being investigated as a restorative therapy in adults with AATD emphysema, with Q3W or Q4W dosing. The investigational treatment is being studied to restore functional AAT levels to the normal range and inhibit neutrophil elastase, an enzyme that can cause lung tissue damage in patients with AATD. Efdoralprin alfa was granted fast track designation and orphan drug designation by the FDA for the treatment of AATD emphysema. About ElevAATeThe ElevAATe phase 2 study was a double-blind, randomized study evaluating efdoralprin alfa versus a standard of care plasma-derived augmentation therapy in patients with AATD emphysema. Ninety-seven patients were randomized 2:2:1 to receive efdoralprin alfa every three weeks or every four weeks, or plasma-derived augmentation therapy once weekly. The primary endpoint was the mean change in average fAAT concentrations as measured from baseline to average serum trough fAAT concentrations at steady state in patients treated with efdoralprin alfa Q3W or Q4W compared with weekly plasma-derived augmentation therapy, following a treatment period of up to 32 weeks. Key secondary endpoints included mean change in serum fAAT concentration from baseline to fAAT average concentrations at steady state and percentage of days that steady-state functional AAT levels were above the lower limit of the normal range. 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 Media RelationsSandrine Guendoul | +33 6 25 09 14 25 | sandrine.guendoul@sanofi.comEvan Berland | +1 215 432 0234 | evan.berland@sanofi.comLéo Le Bourhis | +33 6 75 06 43 81 | leo.lebourhis@sanofi.com Victor Rouault | +33 6 70 93 71 40 | victor.rouault@sanofi.com Timothy Gilbert | +1 516 521 2929 | timothy.gilbert@sanofi.comLéa Ubaldi | +33 6 30 19 66 46 | lea.ubaldi@sanofi.com Investor RelationsThomas Kudsk Larsen | + 44 7545 513 693 | thomas.larsen@sanofi.comAlizé Kaisserian | + 33 6 47 04 12 11 | alize.kaisserian@sanofi.comFelix Lauscher | + 1 908 612 7239 | felix.lauscher@sanofi.comKeita Browne | + 1 781 249 1766 | keita.browne@sanofi.comNathalie Pham | + 33 7 85 93 30 17 | nathalie.pham@sanofi.comTarik Elgoutni | + 1 617 710 3587 | tarik.elgoutni@sanofi.comThibaud Châtelet | + 33 6 80 80 89 90 | thibaud.chatelet@sanofi.comYun Li | +33 6 84 00 90 72 | yun.li3@sanofi.com Sanofi forward-looking statementsThis press release contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995, as amended. Forward-looking statements are statements that are not historical facts. These statements include projections and estimates and their underlying assumptions, statements regarding plans, objectives, intentions, and expectations with respect to future financial results, events, operations, services, product development and potential, and statements regarding future performance. Forward-looking statements are generally identified by the words “expects”, “anticipates”, “believes”, “intends”, “estimates”, “plans” and similar expressions. Although Sanofi’s management believes that the expectations reflected in such forward-looking statements are reasonable, investors are cautioned that forward-looking information and statements are subject to various risks and uncertainties, many of which are difficult to predict and generally beyond the control of Sanofi, that could cause actual results and developments to differ materially from those expressed in, or implied or projected by, the forward-looking information and statements. These risks and uncertainties include among other things, the uncertainties inherent in research and development, future clinical data and analysis, including post marketing, decisions by regulatory authorities, such as the FDA or the EMA, regarding whether and when to approve any drug, device or biological application that may be filed for any such product candidates as well as their decisions regarding labelling and other matters that could affect the availability or commercial potential of such product candidates, the fact that product candidates if approved may not be commercially successful, the future approval and commercial success of therapeutic alternatives, Sanofi’s ability to benefit from external growth opportunities, to complete related transactions and/or obtain regulatory clearances, risks associated with intellectual property and any related pending or future litigation and the ultimate outcome of such litigation, trends in exchange rates and prevailing interest rates, volatile economic and market conditions, cost containment initiatives and subsequent changes thereto, and the impact that global crises may have on us, our customers, suppliers, vendors, and other business partners, and the financial condition of any one of them, as well as on our employees and on the global economy as a whole. The risks and uncertainties also include the uncertainties discussed or identified in the public filings with the SEC and the AMF made by Sanofi, including those listed under “Risk Factors” and “Cautionary Statement Regarding Forward-Looking Statements” in Sanofi’s annual report on Form 20-F for the year ended December 31, 2024. Other than as required by applicable law, Sanofi does not undertake any obligation to update or revise any forward-looking information or statements. All trademarks mentioned in this press release are the property of the Sanofi group. Press Release

Press Release: Sanofi's efdoralprin alfa met all primary and key secondary endpoints in alpha-1 antitrypsin deficiency emphysema phase 2 study

FAQ

Why Bullish?

How important is it?

Why Long Term?

Related Companies

Related News