Anaptys Announces Late-Breaking Oral Presentation of Complete Phase 2b Data for Rosnilimab in Rheumatoid Arthritis at Upcoming ACR Convergence 2025

SAN DIEGO , Oct. 13, 2025 (GLOBE NEWSWIRE) -- AnaptysBio, Inc. (Nasdaq: ANAB), a clinical-stage biotechnology company focused on delivering innovative immunology therapeutics, today announced that complete data from the Phase 2b trial of rosnilimab, a pathogenic T cell depleter, in rheumatoid arthritis (RA), was accepted for a late-breaking oral presentation at American College of Rheumatology (ACR) Convergence 2025 in Chicago, IL , Oct. 24 – 29, 2025. “We are honored to be selected by ACR to present our late-breaking Phase 2b data for rosnilimab in RA,” said Paul Lizzul , chief medical officer of Anaptys. “Being selected reinforces the transformational potential of rosnilimab, which delivered a compelling safety and tolerability profile and JAK-like efficacy through six months that was durable for at least three months off-drug. We look forward to Professor Emery’s presentation later this month.” Presentation Details: Abstract Title – Rosnilimab, a Selective and Potent Depleter of Pathogenic T Cells, Demonstrates Efficacy, Safety, and Translational Proof of Mechanism in a Rheumatoid Arthritis Phase 2b Trial Abstract ID - 2215555 Session Date and Time - Wednesday, Oct. 29 from 8:00am – 9:30am CT Paul Emery , M.D., professor, Rheumatology, University of Leeds , ​Leeds Biomedical Research Centre, U.K. , will be the presenting author. The presentation will be available for download on the Anaptys website after the session here . About Rosnilimab Rosnilimab is a novel therapeutic antibody that directly targets pathogenic T cells, such as activated Tph/Tfh and T effector cells, in the periphery or inflamed tissue. When activated, these T cells proliferate and migrate and secrete inflammatory cytokines that are the drivers of autoimmune and inflammatory diseases. Rosnilimab is designed to selectively and potently deplete pathogenic T cells in both inflamed tissue and the periphery while sparing nonpathogenic T cells, including naïve T cells, to preserve overall immune function and restore immune homeostasis. This drives specific immunological outcomes, such as a reduction in T cell proliferation, migration and cytokine secretion, and a reduction of plasma cell generation and autoantibody levels. About Anaptys Anaptys is a clinical-stage biotechnology company focused on delivering innovative immunology therapeutics for autoimmune and inflammatory diseases. Its lead program, rosnilimab, a pathogenic T cell depleter, completed a Phase 2b trial for the treatment of rheumatoid arthritis and is in a Phase 2 trial for the treatment of ulcerative colitis. The company’s pipeline also includes ANB033, a CD122 antagonist, being studied in celiac disease and ANB101, a BDCA2 modulator, both in Phase 1 trials. Anaptys has also discovered and out-licensed in financial collaborations multiple therapeutic antibodies, including a PD-1 antagonist ( Jemperli (dostarlimab-gxly)) to GSK and an IL-36R antagonist (imsidolimab) to Vanda Pharmaceuticals. To learn more, visit www.AnaptysBio.com or follow us on LinkedIn . Anaptys recently announced the intent to separate its biopharma operations from its substantial royalty assets by year-end 2026, enabling investors to align their investment philosophies and portfolio allocation with the strategic opportunities and financial objectives of each company. Learn more here . Contact: Nick Montemarano Executive Director, Investor Relations 858.732.0178 [email protected] Source: AnaptysBio, Inc.

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