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Immune Tolerance, Restored.

Our Company

AbolerIS Pharma is a clinical-stage biopharmaceutical company committed to improving the lives of people suffering from autoimmune diseases and organ transplantation rejection.  We are developing potentially best-in-class and first-in-class, curative-intent therapies designed to restore immune tolerance by inducing an immune system reset.

Our Sciene

AbolerIS Pharma aims to develop potentially best-in-class and first-in-class, curative-intent therapies designed to restore immune tolerance by inducing an immune system reset.

Lead Program

At AbolerIS, we envision a future where patients suffering from autoimmune diseases can enjoy long-term remission and improved quality of life through therapies that are effective and safe. We are advancing a novel class of antibodies that target CD45RC, a key marker on pathogenic Effector T and B cells. Treatment with the antibody restores immune tolerance by selectively depleting the Effector cells, while preserving Regulatory cells and overall immune memory.

AbolerIS’ lead program in Phase 1, ABO21009, is designed to demonstrate broad efficacy in multiple autoimmune disorders with large unmet medical needs including rheumatoid arthritis (RA), inflammatory bowel disease (IBD), and organ transplantation.

Latest updates

AbolerIS Pharma is one of the laureates of the REACT-EU program 2022

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Nantes, France, November 22, 2022 – AbolerIS Pharma is a pre-clinical stage biotech company specialized in the development of innovative immunomodulators for the treatment of transplant rejection, graft-versus-host-disease and auto-immune…

AbolerIS Pharma Announces First Patient Dosed in Part II of Phase 1 Study of ABO21009, a Novel Anti-CD45RC Antibody, for Rheumatoid Arthritis

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ABO21009's unique mechanism of action depletes pathogenic Effector T and B cells while inducing expansion of Regulatory T cells for lasting efficacy, and preserving overall immunityGOSSELIES, Belgium and NANTES, France, Jan.…

AbolerIS Pharma Announces Publication in Molecular Therapy Cell Press Journal of New Preclinical Results Supporting Mechanism of Action of ABO21009, a First-in-Class Anti-CD45RC Antibody, Currently in Phase 1

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-Results highlight the potential to transform treatment of autoimmune diseases, organ transplant rejection and GVHD- Gosselies, Belgium and Nantes, France, November 12, 2025 /PRNewswire/ -- AbolerIS Pharma (“AbolerIS”), a clinical-stage…