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RLS-0071 (pegtarazimod) granted orphan drug designation by the EMA

By Devon Else

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Aug 22, 2025

Learning objective: After reading this article, learners will be able to cite a new clinical development in acute GvHD.


On August 21, 2025, the European Medicines Agency granted orphan drug designation to RLS-0071 (pegtarazimod), an investigational dual-targeting anti-inflammatory peptide, for the treatment of graft-versus-host disease.1 RLS-0071 modulates both neutrophil and complement-mediated inflammatory pathways by selectively inhibiting complement activation at C1, while also suppressing myeloperoxidase activity and the formation of neutrophil extracellular traps.1 The designation was supported by preliminary data from an ongoing phase II study (NCT06343792) assessing the safety and efficacy of pegtarazimod in a cohort of patients with steroid-refractory acute graft-versus-host-disease.Data from additional cohorts enrolled in this trial are expected in 2026. 

Pegtarazimob was previously granted orphan drug designation and fast track designation by the U.S. Food and Drug Administration for the treatment of patients with steroid-refractory acute graft-versus-host-disease.

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