Globenewswire·2025-08-14 05:00Core Insights - Sanofi's rilzabrutinib has received orphan designation from the European Medicines Agency for IgG4-related disease, indicating its potential as a treatment for this rare condition [1] - The drug demonstrated efficacy in a phase 2 study, showing a reduction in disease flare and other markers over a 52-week treatment period [2] - Rilzabrutinib has also received orphan designations for other conditions, including immune thrombocytopenia and warm autoimmune hemolytic anemia, and is under regulatory review in multiple regions [3][4] Group 1: Rilzabrutinib Overview - Rilzabrutinib is a novel oral reversible covalent Bruton's tyrosine kinase inhibitor, aimed at treating various rare immune-mediated diseases by restoring immune balance [5] - The drug's mechanism involves selective inhibition of BTK, which is crucial in immune-mediated disease processes [5] Group 2: IgG4-Related Disease - IgG4-related disease is a chronic immune-mediated condition that can affect multiple organs and lead to severe complications, with an estimated prevalence of 8 in 100,000 adult patients in the US annually [6] Group 3: Sanofi's Commitment - Sanofi is focused on advancing new medicines for rare diseases, as evidenced by the orphan designations and ongoing clinical studies for rilzabrutinib [8]