Core Insights - Chiesi Global Rare Diseases and Protalix BioTherapeutics received a negative opinion from the CHMP of the EMA regarding the approval of a new dosing regimen for Elfabrio (pegunigalsidase alfa) [1][2] - The proposed regimen of 2 mg/kg every 4 weeks was not deemed to have sufficient efficacy compared to the currently approved regimen of 1 mg/kg every 2 weeks [1][2] Company Overview - Chiesi Global Rare Diseases is a unit of the Chiesi Group focused on innovative therapies for rare diseases [1][16] - Protalix BioTherapeutics specializes in developing recombinant therapeutic proteins using its proprietary ProCellEx® plant cell-based expression system [1][19] - Both companies are committed to reducing the treatment burden for patients with Fabry disease [2][20] Clinical Trial Insights - The CHMP review was based on data from the BRIGHT trial and its extension study, which had a median exposure of almost six years [2] - The data from these studies, along with modeling and exposure-response analyses from prior trials, were insufficient to demonstrate similar efficacy for the new dosing regimen [2] Fabry Disease Context - Fabry disease is a rare lysosomal storage disorder caused by mutations in the GLA gene, leading to serious health complications [11][12] - Early detection and access to treatment are critical for managing symptoms and slowing disease progression [12] Safety Information - Elfabrio is indicated for adults with confirmed Fabry disease and has been associated with hypersensitivity reactions, including anaphylaxis [3][4] - In clinical trials, 14% of patients experienced hypersensitivity reactions, with 3% experiencing anaphylaxis [6][9]