Prothena's Alzheimer's Trial Hit by High ARIA-E Rates, Resulting in 'Non-Competitive' Profile on August 28, 2025 Alzheimer 's disease amyloid beta antibody ARIA-E ASCENT Cerebral Edema clinical program non-competitive profile Prothena PRX012 subcutaneous administration +
Roche Advances Prasinezumab Into Phase III Trials for Parkinson’s Despite Mixed Phase II Results on June 16, 2025 alpha-synuclein antibody Biological Markers Clinical Trials disease-modifying treatment PADOVA study Parkinson 's disease Pasadena Phase 3 Clinical Trials Prasinezumab Prothena Roche (company) +
Prothena Halts Drug and Plans Major Layoffs After Second Rare Disease Trial Failure on May 27, 2025 AL birtamimab business options drug failure layoffs Phase 3 Clinical Trials Primary amyloidosis Prothena spending +