UCB's minzasolmin, partnered with Novartis, failed in a phase 2a trial for Parkinson's, missing primary and secondary endpoints. The trial involved 496 early-stage patients. UCB terminated the extension phase, analyzing biomarker data. Despite setbacks, UCB continues exploring alpha-synuclein pathology with UCB7583 and another Parkinson's candidate, glovadalen, in phase 2 trials.