CI

At a glance

ClinicalIndex Comparison Record
Phase 2Active· 586 enrolled / 586 target
Drug / intervention
Prasinezumab +1 moredrug
Likely dose
Not stated in record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT04777331
NCT04777331Phase 2ActiveUpdate Overdue (9.5/mo)Completion was 21mo ago

A Phase IIB, Randomized, Double-Blind, Placebo-Controlled, Multicenter Study to Evaluate the Efficacy and Safety of Intravenous Prasinezumab in Participants With Early Parkinson's Disease

Hoffmann-La Roche·interventional·Posted Mar 2, 2021·Updated Jun 23, 2026

In Brief

A Phase 2 clinical trial evaluating Prasinezumab and Placebo for Parkinsons Disease. Active but no longer recruiting, targeting 586 participants across 110 sites in 9 countries.

Signals

Enrollment appears stalled

Detailed Summary

This is a multicenter, randomized, double-blind, placebo-controlled study that will evaluate the efficacy and safety of intravenous (IV) prasinezumab versus placebo in participants with Early Parkinson's Disease (PD) who are on stable symptomatic PD medication.

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
CountriesAustria, Canada, France, Italy, Luxembourg, Poland, Spain, United Kingdom, United States

Timeline

Phase 2Active
20212022202320242025202620272028202920302031
First PostedMar 2, 2021
Enrollment StartMay 5, 2021
Primary CompletionSep 11, 2024
Study CompletionJun 30, 2031
TodayJul 2, 2026
Enrollment to primary: 3.4 yearsPosted 5.3 years ago

Arms & Interventions

Prasinezumabexperimental

Participants will receive an IV infusion of prasinezumab every 4 weeks (Q4W). Participants will enter into the optional Open Label Extension (OLE) once the double-blind treatment period has completed.

Drug: Prasinezumab
Placeboplacebo_comparator

Participants will receive placebo as an IV infusion Q4W.

Drug: Placebo

Interventions

Prasinezumabdrug

Prasinezumab will be administered as an IV infusion to participants Q4W.

Placebodrug

Prasinezumab placebo will be administered to participants.