Could this antibody be the key to slowing Parkinson's?
NCT ID NCT07174310
First seen Jun 27, 2026 · Last updated Sep 04, 2026 · Updated 6 times
Summary
This study tests an experimental drug called prasinezumab in 900 people with early-stage Parkinson's disease who are already taking levodopa. The goal is to see if the drug can delay worsening of motor symptoms compared to a placebo. Participants receive the drug or placebo by IV infusion, and researchers track changes in movement over time.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 3
Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.
- Participants
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About 900 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Nov 2025
- Expected to finish
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Jun 2031
An estimate. End dates often move.
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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50 to 85 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Body weight within 40-110 kilograms (kg) (88-242 pounds \[lbs\]) and a body mass index within the range 18-34 kg/m2 * Diagnosis of idiopathic PD based on Movement Disorder Society (MDS) criteria * Has received monotherapy treatment * An MDS-UPDRS Part IV score of 0 at screening and prior to randomization * Hoehn and Yahr (H\&Y) Stage 1 or 2 off medication at screening and prior to randomization * Agreement to adhere to the contraception requirements Exclusion Criteria: * Pregnant or breastfeeding, or intention of becoming pregnant during the study or within the time frame in which contraception is required * Medical history indicating a parkinsonian syndrome other than idiopathic PD * Diagnosis of a significant neurologic disease other than PD * Chronic uncontrolled hypertension
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Get notified about this study
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Genom att skicka in godkänner du våra Användarvillkor
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
190 sites in 17 countries. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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A.O. Universitaria Pisana
RECRUITINGPisa, Tuscany, 56126, Italy
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AP-HM- Hôpital de La Timone
RECRUITINGMarseille, Bouches-du-Rhône, 13005, France
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APHP - Hopital Henri Mondor
RECRUITINGCréteil, 94010, France
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APHP - Hopital de la Pitie Salpetriere
RECRUITINGParis, 75013, France
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Aarhus Universitetshospital Skejby
RECRUITINGAarhus N, 8200, Denmark
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Advent Health Orlando
RECRUITINGOrlando, Florida, 32804, United States
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Allegheny General Hospital
RECRUITINGPittsburgh, Pennsylvania, 15212, United States
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Asan Medical Center
RECRUITINGSeoul, 05505, South Korea
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Asheville Neurology
RECRUITINGAsheville, North Carolina, 28806, United States
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Avera Medical Group
RECRUITINGSioux Falls, South Dakota, 57105, United States
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Az. Osp. OO.RR. S. Giovanni di Dio e Ruggi D' Aragona
RECRUITINGSalerno, Campania, 84131, Italy
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Azienda Ospedaliera Spedali Civili
RECRUITINGBrescia, Lombardy, 25100, Italy
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Azienda Ospedaliera di Padova
RECRUITINGPadova, Veneto, 35128, Italy
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Baptist Hospital of Miami
RECRUITINGMiami, Florida, 33176, United States
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Barrow Neurological Institute
RECRUITINGPhoenix, Arizona, 85013, United States
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Beijing Friendship Hospital Affiliated of Capital University of Medical Science
RECRUITINGBeijing, 100050, China
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Beijing Hospital of Ministry of Health
RECRUITINGBeijing, 100730, China
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Beijing Tian Tan Hospital,Capital Medical University
RECRUITINGBeijing, 100071, China
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Bispebjerg Hospital;Neurologisk Afdeling
RECRUITINGKøbenhavn NV, 2400, Denmark
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Boramae Medical Center
RECRUITINGSeoul, 07061, South Korea
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CHU de Clermont-Ferrand - Site Gabriel-Montpied
RECRUITINGClermont-Ferrand, 63000, France
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CHU de Grenoble - Hôpital André Michallon
RECRUITINGLa Tronche, 38700, France
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CHU de Limoges - Hôpital Dupuytren
RECRUITINGLimoges, 87042, France
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CHU de Montpellier - Hôpital Gui de Chauliac
RECRUITINGMontpellier, 34295, France
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CHU de Nice Hopital Pasteur
RECRUITINGNice, 06002, France
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CHU de Toulouse - Hôpital Purpan
RECRUITINGToulouse, 31059, France
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CHUM
RECRUITINGMontreal, Quebec, H2X 0A9, Canada
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CNS - Campus Neurológico
RECRUITINGTorres Vedras, 2560-280, Portugal
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Campus for Ageing and Vitality
RECRUITINGNewcastle, NE4 5PL, United Kingdom
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Central Texas Neurology Consultants
RECRUITINGRound Rock, Texas, 78681, United States
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Centro Parkinson e Parkinsonismi
RECRUITINGMilan, Lombardy, 20126, Italy
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Centro de Pesquisas Clinicas
RECRUITINGSão Paulo, São Paulo, 01228-200, Brazil
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Chang Gung Memorial Hospital - Linkou
RECRUITINGTaoyuan City, 333, Taiwan
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Changhua Christian Hospital
RECRUITINGChanghua County, 500, Taiwan
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Charing Cross Hospital
RECRUITINGLondon, W6 8RF, United Kingdom
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Charite Universitaetsmedizin Berlin - Campus Benjamin Franklin
RECRUITINGBerlin, 12203, Germany
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Charite Universitätsmed. Berlin
RECRUITINGBerlin, 10117, Germany
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Charter Research - Winter Park/Orlando
RECRUITINGOrlando, Florida, 32803, United States
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China Medical University Hospital
RECRUITINGNorth Dist., 40447, Taiwan
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Cleveland Clinic
RECRUITINGCleveland, Ohio, 44195, United States
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Cleveland Clinic Lou Ruvo
RECRUITINGLas Vegas, Nevada, 89106, United States
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Columbia University Medical Center
RECRUITINGNew York, New York, 10032, United States
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Complejo Hospitalario Universitario A Coruña
RECRUITINGA Coruña, LA Coruna, 15006, Spain
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Dent Neurological Institute
RECRUITINGAmherst, New York, 14226, United States
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Duke University Medical Center
RECRUITINGDurham, North Carolina, 27705, United States
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Faculdade de Medicina de Ribeirão Preto - Universidade de Sao Paulo
RECRUITINGRibeirão Preto, São Paulo, 14051-140, Brazil
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Faculdade de Medicina de Sao Jose do Rio Preto - FAMERP*X*
RECRUITINGSão José do Rio Preto, São Paulo, 15090-000, Brazil
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First Affiliated Hospital of Medical College of Xi'an Jiaotong University
RECRUITINGXi'an, 710061, China
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Fujian Medical University Union Hospital
RECRUITINGFuzhou, 350001, China
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Georgetown University
RECRUITINGWashington D.C., District of Columbia, 20007, United States
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Grady Memorial Hospital
RECRUITINGAtlanta, Georgia, 30303, United States
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Guangdong Provincial People's Hospital
RECRUITINGGuangzhou, 510115, China
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Hackensack University Medical Center;Department of Neurology, Neuroscience Institute
RECRUITINGParamus, New Jersey, 07652, United States
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Hawaii Pacific Neuroscience
RECRUITINGHonolulu, Hawaii, 96817, United States
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Heinrich-Heine Universitätsklinik Düsseldorf
RECRUITINGDüsseldorf, 40225, Germany
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Hopital Roger Salengro
RECRUITINGLille, 59037, France
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Hospices Civils de Lyon - Hôpital Pierre Wertheimer
RECRUITINGBron, Rhône, 69003, France
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Hospital Clinic Barcelona
RECRUITINGBarcelona, 08036, Spain
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Hospital Dr. Nélio Mendonça;Serviço de Neurologia
RECRUITINGFunchal, 9004-514, Portugal
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Hospital General De Catalunya
RECRUITINGSant Cugat del Vallès, Barcelona, 08195, Spain
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Hospital General Universitario de Elche
RECRUITINGElche, Alicante, 03203, Spain
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Hospital General de Mexico
RECRUITINGMexico City, Mexico CITY (federal District), 6726, Mexico
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Hospital Pedro Hispano
RECRUITINGMatosinhos Municipality, 4464-513, Portugal
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Hospital Quiron de Madrid
RECRUITINGPozuelo de Alarcón, Madrid, 28223, Spain
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Hospital Regional Universitario de Malaga ? Hospital General
RECRUITINGMálaga, 29009, Spain
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Hospital Ruber Juan Bravo
RECRUITINGMadrid, 28006, Spain
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Hospital Univ 12 de Octubre
RECRUITINGMadrid, 28041, Spain
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Hospital Universitari Vall d Hebron
RECRUITINGBarcelona, 08035, Spain
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Hospital Universitario Fundación Alcorcón
RECRUITINGAlcorcón, Madrid, 28922, Spain
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Hospital Universitario Virgen del Rocio
RECRUITINGSeville, 41013, Spain
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Hospital Universitario de La Princesa
RECRUITINGMadrid, 28006, Spain
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Hospital da Luz Coimbra
RECRUITINGCoimbra, 3020-479, Portugal
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Hospital da Senhora da Oliveira-Guimarães
RECRUITINGGuimarães, Portugal
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Hospital das Clinicas - UFMG
RECRUITINGBelo Horizonte, Minas Gerais, 31270-901, Brazil
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Hospital de Braga
RECRUITINGBraga, 4710-243, Portugal
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Hospital de Santa Maria
RECRUITINGLisbon, 1649-035, Portugal
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Huashan Hospital, Fudan University
RECRUITINGShanghai, 200040, China
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IRCCS Istituto Neurologico Carlo Besta
RECRUITINGMilan, Lombardy, 20133, Italy
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IRCCS Ospedale San Raffaele
RECRUITINGMilan, Lombardy, 20132, Italy
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IRCCS San Raffaele;Clinical Trial Center
RECRUITINGRome, Lazio, 00166, Italy
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Indywidualna Praktyka Lekarska Prof. Dr Hab. N. Med. Konrad Rejdak.
RECRUITINGLublin, 20-410, Poland
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Institute for Neurodegenerative Disorders
RECRUITINGNew Haven, Connecticut, 06510, United States
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Instituto Nacional de Neurologia y Neurocirugia
RECRUITINGMexico City, Mexico CITY (federal District), 14390, Mexico
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Instituto de Neurologia de Curitiba
RECRUITINGCuritiba, Paraná, 81210-310, Brazil
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Instytut Zdrowia Dr Boczarska-Jedynak Sp. z o.o. Sp. k.
RECRUITINGOświęcim, 32-600, Poland
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Irccs A.O.U.San Martino Ist
RECRUITINGGenoa, Liguria, 16132, Italy
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JEM Research LLC
RECRUITINGAtlantis, Florida, 33462, United States
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K2 - Villages
RECRUITINGLady Lake, Florida, 32159, United States
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K2 Medical Research-Maitland
RECRUITINGMaitland, Florida, 32751, United States
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Keck School of Medicine of USC
RECRUITINGLos Angeles, California, 900033, United States
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Kepler Universitätsklinikum GmbH - Neuromed Campus
RECRUITINGLinz, 4020, Austria
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Klinik Ottakring
RECRUITINGVienna, 1160, Austria
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Kliniken Beelitz GmbH
RECRUITINGBeelitz, 14547, Germany
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Klinikum rechts der Isar der TU München
RECRUITINGMunich, 81675, Germany
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Korea University Guro Hospital
RECRUITINGSeoul, 08308, South Korea
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Krakowska Akademia Neurologii Sp z o.o. Centrum Neurologii K
RECRUITINGKrakow, 31-505, Poland
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L2 Ip Instituto de Pesquisas Clinicas Ltda ME
RECRUITINGBrasília, Federal District, 70200-730, Brazil
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LMU Klinikum, Neurologische Klinik und Poliklinik
RECRUITINGMünchen, 81377, Germany
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Massachusetts General Hospital
RECRUITINGBoston, Massachusetts, 02114, United States
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Mazowiecki Szpital Bródnowski w Warszawie Sp. z o.o.
RECRUITINGWarsaw, 03-242, Poland
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Medizinische Hochschule Hannover, Klinik für Neurologie
RECRUITINGHanover, 30625, Germany
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Medizinische Universität Graz
RECRUITINGGraz, 8036, Austria
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Medizinische Universität Wien
WITHDRAWNVienna, 1090, Austria
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Monash Health
RECRUITINGClayton, Victoria, 3168, Australia
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Montreal Neurological Institute and Hospital
RECRUITINGMontreal, Quebec, H3A 2B4, Canada
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NEURO-CARE Sp. z o.o. Sp. Komandytowa
RECRUITINGKatowice, 40-749, Poland
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NZOZ Vitamed
RECRUITINGBydgoszcz, 85-079, Poland
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Nanjing Brain Hospital
RECRUITINGNanjing, 210029, China
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National Cheng Kung University Hospital
RECRUITINGTainan, 704, Taiwan
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National Taiwan University Hospital
RECRUITINGTaipei, 100, Taiwan
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NeuroCare Center
RECRUITINGCanton, Ohio, 44718, United States
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NeuroProtect
RECRUITINGWarsaw, 01-684, Poland
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Neurology Center of North Orange County
RECRUITINGFullerton, California, 92835, United States
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Ninewells Hospital, Dundee- Scotland
RECRUITINGDundee, DD2 1SY, United Kingdom
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Nmedis sp. z o.o.
RECRUITINGRzeszów, 35-232, Poland
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Northwestern University Feinberg School Of Medicine
RECRUITINGChicago, Illinois, 60611, United States
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Núcleo de Pesquisa do Rio Grande do Sul
RECRUITINGPorto Alegre, Rio Grande do Sul, 90430-001, Brazil
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Oregon Health and Science University
RECRUITINGPortland, Oregon, 97239, United States
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Ospedale Bellaria
RECRUITINGBologna, Emilia-Romagna, 40139, Italy
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Oxford University Hospitals NHS Foundation Trust
RECRUITINGOxford, OX3 7LE, United Kingdom
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Paracelsus Elena Klinik Kassel
RECRUITINGKassel, 34128, Germany
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Parkinson's Disease and Movement Disorders Center of Boca Raton
RECRUITINGBoca Raton, Florida, 33486, United States
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Parkinson's Research Centers of America - Long Island
RECRUITINGCommack, New York, 11725, United States
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Parkinson?s Research Centers of America ? Palo Alto
RECRUITINGPalo Alto, California, 94301, United States
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Perron Institute for Neurological and Translational Science
RECRUITINGNedlands, Western Australia, 6009, Australia
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Plymouth Hospitals NHS Trust - Derriford Hospital
RECRUITINGPlymouth,Devon, PL6 8DH, United Kingdom
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Podlaskie Centrum Psychogeriatrii
WITHDRAWNBia?ystok, 15-756, Poland
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Policlinica Guipuzcoa
RECRUITINGDonostia / San Sebastian, Guipuzcoa, 20009, Spain
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Policlinico Universitario Agostino Gemelli
RECRUITINGRome, Lazio, 00168, Italy
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Princess Alexandra Hospital
RECRUITINGWoolloongabba, Queensland, 4102, Australia
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Profound Research LLC at The Neurology Center of Southern California
RECRUITINGPasadena, California, 91105, United States
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Quest Research Institute
RECRUITINGFarmington Hills, Michigan, 48334, United States
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Regionshospitalet Gødstrup;Neurologisk Afdeling
RECRUITINGHerning, 7400, Denmark
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Renji Hospital Affiliated to Shanghai Jiao Tong University School of Medicine
RECRUITINGShanghai, 200127, China
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Renown Health
RECRUITINGReno, Nevada, 89502, United States
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Rocky Mountain Movement Disorders
RECRUITINGEnglewood, Colorado, 80113, United States
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Royal Devon and Exeter Hospital (Wonford)
RECRUITINGExeter, EX2 5DW, United Kingdom
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Royal London Hospital
RECRUITINGLondon, E1 1FR, United Kingdom
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Royal Melbourne Hospital
RECRUITINGParkville, Victoria, 3050, Australia
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Ruijin Hospital Shanghai Jiaotong University School of Medicine
RECRUITINGShanghai, 200025, China
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Samsung Medical Center
RECRUITINGSeoul, 06351, South Korea
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San Raffaele Cassino
RECRUITINGCassino, Lazio, 03043, Italy
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Santa Casa de Misericordia de Salvador
RECRUITINGSalvador, Estado de Bahia, 40050-410, Brazil
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Seoul National University Hospital
RECRUITINGSeoul, 110-744, South Korea
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Severance Hospital, Yonsei University Health System
RECRUITINGSeoul, 03722, South Korea
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Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University
RECRUITINGHangzhou, China
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Southern Neurology
RECRUITINGKogarah, New South Wales, 2217, Australia
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St. Josef-Hospital, Klinik für Neurologie
RECRUITINGBochum, 44791, Germany
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Stanford Neuroscience Health Center (SNHC)
RECRUITINGStanford, California, 94304, United States
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Szpital Sw. Wojciecha
RECRUITINGGda?sk, 80-462, Poland
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Taipei Veterans General Hospital
RECRUITINGTaipei, 11217, Taiwan
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Texas Neurology PA
RECRUITINGDallas, Texas, 75206, United States
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The Affiliated Hospital of Xuzhou Medical University
RECRUITINGXuzhou, China
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The Alfred Hospital
RECRUITINGPrahan, Victoria, 3181, Australia
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The First Affiliated Hospital of Guangzhou Medical University
RECRUITINGGuangzhou, 510120, China
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The First Affiliated Hospital of Sun Yat-sen University
RECRUITINGGuangzhou, 510080, China
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The First Affiliated Hospital, Chongqing Medical University
RECRUITINGChongqing, 400016, China
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The First Hospital of Jilin University
RECRUITINGChangchun, 130021, China
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The Movement Disorder Clinic of Oklahoma
RECRUITINGTulsa, Oklahoma, 74136, United States
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The Second Affiliated Hospital of Soochow University
RECRUITINGSuzhou, 215004, China
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The Second Affiliated Hospital of Zhejiang University School of Medicine
RECRUITINGHangzhou, 310009, China
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Tianjin Medical University General Hospital
RECRUITINGTianjin, 300052, China
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UC San Diego
RECRUITINGLa Jolla, California, 92037, United States
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UCLA Neurology Outpatient Clinic
RECRUITINGLos Angeles, California, 90095, United States
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UCSF Weill Institute for Neurosciences
RECRUITINGSan Francisco, California, 94158, United States
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USF Parkinsons Disease and Movement Disorders Center
RECRUITINGTampa, Florida, 33613, United States
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Uniklinik fuer Neurologie, Medizinische Universitaet Innsbruck
RECRUITINGInnsbruck, 6020, Austria
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Universitaettsklinikum Tübingen
RECRUITINGTübingen, 72076, Germany
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Universitatsklinikum Munster
RECRUITINGMünster, 48149, Germany
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University Health Network
RECRUITINGToronto, Ontario, M5G 2C4, Canada
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University Pennsylvania Hospital
RECRUITINGPhiladelphia, Pennsylvania, 19107, United States
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University of Alabama at Birmingham
RECRUITINGBirmingham, Alabama, 35233, United States
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University of Kansas Medical Center
RECRUITINGKansas City, Kansas, 66160, United States
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University of New Mexico
RECRUITINGAlbuquerque, New Mexico, 87106, United States
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University of Vermont Medical Center
RECRUITINGBurlington, Vermont, 05401, United States
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University of Virginia Health System
RECRUITINGCharlottesville, Virginia, 22903, United States
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Università degli studi della Campania Luigi Vanvitelli
RECRUITINGNaples, Campania, 80138, Italy
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Universität Des Saarlandes
RECRUITINGHomburg, 66421, Germany
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Universitätsklinikum "Carl Gustav Carus"
RECRUITINGDresden, 01307, Germany
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Universitätsklinikum Erlangen, Abteilung Molekulare Neurologie
RECRUITINGErlangen, 91054, Germany
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Universitätsklinikum Freiburg, Klinik für Neurologie und Neurophysiologie
RECRUITINGFreiburg im Breisgau, 79106, Germany
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Universitätsklinikum Heidelberg, Neurologische Klinik, Abteilung für Neuroradiologie
RECRUITINGHeidelberg, 69120, Germany
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Universitätsklinikum Würzburg, Neurologische Klinik und Poliklinik
RECRUITINGWürzburg, 97080, Germany
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VCU Health North Hospital
RECRUITINGRichmond, Virginia, 23298, United States
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Vanderbilt University Medical Center
RECRUITINGNashville, Tennessee, 37212, United States
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Veracity Neuroscience
RECRUITINGMemphis, Tennessee, 38157, United States
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Washington Uni School of Medicine
RECRUITINGSt Louis, Missouri, 63110, United States
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Weill Cornell Medical College
RECRUITINGNew York, New York, 10021, United States
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West China Hospital of Sichuan University
RECRUITINGChengdu, 610041, China
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West Virginia University
RECRUITINGMorgantown, West Virginia, 26506, United States
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Westmead Hospital
RECRUITINGWestmead, New South Wales, 2145, Australia
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Xuanwu Hospital, Capital Medical University
RECRUITINGBeijing, 100053, China
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