Amyloid Monoclonal Antibody Treatment in PD Patients With Coexistent AD Pathology

April 15, 2026 updated by: Yonsei University

Efficacy of Lecanemab in Patients With Parkinson's Disease With Coexistent Alzheimer's Disease

This study aimed to determine the efficacy of amyloid clearance of lecanemab in patients with Parkinson's disease (PD) with amyloid co-pathology. Lecanemab, an anti-amyloid monoclonal antibody, was apporoved by the US FDA in July 2023 and in South Korea in May 2024, as a disease-modifying therapy based on its clinical efficacy and reduction of amyloid plaques in patients with early-stage Alzheimer's disease (AD). AD pathology is also common in PD, and approximately 35% of patients with PD dementia have co-existing AD pathology. Currently, no mediations have been developed to slow the progression of PD. Therefore, this study aimed to determine whether reducing the amyloid burden in patients with PD with co-exsistent AD pathology could potentially slow disease progression. To test it, patients with PD with mild cognitive impairment or early dementia, who were confirmed to have amyloid deposition through amyloid imaging, would be enrolled as a treatment arm, and the degree of reduction of amyloid plaque after 18 months of lecanemab administration would be investigated.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This study plans to consecutively enroll the patients with Parkinson's disease (PD) who have confirmed amyloid deposition on amyloid imaging and meet the indications for lecanemab administration. After a thorough explanation of lecanemab administration, patients who consent to the treatment would be enrolled. Patients assinged to the treatment arm would receive standard lecanemab treatment (10mg/kg intravenous infusion every two weeks for 18 months) and standard PD care. Patients who do not consent to the administration of lecanemab would receive stadnard care for PD and be monitored their progress without any further intervention.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
60

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.
  • Name: Phil Hyu Lee, MD
  • Phone Number: 82-2-2228-1608
  • Email: phlee@yuhs.ac

Study Locations

  • South Korea
      • Seoul, South Korea
        • Yonsei University College of Medicine
        • Contact:
          • Phil Hyu Lee, MD
          • Phone Number: +82-2-2228-1608
          • Email: phlee@yuhs.ac

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Patients diagnosed with Parkinson's disease
  2. Amyloid deposition confirmed by FBB PET
  3. Mild cognitive impairment or early dementia (CDR 0.5 or 1) on neuropsychological tests
  4. Adults aged 50-90 years

Exclusion Criteria:

  1. Cases in which lecanemab administration is contraindicated (based on recommendations from the Korean Dementia Association)
  2. Cases in which neuropathologies other than Parkinson's disease or Alzheimer's disease are suspected as the underlying disease

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Lecanemab admnistration group
Patients who receive lecanemab 10mg/kg every two weeks for 18 months
Drug: Lecanemab
Patients assigned to this arm receive lecanemab 10mg/kg intravenously every two weeks for 18 months.
Active Comparator: Lecanemab non-admnistration group
Patients who do not receive lecanemab
Other: Lecanemab non-administration group
Patients assigned to this arm do not receive lecanemab 10mg/kg intravenously during the follow-up period

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Changes in amyloid dposition on amyloid imaging scans
Time Frame: Change from baseline to 18 months
Changes in amyloid dposition (i.e., global FBB SUVR) on amyloid imaging scans (18F-FBB PET) after lecanemab administration in the lecanemab adminstration group
Change from baseline to 18 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
longitudinal changes in the MMSE score
Time Frame: Change from baseline to 18 months
The change in Mini-Mental State Examination (MMSE) score from baseline to 18 months will be compared between the lecanemab administration group and the non-administration group.
Change from baseline to 18 months
longituidnal changes in UPDRS-III scores.
Time Frame: Change from baseline to 18 months
The change in Unified Parkinson's Disease Rating Scale Part III (UPDRS-III) score from baseline to 18 months will be compared between the lecanemab administration group and the non-administration group.
Change from baseline to 18 months
Longitudinal changes in the plasma and cerebrospinal fluid biomarkers
Time Frame: Change from baseline to 18 months
Longitudinal changes in the plasma and cerebrospinal fluid biomarkers regarding the Alzheimer's disease in the lecanemab administration group.
Change from baseline to 18 months
longitudinal changes in the MoCA score.
Time Frame: Change from baseline to 18 months
The change in Montreal Cognitive Assessment (MoCA) score from baseline to 18 months will be compared between the lecanemab administration group and the non-administration group.
Change from baseline to 18 months
longitudinal changes in CDR-SB.
Time Frame: Change from baseline to 18 months
The change in Clinical Dementia Rating-Sum of Boxes (CDR-SB) score from baseline to 18 months will be compared between the lecanemab administration group and the non-administration group.
Change from baseline to 18 months
longituidnal changes in composite scores of each cognitive domain.
Time Frame: Change from baseline to 18 months
The change in composite scores of cognitive domains from baseline to 18 months will be compared between the lecanemab administration group and the non-administration group.
Change from baseline to 18 months
longituidnal changes in levodopa-equivalent doses per body weight [mg/kg].
Time Frame: Change from baseline to 18 months
The change in levodopa-equivalent dose (LED) from baseline to 18 months will be compared between the lecanemab administration group and the non-administration group.
Change from baseline to 18 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Yonsei University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
May 1, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 1, 2030

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
November 1, 2030

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
December 21, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 15, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
April 22, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
April 22, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 15, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
April 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 4-2025-1358

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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