A US Study That Observes How Parkinson's Disease Changes Over Time in Patients Who Still Have Movement Symptoms Despite Taking Parkinson's Medications

NCT ID: NCT07330258

Last Updated: 2026-02-03

Basic Information

• Recruitment Status: NOT_YET_RECRUITING
• Total Enrollment: 300 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2026-01-31
• Study Completion Date: 2033-06-01

Brief Summary

This is an observational study in which data are collected and studied from Parkinson's disease patients who have movement symptoms despite taking standard Parkinson's medications. In observational studies, observations are made without any changes to the participant's healthcare or treatment plan. No investigational product will be administered in this study, as participants will be treated with the standard of care that medical experts currently consider most appropriate.

Parkinson's disease (PD) is a condition that affects the brain and causes problems with movement and other body functions. The symptoms of Parkinson's disease can worsen over time. People with Parkinson's disease may experience shaking (tremor), slow movements, stiff muscles, trouble walking, and problems with balance. They can also have other symptoms, such as difficulty thinking clearly, changes in mood, or difficulty sleeping. Parkinson's disease mostly affects older adults, but it can happen to younger people too. There is no cure, but treatments can help manage the symptoms and improve quality of life.

While doctors and researchers know that Parkinson's disease affects people in different ways and can worsen over time, there are still many things they don't fully understand-especially for people who experience movement symptoms despite taking their usual Parkinson's medicines. Earlier studies did not follow these patients long enough or collect all the important information needed. This study is being done to fill those gaps.

The main purpose of this study is to better understand how Parkinson's disease changes over time in patients who experience movement symptoms while taking standard oral Parkinson's medications, what challenges patients and their care partners face, and how their treatments are working in real life. To do this, researchers will collect data on:

• Sociodemographics (e.g. age, gender, race/ethnicity, insurance provider).
• Medical history and vital signs (e.g. comorbidities, family history of Parkinson's, height, weight, blood pressure).
• Medications and treatments (e.g. Parkinson's and non-Parkinson's medications and other treatments, rehabilitation therapy sessions, use of mobility assistance devices).
• Movement symptoms (e.g. tremor, slow movement, balance).
• Non-movement symptoms (e.g. cognition, mood, sleep, activities of daily living).
• Molecular data (e.g. genetics, α-synuclein).
• Burden of care (e.g. economic cost).

Data will come from questionnaires or rating scales conducted by the doctor with the patient during study visits, diaries and logs completed by the patient, medical records, health insurance claims records, blood samples and skin biopsies, a digital device that records movement/non-movement symptoms, and questionnaires completed by the care partner.

Data will be collected from December 2025 to December 2032. Each participant may be followed for up to 5 years.

Conditions

Parkinson's Disease

Study Design

• Observational Model Type: COHORT
• Study Time Perspective: PROSPECTIVE

Study Groups

Parkinson's Disease Cohort

A single cohort of patients with Parkinson's disease experiencing motor complications while receiving standard-of-care oral therapies. The care partner of the patient may also participate in the study.

Standard of Care

Intervention Type: OTHER

Follow clinical practice/administration. No investigational products will be administered in this study. Patients will be treated in accordance with standard of care as determined by their clinician.

Care Partners Cohort

The care partner of the patient may also participate in the study.

No interventions assigned to this group

Interventions

Standard of Care

Follow clinical practice/administration. No investigational products will be administered in this study. Patients will be treated in accordance with standard of care as determined by their clinician.

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Individual of any sex ≥45 to ≤75 years of age at informed consent (at least 30% ≤60 years of age).
• Diagnosis of clinically established Parkinson's disease (PD) as defined by the Movement Disorder Society (MDS) Clinical Diagnostic Criteria for PD ≥4 and <12 years from time of PD diagnosis at informed consent.
• Modified H&Y stage II-III in the practically defined OFF-medication state (≥12 hours from last dose of antiparkinsonian medications).
• Score of ≥30 on MDS-Unified Parkinson's Disease Rating Scale (MDS-UPDRS) part III in the OFF-medication state.
• Presence of motor fluctuations with ≥1 hour of absolute time in the OFF state per day as assessed by clinician/patient at screening.
• Receiving stable antiparkinsonian medication regimen for ≥4 weeks prior to screening with a levodopa daily dose ≥300 mg or a dosing frequency of ≥3 times per day.
• Responsiveness to levodopa as determined by change in the following measures from the practically defined OFF state to ON state after taking typical first-daily dose of PD-medications: i. any degree of improvement (≥0.5 point) in modified H&Y stage OR. ii. ≥30% improvement in MDS-UPDRS part III score.
• Montreal Cognitive Assessment (MoCA) score of ≥24.
• Agree to participate and provide signed informed consent.

• ≥18 years of age at informed consent.
• Identified by the PD patient as their primary care partner.
• Agree to participate and the ability to provide signed informed consent independently, without the need for a legal representative.

Exclusion Criteria

• Known history or presence of conditions that may provide an alternative to a PD diagnosis including but not limited to: multiple system atrophy, progressive supranuclear palsy, striatonigral degeneration, corticobasal syndrome/degeneration, vascular Parkinsonism, drug-induced Parkinsonism, essential tremor, diffuse Lewy body disease, Lewy body dementia, Huntington's disease, Wilson's disease, Fahr's disease, Alzheimer's disease, cerebrovascular disease, brain tumor, trauma, and infection.
• Known history or presence of significant vascular and/or cardiovascular disease limited to: stroke, transient ischemic attacks, poorly controlled hypertension, poorly controlled diabetes, unstable angina pectoris, or unstable myocardial infarction.
• Known history or presence of significant psychosis or impulse control disorder, or untreated or sub optimally treated depression.
• Known history or presence of human immunodeficiency virus, hepatitis B virus, hepatitis C virus, syphilis, or tuberculosis.
• Current or previously active malignant disease within the past 5 years, except definitively treated cutaneous squamous cell carcinoma, basal cell carcinoma, or in situ uterine cervical carcinoma.
• Currently pregnant, nursing, lactating, breastfeeding, or plan to be during study duration.
• Known history or current use of percutaneous levodopa/carbidopa intestinal gel, subcutaneous levodopa, or apomorphine pump.
• Prior history of brain surgery, including but not limited to: deep brain stimulation (DBS), pallidotomy, focused ultrasound thalamotomy, or other experimental neurosurgical procedure.
• Known history or current participation in cell or gene therapy procedures.
• Current participation in any interventional clinical trial.

• Not applicable.

• Minimum Eligible Age: 45 Years
• Maximum Eligible Age: 75 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Bayer

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

The Parkinson's & Movement Disorder Institute

Fountain Valley, California, United States

Keck School of Medicine

Los Angeles, California, United States

Boston University

Boston, Massachusetts, United States

University of Texas Health Science Center at Houston

Houston, Texas, United States

University of Vermont

Burlington, Vermont, United States

Countries

United States

Central Contacts

Bayer Clinical Trials Contact

Role: CONTACT

clinical-trials-contact@bayer.com

(+)1-888-84 22937

Related Links

https://clinicaltrials.bayer.com/

Click here for access to information about Bayer's transparency standards and Bayer studies.

Other Identifiers

23021

Identifier Type: -

Identifier Source: org_study_id