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Patients With SynucleinopathiesNCT01799915

Natural History Study of Synucleinopathies

An observational study of Patients With Synucleinopathies and Neurogenic Orthostatic Hypotension, run by NYU Langone Health at 8 sites in 4 countries.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

Synucleinopathies are a group of rare diseases associated with worsening neurological deficits and the abnormal accumulation of the protein α-synuclein in the nervous system. Onset is usually in late adulthood at age 50 or older. Read more about this study

Who is it for?
Ages 18 years and older
How many people
800 participants
Where
8 sitesin 4 countries
Study dates
Jun 2011to 30 Dec 2026
Phase
Observational
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Study population: Primary autonomic disorders are a group of diseases that usually begin in adulthood with the inability to stand because of dizziness, lightheadedness and fainting. Symptoms are the result of a dysfunction in the autonomic nerves that regulate blood pressure and heart rate, and are either related to the accumulation of abnormal protein deposits and a primary neurodegenerative process (like Parkinson's disease, pure autonomic failure, dementia with Lewy bodies and multiple system atrophy), secondary to genetic abnormalities (dopamine-beta-hydroxylase deficiency), an autoimmune process (autoimmune ganglionopathy), or because of a direct injury to the nerves involved in buffering blood pressure fluctuations (acquired baroreflex failure).

Who may be able to join

  • Both male and female patients will be included
  • Aged 18 or over
  • Referred to any of the participating consortium sites with orthostatic intolerance, defined as symptoms of dizziness or lightheadedness in the standing position that disappear when supine.

Who cannot join

  • Diabetes according to the American Diabetes Association criteria
  • Congestive heart failure
  • Lupus or other collagen vascular disease
  • Systemic illness thought to be responsible for the orthostatic intolerance
  • Drug-induced orthostatic hypotension (i.e., the use of alpha-blockers, diuretics, tricyclic antidepressants or others thought by the investigator to play an important role in the patient's orthostatic hypotension)
  • Isolated vasovagal syncope
  • Inability to comply with the protocol, e.g. uncooperative attitude, inability to return for follow-up visits, and unlikelihood of completing the study.

Trial locations and contacts

8 sites in 4 countries. Contact the study team or a site near you to ask about taking part.

8 sites in 4 countries

United States5 sites, 5 recruiting
  • University of Michigan

    Ann Arbor, Michigan

    Arijit Bhaumik, BA, 734 936 8281, arijit@umich.edu

    Recruiting
  • Beth Israel Deaconess Medical Center

    Boston, Massachusetts

    Sharika Rajan, 617 632 0864, srajan@bidmc.harvard.edu

    Recruiting
  • Vanderbilt Univeristy

    Nashville, Tennessee

    Emily Garland, PhD, 615 936 1748, emily.garland@Vanderbilt.Edu

    Recruiting
  • NYU Medical Center

    New York, New York, 10016

    Jose Martinez, MA, 212 263 7225, jose.martinez@nyumc.org

    Horacio Kaufmann, MD

    Recruiting
  • Mayo Clinic

    Rochester, Minnesota

    Tonette Gehrking, 507 284 0336, adc.research@mayo.edu

    Recruiting

Other trials in United States

Argentina1 site, 1 recruiting
  • FLENI - Fundación para la Lucha contras las Enfermedades Neurológicas

    Buenos Aires

    Malco Rossi, mrossi@fleni.org.ar

    Marcelo Merello, MD

    Recruiting

Other trials in Argentina

South Korea1 site, 1 recruiting
  • Seoul National University Hospital

    Seoul

    Han-Joon Kim, MD, movement.snuh@gamil.com

    Han-Joon Kim, MD

    Recruiting

Other trials in South Korea

Spain1 site, 1 recruiting
  • BioCruces Research Institute - Hospital Universitario de Cruces

    Bilbao

    Juan Carlos Gomez-Esteban, MD, JUANCARLOS.GOMEZESTEBAN@osakidetza.eus

    Juan Carlos Gomez-Esteban, MD

    Recruiting

Other trials in Spain

About this study

Synucleinopathies are a group of rare diseases associated with worsening neurological deficits and the abnormal accumulation of the protein α-synuclein in the nervous system. Onset is usually in late adulthood at age 50 or older. Usually, synucleinopathies present clinically with slowness of movement, coordination difficulties or mild cognitive impairment. Development of these features indicates that abnormal alpha-synuclein deposits have destroyed key areas of the brain involved in the control of movement or cognition. Patients with synucleinopathies and signs of CNS-deficits are frequently diagnosed with Parkinson disease (PD), dementia with Lewy bodies (DLB) or multiple system atrophy (MSA).

However, accumulation of alpha-synuclein and death of nerve cells can also begin outside the brain in the autonomic nerves. In such cases, syncucleinopathies present first with symptoms of autonomic impairment (unexplained constipation, urinary difficulties, and sexual dysfunction). In rare cases, hypotension on standing (a disorder known as orthostatic hypotension) may be the only clinical finding. This "pre-motor" autonomic stage suggests that the disease process may not yet have spread to the brain.

Read more

After a variable period of time, but usually within 5-years, most patients with abnormally low blood pressure on standing develop cognitive or motor abnormalities. This stepwise evolution indicates that the disease spreads from the body to the brain. Another indication of this spread is that acting out dreams (i.e., REM sleep behavior disorder, RBD) a problem that occurs when the lower part of the brain is affected, may also be the first noticeable sign of Parkinson disease.

The purpose of this study is to document the clinical features and biological markers of patients with synucleinopathies and better understand how these disorders evolve over time. The study will involve following patients diagnosed with a synucleinopathy (PD/DLB and MSA) and those believed to be in the "pre-motor" stage (with isolated autonomic impairment and/or RBD). Through a careful series of follow-up visits to participating Centers, we will focus on finding biological clues that predict which patients will develop motor/cognitive problems and which ones have the resilience to keep the disease at bay preventing spread to the brain. We will also define the natural history of MSA - the most aggressive of the synucleinopathies.

Read the detailed description

α-synuclein is a small protein of 140 amino acids that is highly expressed in the brain. It's function remains poorly understood.10 Synucleinopathies are a group of neurodegenerative diseases associated with the abnormal accumulation of α-synuclein within cytoplasmic inclusions in neurons or oligodendroglia. These α-synuclein containing cytoplasmic aggregates occur throughout the brain, producing cell death and specific motor, autonomic and cognitive dysfunction in four phenotypically distinct synucleinopathies. When α-synuclein deposition occurs in neurons it aggregates into Lewy bodies, producing Parkinson disease (PD), dementia with Lewy bodies (DLB) or pure autonomic failure (PAF). Whereas in multiple system atrophy (MSA) neuronal death probably occurs as a consequence of α-synuclein aggregation in oligodendroglia.

A characteristic feature of the synucleinopathies is that they can all begin with varying degrees of autonomic dysfunction as the sole clinical feature - implying an initial diagnosis of isolated (pure) autonomic failure 11. After a variable period of time, but usually less than 5 years, only a small number of patients remain with a pure autonomic failure phenotype, but careful follow-up is lacking 11. Most patients develop cognitive or motor abnormalities (or both) and the patient is then diagnosed with PD, DLB or MSA.

This stepwise clinical progression suggests that the neurodegenerative process can in rare cases remain confined to autonomic neurons12, but more frequently spreads to affect additional areas of the central nervous system (CNS). This unique feature of the synucleinopathies poses diagnostic challenges and potential therapeutic opportunities.

The challenges are first, to determine whether PAF is a distinct disease or is always a prodromal phase of PD, DLB or MSA and second, to discover biomarkers that predict spread to motor and cognitive neurons. Such biomarkers would allow testing of disease-modifying strategies to delay or stop the neurodegenerative process in the pre-motor or pre-dementia phase. Aim 2 will focus on defining the natural history of MSA, the most aggressive of the synucleinopathies. This prospective observational study will establish disease-specific milestones for use in future clinical trials.

Obstacles to identifying biomarkers predicting further CNS involvement are that most medical centers only see patients with synucleinopathies when they already have developed motor and cognitive involvement, and that PAF and MSA are rare disorders. In this context the Autonomic Disorders Consortium (ADC) within the Rare Diseases Clinical Research Network (RDCRN) of the National Institutes of Health (NIH) was created with the objective of providing a better understanding of the variability, progression, and natural history of neurodegenerative synucleinopathies. Continuing this observational study, and increasing its power by including additional academic centers from the U.S., South America, and Europe, will allow us to define the natural history of these diseases and establish the sensitivity and specificity of the proposed biomarkers.

Medical subject headings
Pure Autonomic Failure, REM Sleep Behavior Disorder, Parkinson Disease, Lewy Body Disease, Multiple System Atrophy

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

Study groups in NCT01799915
Study groupRoleWhat they receive
REM sleep behavior disorder, RBDPatients that have rapid eye movement sleep behavior disorder.
multiple system atrophyis a neurodegenerative disorder charaterized by abnormal alpha-synuclein deposition in the cytoplasm of oligodendroglial cells in the CNS, and typically sparing peripheral autonomic nerves.
Pure Autonomic failureA neurodegenerative disorder characterized by loss of peripheral noradrenergic fibers, with low levels of plasma norepinephine.
Parkinson diseaseA degenerative disorder of the central nervous system that leads to termors, difficulty walking, movement and coordination.
Dementia with Lewy bodiesA neurodegenerative disorder similar to PAF and PD with the accumulation of Alpha-synuclein in the CNS however DLB patients develop dementia.

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. To create a database of primary autonomic disorders that will serve as a phenotyping core.

    We will create an enrollment database of patients with primary autonomic disorders. All patients will have standardized phenotyping evaluations that will combine clinical, physiological and biochemical strategies to characterize complex autonomic phenotypes, both known and still undiscovered.

    Measured: 5 years

Secondary outcomes (1)
  1. To define the natural history of neurogenic orthostatic hypotension and identify predictive biomarkers of autonomic disorders

    We will map the natural history of primary autonomic failure and test the hypothesis that pure autonomic failure (PAF) is a neurodegenerative synucleinopathy that remains confined to the autonomic nervous system. We will also identify biomarkers that can distinguish patients with PAF from those with early (i.e., "pre-motor") MSA, PD, DLB or autonomic failure as a result of another disorder.

    Measured: 5 years

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted27 Feb 2013 (estimated)
  2. Study startJun 2011
  3. Primary completion30 Dec 2026 (estimated)
  4. Study completion30 Dec 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Observational
Observational model
Cohort
Time perspective
Prospective
Enrolment
800 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT01799915
Sponsor's protocol ID
08-1408
Status last verified
Jun 2026
First submitted
25 Feb 2013
Last updated
10 Jun 2026
Results posted
No
Data monitoring committee
Yes

Publications

  • Palma JA, Vernetti PM, Perez MA, Krismer F, Seppi K, Fanciulli A, Singer W, Low P, Biaggioni I, Norcliffe-Kaufmann L, Pellecchia MT, Marti MJ, Kim HJ, Merello M, Stankovic I, Poewe W, Betensky R, Wenning G, Kaufmann H. Limitations of the Unified Multiple System Atrophy Rating Scale as outcome measure for clinical trials and a roadmap for improvement. Clin Auton Res. 2021 Apr;31(2):157-164. doi: 10.1007/s10286-021-00782-w. Epub 2021 Feb 7.

    PubMed 33554315
  • Norcliffe-Kaufmann L, Kaufmann H, Palma JA, Shibao CA, Biaggioni I, Peltier AC, Singer W, Low PA, Goldstein DS, Gibbons CH, Freeman R, Robertson D; Autonomic Disorders Consortium. Orthostatic heart rate changes in patients with autonomic failure caused by neurodegenerative synucleinopathies. Ann Neurol. 2018 Mar;83(3):522-531. doi: 10.1002/ana.25170. Epub 2018 Mar 10.

    PubMed 29405350

Questions about this trial

What is this clinical trial studying?

An observational study of Patients With Synucleinopathies and Neurogenic Orthostatic Hypotension, run by NYU Langone Health at 8 sites in 4 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 3 inclusion and 7 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 10 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 8 sites in United States, Argentina, South Korea, Spain. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Horacio Kaufmann, MD (212-263-7225, horacio.kaufmann@nyulangone.org), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

To create a database of primary autonomic disorders that will serve as a phenotyping core. (time frame: 5 years). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT01799915, which also lists 2 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 10 Jun 2026.

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