ClinicalTrials.gg
CompletedNCT03421899SysMedPDUpdated May 23, 2023

A Study Into the Underlying Biochemical Pathways Involved in Parkinson's Disease, Such as Mitochondrial (Cellular "Powerhouse") Dysfunction

An observational study in Parkinson Disease and Parkinsonism, sponsored by University College, London. Completed at 1 site in United Kingdom. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2023-05-23.

Sponsored by University College, London · Observational

Study type
Observational
Model
Other
Time perspective
Prospective
Enrollment
160
Ages
18 Years and older
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-12

Among 16 studies in Parkinson Disease by University College, London — 4 open to participants now, 4 under way, 2 of them phase 3. Parkinson Disease · University College, London.

Started
2017
the only one that year
Observational
4 of 16
2 open now
Registered
9th of 16
by date

Among the 16 studies in Parkinson Disease by University College, London, this one is the only one that started in 2017, is one of 4 observational ones, and was the 9th registered.

Parkinson Disease

4,576 studies on the registry are indexed under Parkinson Disease; 1,087 are open to participants now.

Browse Parkinson Disease studies →

Open to participants now

4 of the 16 studies in Parkinson Disease by University College, London are open now, in 1 country. Recruiting first, the newest first:

By country, each count listing its studies:

All 4 open studies →

Who these studies take

Of the 749 Parkinson Disease studies recruiting now, 311 (42%) set no upper age limit and 127 (17%) stop at 75 or younger; 64 take children under 18; 189 take healthy volunteers.

This study: 18 Years and older · all sexes · healthy volunteers too.

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02

Study summary

Parkinson's disease (PD) is a progressive neurological disorder that is increasingly common with age, with the incidence rising from approximately 4 people per 10,000 in their forties to 2 in 100 over the age of eighty.

Our understanding of the causes of PD has rapidly developed in the past two decades, but this has not yet translated into any clinically established neuroprotective treatment that slows disease progression. There is a growing consensus that the failure of previous efforts is mainly due to the causative diversity of PD i.e. that PD may have many different causes. For example, it is known that variants in mitochondrial (cellular power house) genes can cause specific forms of PD and this may be relevant to other forms of PD.

The aim of this study is to attempt to group PD patients based on markers of biochemical dysfunction (e.g. into groups of patients that do and those who do not have evidence of mitochondrial dysfunction) to aid in the development of new candidate neuro-protective compounds.

The investigators hope by grouping people with Parkinson's into those with and without impaired mitochondrial function the investigators will be better able to develop more targeted treatments aimed at protecting further loss of brain cells that occurs in Parkinson's disease.

To achieve this the investigators will study people, in two study sites in London, with both genetic forms of PD and those with idiopathic PD (i.e. those where there is not a known genetic variant causing PD), as well as a healthy control group. All groups will undergo standardised clinical assessment to collect information on several aspects of their condition (e.g. disease severity, memory problems and sleep problems).

Participants will be asked to provide blood, urine and optionally cerebrospinal fluid \& skin samples from which various biochemical assays and genetic analysis will be performed in attempt to group participants based on the results of these tests. The study is funded for 3 years with participants being asked to attend for up to 3 study visits each over this time period.

Read the detailed description

Parkinson's disease (PD) is a progressive neurological disorder that is increasingly prevalent with age, with the incidence rising from approximately 4 people per 10,000 in their forties to 2 in 100 over the age of eighty. Besides motor symptoms, such as tremor, rigidity, bradykinesia, and postural instability, PD patients often experience a variety of non-motor symptoms, such as fatigue, depression, sleep disturbance, and dementia.

Although symptomatic treatments exist to partially compensate for motor dysfunction, no neuroprotective treatment has yet been established to slow PD progression, which inevitably renders patients incapable of living independently. Compared to age- and sex-matched controls, PD patients are about 5 times more likely to require nursing home care and this care costs about 5 times more than average nursing home care. This, combined with the European demographic shift toward an increasingly larger fraction of aged individuals, creates a social and economic challenge to develop new medications to slow the progression of PD.

Our understanding of the aetiopathogenesis of PD has rapidly developed in the past two decades, but this has not yet translated into any clinically established neuroprotective treatment that slows disease progression. There is a growing consensus that the failure of previous efforts is mainly due to the aetiopathogenic diversity of PD and the estrangement of existing preclinical models from clinical PD. For example, it is known that mutations in mitochondrial genes can cause monogenic PD and biochemical evidence indicates that in a proportion of cases, idiopathic PD is associated with detectable mitochondrial dysfunction.

Therefore, the investigators focus is on monogenic forms of PD that involve mitochondrial abnormalities as a primary (e.g., Parkin, PINK1), or secondary (e.g., LRRK2, GBA1) phenomenon, in order to extrapolate to idiopathic PD (IPD) patients with and without mitochondrial dysfunction (Mito-IPD and Amito-IPD, respectively). Biochemical pathways focusing on, but not restricted to mitochondrial function, will be assessed using a variety of techniques including biochemical assays on blood, urine, CSF and tissue samples. The investigators will explore both the relevance and measurement of specific biochemical pathways in Parkinson's and related disorders

The main overall objective is to stratify PD patients based on dysfunction in biochemical pathways related to PD. This will aid in developing new candidate neuroprotection compounds to slow the progression of neurodegeneration.

03

Conditions studied

  • Parkinson Disease
  • Parkinsonism

Keywords

  • Mitochondria
  • Mitochondrial dysfunction
  • Parkin
  • PINK1
04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Probability sample

Study population

The study population will comprise of people with PD (those with and without know genetic mutations associated with PD) as well as an age matched control population.

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. Diagnosed with PD, or a related condition (e.g. Parkinson's plus, dystonia, tremor) or healthy control participant
  2. Age 18 years or over

Exclusion criteria

Exclusion Criteria:

  1. Lack of capacity to consent to participate in the project
05

Study design

Observational model
Other
Time perspective
Prospective
Enrollment
160 participants (actual)
Patient registry
No
Biospecimen retention
Samples with dna

Groups and cohorts

  • Genetic Parkinson's group

    Those participants with Parkinson's disease and a genetic mutation known to cause or increase risk of Parkinson's disease (e.g. Parkin, PINK1, GBA or LRRK2)

  • Idiopathic Parkinson's group

    Those participants with Parkinson's disease but without a known genetic mutation known to cause or increase risk of Parkinson's disease

  • Healthy control group

    Those participants unaffected by Parkinson's disease

06

What researchers measure

Primary outcomes

  1. Definition of a reproducible biochemical method of grouping people with Parkinson's based on defined biochemical dysfunction

    The study will primarily aim to stratify patients by the degree of mitochondrial dysfunction detected by a battery of functional assays.

    Time frame: 3 years

07

Study locations

1 site
  • UCL Institute of Neurology, Department of Clinical Neurosciences, Upper 3rd Floor, Royal Free Hospital, Rowland Hill Street
    London, NW3 2PF, United Kingdom
08

References and documents

Study documents

PDFs hosted by the registry, ClinicalTrials.gov.

Individual participant data

Plan to share: No

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Ran from Aug 2017 to primary completion in Apr 2020, 31 months.

Of 379 non-industry observational studies under Parkinson Disease, half reached primary completion within 48 months of starting (the median), counting those still running; a quarter within 22 and three quarters within 133. This study's 31 months is below that.

Counting every sponsor, half of 439 studies reached it within 47 months; a quarter within 22 and three quarters within 114.

How these figures are worked out, and which studies are left out of them.

Registered
Nov 23, 2017
First posted
Feb 5, 2018
StartActual
Aug 18, 2017
Primary completionActual
Apr 1, 2020
CompletionActual
Apr 1, 2020
Last update
May 23, 2023
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on May 23, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT03421899
Collaborators
European Commission, University of Luxembourg, University of Luebeck, Leiden University Medical Center
Responsible party
Sponsor
First posted
Feb 5, 2018
Start date
Aug 18, 2017
Primary completion
Apr 1, 2020
Completion
Apr 1, 2020
Last update
May 23, 2023

Study contacts

Tony Schapira
principal investigator · UCL Institute of Neurology
Huw Morris
principal investigator · UCL Institute of Neurology

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in May 2023. You cannot join it, but the record below documents what was studied.

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