A Pilot Clinical Trial With the Iron Chelator Deferiprone in Parkinson's Disease (DeferipronPD)

This study is currently recruiting participants. (see Contacts and Locations)
Verified October 2012 by Imperial College London
Sponsor:
Information provided by (Responsible Party):
Imperial College London
ClinicalTrials.gov Identifier:
NCT01539837
First received: February 22, 2012
Last updated: October 16, 2012
Last verified: October 2012
  Purpose

Parkinson's disease (PD) is a common neurodegenerative disease affecting movement. Although drug treatments for PD are available they only treat the symptoms of the disease, fail to halt neuronal loss, and are associated with long term side effects and loss of efficacy. There is a chronic need to develop neuroprotective therapies. Increased iron and oxidative stress have been heavily implicated in the neurodegenerative process in PD, hence removal of excess iron by iron chelation represents a potential drug target. Iron chelators are extensively utilised to treat peripheral iron overload disorders (e.g. thalassaemia) and recently the investigators have demonstrated iron chelators such as Deferiprone can enter the brain removing excess iron and are neuroprotective in PD animal models. Although good tolerability and efficacy to remove brain iron has also been shown in a pilot study with the iron chelators Deferiprone in young patients with Friedreich Ataxia, where iron accumulates in the dentate nucleus, no studies have been conducted in aged individuals affected by PD. Hence the aims of this study are 1) to assess whether Deferiprone is well tolerated in PD patients, 2) whether Deferiprone can remove the excess iron levels found in the brain area affected by PD, the substantia nigra, as assessed by Magnetic resonance imaging (MRI) and 3) whether Deferiprone has any direct effect on the clinical symptoms of PD. Three groups of 12 (total 36) early stage drug free PD patients will be treated with 20 or 30mg/kg/d Deferiprone or Placebo for 6 months. Over the 6 months patients will receive serial MRI scans, neurological examinations not only to assess PD symptoms but also psychological state, plus blood test to monitor for potential side effects. Positive results from this pilot will help support larger clinical trials to evaluate whether Deferiprone can slow down/halt PD.


Condition Intervention Phase
Parkinson's Disease
Drug: Deferiprone
Drug: Placebo
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Pilot Clinical Trial With the Iron Chelator Deferiprone in Parkinson's Disease

Resource links provided by NLM:


Further study details as provided by Imperial College London:

Primary Outcome Measures:
  • safety and efficacy [ Time Frame: 6 months ] [ Designated as safety issue: Yes ]
    To assess whether 6 month treatment with Deferiprone is well tolerated by PD patients and assess whether such treatment removes excess iron in the brain area affected in PD, the substantia nigra, as assessed by MRI.


Secondary Outcome Measures:
  • Disease modification [ Time Frame: 6 months ] [ Designated as safety issue: No ]
    Assess whether Deferiprone therapy directly affects the symptoms of Parkinson's disease or other brain function e.g.psychological well being, during the course of the 6 months trial period


Estimated Enrollment: 36
Study Start Date: February 2012
Estimated Study Completion Date: December 2013
Estimated Primary Completion Date: September 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Placebo Comparator: A-Placebo
Drug excipient
Drug: Placebo
Feriprox placebo administered orally at the same dosing volume as the 20mg/kg/day feriprox per day
Other Name: Feriprox placebo
Active Comparator: B-Dferiprone
20mg/kg/day deferiprone
Drug: Deferiprone
20mg/kg/d or 30mg/kg/d Deferiprone divided into two equal doses (morning and evening), every day for 6 months
Other Name: Ferriprox
Active Comparator: C-Deferiprone
30mg/kg/day Deferiprone
Drug: Deferiprone
20mg/kg/d or 30mg/kg/d Deferiprone divided into two equal doses (morning and evening), every day for 6 months
Other Name: Ferriprox

  Hide Detailed Description

Detailed Description:

1.1 BACKGROUND Parkinson's disease (PD) is a progressive neurodegenerative disorder that affects approximately 2% of the population aged over 60 years. The common clinical motor control features are tremor, bradykinesia, postural abnormality and rigidity. However, in many patients non-motor features such as cognitive decline, depression, autonomic disturbances also occur as the disease progresses. The principal pathology is the degeneration of the nigrostriatal dopaminergic system which plays a major role in movement control through the release of dopamine in the striatum. Current therapeutic approach focus on dopamine replacement strategies either through the dopamine precursor L-DOPA or the use of dopamine agonists, and/or the use of monoamine oxidase inhibitors or catecholamine transferase inhibitors which prevent the breakdown of dopamine or facilitate L-DOPA entry into the brain. However, such therapeutic approaches are associated with declining efficacy and long term complications e.g. dyskinesias. Additionally, such therapeutic approaches only treat the clinical symptoms of PD and due not protect the neurons against degeneration hence the disease continues to progress with the patient experiencing increasing disability. Hence there is a chronic need for the development of neuroprotective drugs which prevent further neuronal loss and thus prevent the progression of the disease.

1.2 RATIONALE FOR CURRENT STUDY Hypothesis: Increased iron and oxidative stress play a major role in the neurodegenerative process in PD and iron chelation therapy can be effective in removing excess iron from the brain and potentially slowing the neurodegenerative process.

Research question: Can iron chelation therapy with Deferiprone remove excess iron in the substantia nigra in PD patients without toxic side effects. What effect does Deferiprone therapy have on the severity of PD and other brain function e.g. cognition, depression etc.

Increased iron levels have been heavily implicated in the neurodegenerative process in PD. Although many of our cellular processes require iron, when in excessive amounts it can trigger the formation of toxic chemicals called free radicals, of which there is extensive evidence of their increased formation in the PD brain. Hence removal of excess iron by iron chelation (drugs which bind and detoxify iron) represents a potential drug target.

Iron chelators e.g. Deferiprone in doses around 100mg/kg/day, are extensively utilised to treat peripheral iron overload disorders such as beta thalassaemia, where the patients requires regular blood transfusions but iron accumulates in the body when the red blood cells are removed from the circulation. Iron chelation therapy in such patients is associated with minimal side effects with long term use. Recently, in animal models of brain iron overload, we have demonstrated iron chelators can enter the brain removing excess iron. Additionally, we have recently shown that iron chelation therapy protects neurons against toxins in animal models of PD.

In 2007 20 or 30mg/kg/day Deferiprone was used in a pilot clinical trial in Friedreich ataxia (FA)patients, to assess whether the drug was well tolerated, removed excess brain iron and improved the clinical symptoms of FA. FA occurs due to a gene defect leading iron accumulation in the mitochondria in the cerebellum, toxicity of which leads to ataxia or inability to control muscle movements. FA is diagnosed in young individuals (14-26 years of age) and has no clinical treatment. In this 6 months FA study Deferiprone at 20 or 30mg/kg/day was well tolerated by the patients and resulted in a reduction in brain iron, as indicated by MRI brain imaging, and led to a clinical improvement in patient symptoms. Whilst this represents the first clinical use of an iron chelator to treat a neurodegenerative disorder, the FA patients in this study were young (14-23 years old) hence we do not know how aged (average age 60years) individuals commonly affected by PD will respond to iron chelator treatment. Hence the first aim of this study is to conduct the first pilot clinical trial with an iron chelator in newly diagnosed PD patients to assess tolerability along with its ability to reduce iron content in the brain area affected in PD, the substantia nigra, as assessed by MRI.

A number of clinical trials have already been conducted in PD with potential neuroprotective drugs but their ability to slow the disease process has been controversial since these drugs have a direct effects on the symptoms of PD itself. Hence it is difficult to say whether the beneficial effects of the drugs are due the prevention of further neuronal loss thus slowing the disease or whether they improve the patient's ability to move directly. PD progresses in most patients fairly slowly, hence we don't expect to see detectable neuroprotection following 6 months Deferiprone treatment but it will allow us to assess whether Deferiprone therapy has any direct effects on PD symptoms. Hence the second aim of this study will be to examine whether iron chelation therapy has a direct effect on PD symptomology.

If this pilot study clearly demonstrates good tolerability of Deferiprone in PD patients whilst showing good removal of excess SN iron level yet having minimal direct effect on PD symptomology this data will form the basis of large funding application for a multicentre clinical trials to investigate whether long term Deferiprone treatment can slow/halt the progression of PD.

  Eligibility

Ages Eligible for Study:   50 Years to 75 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Clinical diagnosis of Parkinson's disease
  • disease duration less than 5 years
  • stable response to standard anti-Parkinson's medication for at least 6 weeks

Exclusion Criteria:

  • Other neurological conditions
  • Diabetes
  • Renal or liver disease
  • Blood disorders
  • Pregnancy or breast feeding
  • Conditions which cause immunocompromise e.g. episodes of neutropaenia or agranulocytosis, HIV etc
  • Prior history of hypersensitivity to Deferiprone or its excipient
  • Pacemaker
  • artificial heart valves
  • ever had surgery to the head
  • Metalic implants in the CNS e.g. cerebral aneurysm clips
  • history of metal entering the eye
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01539837

Contacts
Contact: Antonio Martin-Bastida, MBBS +442075946685 a.martin-bastida@imperial.ac.uk
Contact: Christina Kabba, BSc +442075946685 c.kabba@imperial.ac.uk

Locations
United Kingdom
Centre for Neuroscience, Imperial College London Recruiting
London, United Kingdom, W120NN
Contact: David T Dexter, PhD    +442075946665    d.dexter@imperial.ac.uk   
Principal Investigator: David T Dexter, PhD         
Sub-Investigator: Paola Piccini, MBBS, PhD         
Sub-Investigator: Ward Roberta, PhD         
Sub-Investigator: Rexford Newbold, PhD         
Sponsors and Collaborators
Imperial College London
Investigators
Principal Investigator: David T Dexter, PhD Imperial College London
  More Information

Publications:
Responsible Party: Imperial College London
ClinicalTrials.gov Identifier: NCT01539837     History of Changes
Other Study ID Numbers: ICL-11/SC/0101, 2011-001148-31, 11/SC/0101
Study First Received: February 22, 2012
Last Updated: October 16, 2012
Health Authority: United Kingdom: Medicines and Healthcare Products Regulatory Agency

Keywords provided by Imperial College London:
Parkinson's disease
Brain Iron
Iron chelation
Oxidative stress

Additional relevant MeSH terms:
Parkinson Disease
Parkinsonian Disorders
Basal Ganglia Diseases
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Movement Disorders
Neurodegenerative Diseases
Deferiprone
Iron Chelating Agents
Chelating Agents
Sequestering Agents
Molecular Mechanisms of Pharmacological Action
Pharmacologic Actions

ClinicalTrials.gov processed this record on September 30, 2014