Parkinson DiseaseBTINCT03929406
Brain Tissue Imprint
A study testing Brain Tissue Imprint in people with Parkinson Disease and Neurologic Disorder, run by University Hospital, Grenoble at 1 site in France.
Trial summary
This exploratory study aims to validate the collection and analysis of brain tissue imprints during the DBS by using a CE marked Medical Device in patients presenting one of the following five disorders: Parkinson's disease (PD), essential tremor (ET), dystonia (DYS), Obsessive compulsive disorder (OCD) and Tourette… Read more about this study
- Who is it for?
- Ages 18 to 80 years
- Conditions the study is for
- Parkinson Disease, Neurologic Disorder
- What is being tested?
- Brain Tissue Imprint
- Type of treatment
- Medical device
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 40 participants
- Where
- 1 siteFrance
- Study dates
- May 2019to 30 Apr 2021
- Phase
- Interventional
- Are there results?
- None posted in the registry
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 to 80 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Eligible patients for deep brain stimulation surgery
- Patients affiliated to social security or benefiting of a similar insurance scheme
- Patients having signed a consent to participate to the study
Who cannot join
- Patient not eligible for deep brain stimulation surgery
- Pregnant women or nursing mothers
- Persons deprived of liberty by judicial or administrative decision
- Persons unable to express their consent or legally protected
- Persons in period of disqualification for another interventional research
Trial locations and contacts
1 site in 1 country.
France1 site
Grenoble Hospital - CHUGA
Grenoble, Isere, 38043
Stéphan Chabardès, Pr, +33 4 76 76 75 59, SChabardes@chu-grenoble.fr
Dodji D'Almeida, +33 4 56 52 03 89, DDalmeida@chu-grenoble.fr
About this study
Official title: Stimulation cérébrale Profonde et Empreinte Tissulaire : Une Nouvelle stratégie Pour la Recherche Biologique in Vivo Dans la Maladie de Parkinson, Les TOC, la Dystonie, le Tremblement Essentiel et le Syndrome Gilles de la Tourette.
This exploratory study aims to validate the collection and analysis of brain tissue imprints during the DBS by using a CE marked Medical Device in patients presenting one of the following five disorders: Parkinson's disease (PD), essential tremor (ET), dystonia (DYS), Obsessive compulsive disorder (OCD) and Tourette Syndrome (TS).
The Brain Tissue Imprint project is focused on the DBS surgical procedure, which constitutes an appropriate method to collect brain tissue imprints by taking advantage of the direct and transitory contact at the extremity of the dilator with adjacent brain tissue. Indeed, during this step, micro-fragments of brain material spontaneously adhere to the dilator tip. It is this imprinting process that allows to collect what is defined as "brain tissue imprints. This approach is part of the standard surgical procedure of the SCP without major change or complications.
Read the detailed description
Deep brain stimulation (DBS) has become the standard functional neurosurgery treatment for drug resistant Parkinson's disease (PD) patients. It has also demonstrated its efficacy to treat various movement disorders as well as neurological and psychiatric disorders. The subthalamic nucleus (STN), the globus pallidus internal (GPi) or the ventral intermediate nucleus of the thalamus (VIM) are the major targets of DBS.
Access to pathological brain tissue in living PD patients or other neurological diseases is a key issue for the discovery of new therapeutic targets and the development of potential curative therapies. In this context, DBS offers a unique access to the pathological brain. In the standard surgical procedure, to prepare the way for the final electrode, the surgeon uses a dilator that is lowered gently through the cerebral parenchyma up to the target. It has been shown that during this step, brain tissue fragments adhere to the extremity of the dilator. However, the major drawback of the standard dilator lies in the fact that its end is in contact with several brain regions before reaching the targeted nucleus. Therefore, it is difficult to guarantee the origin of the collected tissue micro-fragments. In order to optimize the specificity of the harvested imprints, the investgator will use a dedicated CE marked medical device that consists of a guide tube and a stylet instead of the dilator used in DBS surgical procedure. The objective of this study is to validate brain tissue imprints collection in PD, ET, DYS, OCD and TS.
The BTI will be specifically collected from the targeted implantation site corresponding to the STN, the GPi and the VIM. Moreover, the tip of the electrode (and therefore the BTI) often reaches the substantia negra pars compacta (SNpc) because of its proximity with the STN. The ability to perform BTI in the SNpc is of highly interest since it is the structure containing the neurons that degenerate gradually and massively throughout the pathological process of Parkinson's disease.
- Conditions
- Parkinson Disease, Neurologic Disorder
- Being tested
- Brain Tissue Imprint
- Keywords
- Deep Brain Stimulation, Tissue harvesting, Molecular analysis - Proteomics
- Medical subject headings
- Parkinson Disease, Nervous System Diseases
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Brain Tissue ImprintDevice
Brain Tissue Imprint procedure (BTI) is performed during DBS surgery. Before the implantation of the electrode, the surgeon uses a dilator. It is a rigid stylet with a blunt end, intended to prepare the way for the final electrode. This dilator is lowered gently through the cerebral parenchyma up to the target then removed to be replaced by the electrode.
In our BTI study, the standard dilator used in DBS surgery will be replaced by a CE marked Medical Device. This brain imprint kit will be used for each hemisphere. The procedure is the following:
- The guide tube with the first stylet is set up to the target
- Withdrawal of the first stylet and insertion of the second stylet for one minute to have a spontaneous and adequate tissue adhesion
- Withdrawal of the guide tube containing the stylet. This last step will prevent contamination of the harvested material on the stylet during the removal.
| Study group | Role | What they receive |
|---|---|---|
| Brain Tissue Imprint | Experimental | Evaluation and validation of the samples collected during the brain tissue imprint procedure using a CE marked Medical Device in patients presenting one of the following five disorders: Parkinson's disease (PD), essential tremor (ET), dystonia (DYS), Obsessive compulsive disorder (OCD) and Tourette Syndrome (TS). Receives: Device: Brain Tissue Imprint |
What is being measured
The primary outcome is the main question the study is designed to answer.
Validation of the collection of brain tissue fragments on the BTI device during the DBS surgical procedure
Visual assessment of the presence or the absence of a tissue micro-fragment. The presence or absence of blood contamination will also be notified
Measured: The evaluation of the collection of brain tissue fragments will be performed in the surgery room when the BTI device is removed from the patient and inserted in the collection tube
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted26 Apr 2019
- Study startMay 2019 (estimated)
- Primary completion30 Apr 2021 (estimated)
- Study completion30 Apr 2021 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (15)Papers the sponsor has linked to this study.
- Other trials for Parkinson DiseaseStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Other
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 40 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University Hospital, Grenoble
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Stéphan Chabardès, Pr, Principal investigator, Grenoble Hospital - Service de Neurochirurgie, CHUGA
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03929406
- Sponsor's protocol ID
- 2018-A03001-54
- Acronym
- BTI
- Status last verified
- Mar 2019
- First submitted
- 9 Apr 2019
- Last updated
- 26 Apr 2019
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Benabid AL, Pollak P, Louveau A, Henry S, de Rougemont J. Combined (thalamotomy and stimulation) stereotactic surgery of the VIM thalamic nucleus for bilateral Parkinson disease. Appl Neurophysiol. 1987;50(1-6):344-6. doi: 10.1159/000100803.
PubMed 3329873Perlmutter JS, Mink JW. Deep brain stimulation. Annu Rev Neurosci. 2006;29:229-57. doi: 10.1146/annurev.neuro.29.051605.112824.
PubMed 16776585Holtzheimer PE, Mayberg HS. Deep brain stimulation for psychiatric disorders. Annu Rev Neurosci. 2011;34:289-307. doi: 10.1146/annurev-neuro-061010-113638.
PubMed 21692660Hariz M, Blomstedt P, Zrinzo L. Future of brain stimulation: new targets, new indications, new technology. Mov Disord. 2013 Nov;28(13):1784-92. doi: 10.1002/mds.25665. Epub 2013 Oct 7.
PubMed 24123327Fontaine D, Lanteri-Minet M, Ouchchane L, Lazorthes Y, Mertens P, Blond S, Geraud G, Fabre N, Navez M, Lucas C, Dubois F, Sol JC, Paquis P, Lemaire JJ. Anatomical location of effective deep brain stimulation electrodes in chronic cluster headache. Brain. 2010 Apr;133(Pt 4):1214-23. doi: 10.1093/brain/awq041. Epub 2010 Mar 17.
PubMed 20237130Laxton AW, Tang-Wai DF, McAndrews MP, Zumsteg D, Wennberg R, Keren R, Wherrett J, Naglie G, Hamani C, Smith GS, Lozano AM. A phase I trial of deep brain stimulation of memory circuits in Alzheimer's disease. Ann Neurol. 2010 Oct;68(4):521-34. doi: 10.1002/ana.22089.
PubMed 20687206Boex C, Seeck M, Vulliemoz S, Rossetti AO, Staedler C, Spinelli L, Pegna AJ, Pralong E, Villemure JG, Foletti G, Pollo C. Chronic deep brain stimulation in mesial temporal lobe epilepsy. Seizure. 2011 Jul;20(6):485-90. doi: 10.1016/j.seizure.2011.03.001. Epub 2011 Apr 12.
PubMed 21489828Lozano AM, Giacobbe P, Hamani C, Rizvi SJ, Kennedy SH, Kolivakis TT, Debonnel G, Sadikot AF, Lam RW, Howard AK, Ilcewicz-Klimek M, Honey CR, Mayberg HS. A multicenter pilot study of subcallosal cingulate area deep brain stimulation for treatment-resistant depression. J Neurosurg. 2012 Feb;116(2):315-22. doi: 10.3171/2011.10.JNS102122. Epub 2011 Nov 18.
PubMed 22098195Torres N, Chabardes S, Piallat B, Devergnas A, Benabid AL. Body fat and body weight reduction following hypothalamic deep brain stimulation in monkeys: an intraventricular approach. Int J Obes (Lond). 2012 Dec;36(12):1537-44. doi: 10.1038/ijo.2011.271. Epub 2012 Feb 21.
PubMed 22349575Luigjes J, van den Brink W, Feenstra M, van den Munckhof P, Schuurman PR, Schippers R, Mazaheri A, De Vries TJ, Denys D. Deep brain stimulation in addiction: a review of potential brain targets. Mol Psychiatry. 2012 Jun;17(6):572-83. doi: 10.1038/mp.2011.114. Epub 2011 Sep 20.
PubMed 21931318Benabid AL, Chabardes S, Mitrofanis J, Pollak P. Deep brain stimulation of the subthalamic nucleus for the treatment of Parkinson's disease. Lancet Neurol. 2009 Jan;8(1):67-81. doi: 10.1016/S1474-4422(08)70291-6.
PubMed 19081516Zaccaria A, Bouamrani A, Chabardes S, El Atifi M, Seigneuret E, Lobrinus JA, Dubois-Dauphin M, Berger F, Burkhard PR. Deep brain stimulation-associated brain tissue imprints: a new in vivo approach to biological research in human Parkinson's disease. Mol Neurodegener. 2016 Jan 28;11:12. doi: 10.1186/s13024-016-0077-4.
PubMed 26822202Crecelius A, Gotz A, Arzberger T, Frohlich T, Arnold GJ, Ferrer I, Kretzschmar HA. Assessing quantitative post-mortem changes in the gray matter of the human frontal cortex proteome by 2-D DIGE. Proteomics. 2008 Mar;8(6):1276-91. doi: 10.1002/pmic.200700728.
PubMed 18283663Mexal S, Berger R, Adams CE, Ross RG, Freedman R, Leonard S. Brain pH has a significant impact on human postmortem hippocampal gene expression profiles. Brain Res. 2006 Aug 23;1106(1):1-11. doi: 10.1016/j.brainres.2006.05.043. Epub 2006 Jul 14.
PubMed 16843448Chariot P, Witt K, Pautot V, Porcher R, Thomas G, Zafrani ES, Lemaire F. Declining autopsy rate in a French hospital: physician's attitudes to the autopsy and use of autopsy material in research publications. Arch Pathol Lab Med. 2000 May;124(5):739-45. doi: 10.5858/2000-124-0739-DARIAF.
PubMed 10782159
Study at a glance
From the registry record, last updated by the sponsor on 26 Apr 2019. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Stimulation cérébrale Profonde et Empreinte Tissulaire : Une Nouvelle stratégie Pour la Recherche Biologique in Vivo Dans la Maladie de Parkinson, Les TOC, la Dystonie, le Tremblement Essentiel et le Syndrome Gilles de la Tourette.
- ClinicalTrials.gov ID
- NCT03929406
- Acronym / sponsor ID
- BTI / 2018-A03001-54
- Conditions
- Parkinson Disease, Neurologic Disorder
- Keywords
- Deep Brain Stimulation, Tissue harvesting, Molecular analysis - Proteomics
- Study type
- Interventional
- Recruitment status
- Unknown status
- Enrolment
- 40 participants (estimated)
- Lead sponsor
- University Hospital, GrenobleUniversity, hospital or other
- Study start
- May 2019 (estimated)
- Primary completion
- 30 Apr 2021 (estimated)
- Study completion
- 30 Apr 2021 (estimated)
- First posted
- 26 Apr 2019 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This exploratory study aims to validate the collection and analysis of brain tissue imprints during the DBS by using a CE marked Medical Device in patients presenting one of the following five disorders: Parkinson's disease (PD), essential tremor (ET), dystonia (DYS), Obsessive compulsive disorder (OCD) and Tourette Syndrome (TS).
The Brain Tissue Imprint project is focused on the DBS surgical procedure, which constitutes an appropriate method to collect brain tissue imprints by taking advantage of the direct and transitory contact at the extremity of the dilator with adjacent brain tissue. Indeed, during this step, micro-fragments of brain material spontaneously adhere to the dilator tip. It is this imprinting process that allows to collect what is defined as "brain tissue imprints. This approach is part of the standard surgical procedure of the SCP without major change or complications.
Detailed description
Deep brain stimulation (DBS) has become the standard functional neurosurgery treatment for drug resistant Parkinson's disease (PD) patients. It has also demonstrated its efficacy to treat various movement disorders as well as neurological and psychiatric disorders. The subthalamic nucleus (STN), the globus pallidus internal (GPi) or the ventral intermediate nucleus of the thalamus (VIM) are the major targets of DBS.
Access to pathological brain tissue in living PD patients or other neurological diseases is a key issue for the discovery of new therapeutic targets and the development of potential curative therapies. In this context, DBS offers a unique access to the pathological brain. In the standard surgical procedure, to prepare the way for the final electrode, the surgeon uses a dilator that is lowered gently through the cerebral parenchyma up to the target. It has been shown that during this step, brain tissue fragments adhere to the extremity of the dilator. However, the major drawback of the standard dilator lies in the fact that its end is in contact with several brain regions before reaching the targeted nucleus. Therefore, it is difficult to guarantee the origin of the collected tissue micro-fragments. In order to optimize the specificity of the harvested imprints, the investgator will use a dedicated CE marked medical device that consists of a guide tube and a stylet instead of the dilator used in DBS surgical procedure. The objective of this study is to validate brain tissue imprints collection in PD, ET, DYS, OCD and TS.
The BTI will be specifically collected from the targeted implantation site corresponding to the STN, the GPi and the VIM. Moreover, the tip of the electrode (and therefore the BTI) often reaches the substantia negra pars compacta (SNpc) because of its proximity with the STN. The ability to perform BTI in the SNpc is of highly interest since it is the structure containing the neurons that degenerate gradually and massively throughout the pathological process of Parkinson's disease.
Study design
- Primary purpose
- Other
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Brain Tissue Imprint | Experimental | Device: Brain Tissue ImprintEvaluation and validation of the samples collected during the brain tissue imprint procedure using a CE marked Medical Device in patients presenting one of the following five disorders: Parkinson's disease (PD), essential tremor (ET), dystonia (DYS), Obsessive compulsive disorder (OCD) and Tourette Syndrome (TS). |
Who may qualify
- Ages
- 18 to 80 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (3 listed)
- Eligible patients for deep brain stimulation surgery
- Patients affiliated to social security or benefiting of a similar insurance scheme
- Patients having signed a consent to participate to the study
Key exclusion criteria (5 listed)
- Patient not eligible for deep brain stimulation surgery
- Pregnant women or nursing mothers
- Persons deprived of liberty by judicial or administrative decision
- Persons unable to express their consent or legally protected
- Persons in period of disqualification for another interventional research
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Brain Tissue ImprintBrain Tissue Imprint procedure (BTI) is performed during DBS surgery. Before the implantation of the electrode, the surgeon uses a dilator. It is a rigid stylet with a blunt end, intended to prepare the way for the final electrode. This dilator is lowered gently through the cerebral parenchyma up to the target then removed to be replaced by the electrode. In our BTI study, the standard dilator used in DBS surgery will be replaced by a CE marked Medical Device. This brain imprint kit will be used for each hemisphere. The procedure is the following: * The guide tube with the first stylet is set up to the target * Withdrawal of the first stylet and insertion of the second stylet for one minute to have a spontaneous and adequate tissue adhesion * Withdrawal of the guide tube containing the stylet. This last step will prevent contamination of the harvested material on the stylet during the removal. | Device | Brain Tissue Imprint |
Primary outcome
Validation of the collection of brain tissue fragments on the BTI device during the DBS surgical procedure
Time frame: The evaluation of the collection of brain tissue fragments will be performed in the surgery room when the BTI device is removed from the patient and inserted in the collection tube
Visual assessment of the presence or the absence of a tissue micro-fragment. The presence or absence of blood contamination will also be notified
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 26 Apr 2019.
- Background: PubMed 3329873Benabid AL, Pollak P, Louveau A, Henry S, de Rougemont J. Combined (thalamotomy and stimulation) stereotactic surgery of the VIM thalamic nucleus for bilateral Parkinson disease. Appl Neurophysiol. 1987;50(1-6):344-6. doi: 10.1159/000100803.
- Background: PubMed 16776585Perlmutter JS, Mink JW. Deep brain stimulation. Annu Rev Neurosci. 2006;29:229-57. doi: 10.1146/annurev.neuro.29.051605.112824.
- Background: PubMed 21692660Holtzheimer PE, Mayberg HS. Deep brain stimulation for psychiatric disorders. Annu Rev Neurosci. 2011;34:289-307. doi: 10.1146/annurev-neuro-061010-113638.
- Background: PubMed 24123327Hariz M, Blomstedt P, Zrinzo L. Future of brain stimulation: new targets, new indications, new technology. Mov Disord. 2013 Nov;28(13):1784-92. doi: 10.1002/mds.25665. Epub 2013 Oct 7.
- Background: PubMed 20237130Fontaine D, Lanteri-Minet M, Ouchchane L, Lazorthes Y, Mertens P, Blond S, Geraud G, Fabre N, Navez M, Lucas C, Dubois F, Sol JC, Paquis P, Lemaire JJ. Anatomical location of effective deep brain stimulation electrodes in chronic cluster headache. Brain. 2010 Apr;133(Pt 4):1214-23. doi: 10.1093/brain/awq041. Epub 2010 Mar 17.
- Background: PubMed 20687206Laxton AW, Tang-Wai DF, McAndrews MP, Zumsteg D, Wennberg R, Keren R, Wherrett J, Naglie G, Hamani C, Smith GS, Lozano AM. A phase I trial of deep brain stimulation of memory circuits in Alzheimer's disease. Ann Neurol. 2010 Oct;68(4):521-34. doi: 10.1002/ana.22089.
- Background: PubMed 21489828Boex C, Seeck M, Vulliemoz S, Rossetti AO, Staedler C, Spinelli L, Pegna AJ, Pralong E, Villemure JG, Foletti G, Pollo C. Chronic deep brain stimulation in mesial temporal lobe epilepsy. Seizure. 2011 Jul;20(6):485-90. doi: 10.1016/j.seizure.2011.03.001. Epub 2011 Apr 12.
- Background: PubMed 22098195Lozano AM, Giacobbe P, Hamani C, Rizvi SJ, Kennedy SH, Kolivakis TT, Debonnel G, Sadikot AF, Lam RW, Howard AK, Ilcewicz-Klimek M, Honey CR, Mayberg HS. A multicenter pilot study of subcallosal cingulate area deep brain stimulation for treatment-resistant depression. J Neurosurg. 2012 Feb;116(2):315-22. doi: 10.3171/2011.10.JNS102122. Epub 2011 Nov 18.
- Background: PubMed 22349575Torres N, Chabardes S, Piallat B, Devergnas A, Benabid AL. Body fat and body weight reduction following hypothalamic deep brain stimulation in monkeys: an intraventricular approach. Int J Obes (Lond). 2012 Dec;36(12):1537-44. doi: 10.1038/ijo.2011.271. Epub 2012 Feb 21.
- Background: PubMed 21931318Luigjes J, van den Brink W, Feenstra M, van den Munckhof P, Schuurman PR, Schippers R, Mazaheri A, De Vries TJ, Denys D. Deep brain stimulation in addiction: a review of potential brain targets. Mol Psychiatry. 2012 Jun;17(6):572-83. doi: 10.1038/mp.2011.114. Epub 2011 Sep 20.
- Background: PubMed 19081516Benabid AL, Chabardes S, Mitrofanis J, Pollak P. Deep brain stimulation of the subthalamic nucleus for the treatment of Parkinson's disease. Lancet Neurol. 2009 Jan;8(1):67-81. doi: 10.1016/S1474-4422(08)70291-6.
- Background: PubMed 26822202Zaccaria A, Bouamrani A, Chabardes S, El Atifi M, Seigneuret E, Lobrinus JA, Dubois-Dauphin M, Berger F, Burkhard PR. Deep brain stimulation-associated brain tissue imprints: a new in vivo approach to biological research in human Parkinson's disease. Mol Neurodegener. 2016 Jan 28;11:12. doi: 10.1186/s13024-016-0077-4.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Stéphan Chabardès, Pr principal investigator
Grenoble Hospital - Service de Neurochirurgie, CHUGA
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Brain Tissue Imprint in people with Parkinson Disease and Neurologic Disorder, run by University Hospital, Grenoble at 1 site in France.
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 5 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: status not confirmed, as of the sponsor's last update on 26 Apr 2019. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in France. 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?
Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
Contact Stéphan Chabardès, Pr (+33 4 76 76 75 59, SChabardes@chu-grenoble.fr), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Validation of the collection of brain tissue fragments on the BTI device during the DBS surgical procedure (time frame: The evaluation of the collection of brain tissue fragments will be performed in the surgery room when the BTI device is removed from the patient and inserted in the collection tube). 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 NCT03929406, which also lists 15 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 26 Apr 2019; AzTrials last refreshed its copy on 27 Oct 2026.