An interventional study of STN alone and GPi alone in Parkinson Disease, sponsored by Dennis Turner, M.D.. Enrolling by invitation at 1 site in United States. Open to participants aged 18 Years to 75 Years. Per ClinicalTrials.gov, last updated 2026-11-12.
Sponsored by Dennis Turner, M.D. · Not applicable, Interventional, and Treatment
Among 1,649 studies in Parkinson Disease with a site in United States — 304 open to participants now, 387 under way, 7 of them phase 3. Parkinson Disease · United States.
Among the 1,649 studies in Parkinson Disease with a site in United States, this one is the 521st largest by planned enrollment of the 1,256 interventional ones that give a count, is one of 105 that started in 2019, is one of 585 with no phase, reaches primary completion later than 90 of the 384 other live ones, and was the 932nd registered.
4,576 studies on the registry are indexed under Parkinson Disease; 1,087 are open to participants now.
Browse Parkinson Disease studies →304 of the 1,649 studies in Parkinson Disease with a site in United States are open now. Recruiting first, the newest first:
The Cleveland Clinic · Sites in United States
Ages 18+
University of Colorado, Denver · Sites in United States
Ages 45–75
University of Minnesota · Sites in United States
Ages 18+
Hoffmann-La Roche · Sites in United States, China, United Kingdom
Ages 40–85
Medical University of South Carolina · Sites in United States
Ages 50–85
A study can be open while its sites in United States have not opened yet or have stopped. Only those recruiting at a site in United States →
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 to 75 Years · all sexes · no healthy volunteers.
The full table on the hub →This tab as a report to print or save as PDF → With an account.
1,649 studies; the count open now beside each. This study's row is marked.
A study in two phases is counted once above. Listed by phase, each with its combined phases: Phase 1 226 · Phase 2 304 · Phase 3 145 · Phase 4 75
First in 1991; this study’s year is marked. 105 started in 2019.
By drug class, each counting the studies that test any of its medicines:
This study's planned enrollment of 46 is above the median of 40 across 3,355 interventional studies indexed under Parkinson Disease.
Median enrollment 36 across the 1,256 interventional studies, 78 across the 379 observational. Of the 1,139 that completed or were terminated, 435 (38%) have results posted.
This tab as a report to print or save as PDF → With an account.
470 of 1,649 have an industry lead sponsor. The 10 most frequent:
Dennis Turner, M.D. is the lead sponsor of 2 studies on the registry; 1 is open to participants now.
Dennis Turner, M.D. has 2 studies filed under Parkinson Disease — fewer than ten, so there is no comparison to draw.
137 of the studies in Parkinson Disease with a site in United States that are under way reach primary completion within a year, 1 of them phase 3. Phase 3 first, then by date:
| Study | Primary completion |
|---|---|
| NCT06976268Phase 3Biohaven Therapeutics Ltd.A Study to Determine if BHV-8000 is Effective, Safe and Tolerable as a Treatment for Adults Living With Early Parkinson's Disease | 2027-08 |
| NCT06098612Massachusetts General HospitalPET Imaging Evaluation of [11C]SY08 | 2026-11 |
| NCT06489483University of Texas Southwestern Medical CenterAction Regulation Behavioral | 2026-11 |
| NCT05558189Stanford UniversityVibrotactile Coordinated Reset for the Treatment of Post Surgery Refractory Parkinson's Disease Patients | 2026-11-21 |
| NCT06773962TrueBinding, Inc.A Phase 2a Multicenter Clinical Trial of TB006 in Participants With Parkinson's Disease | 2026-11-28 |
Add all 137 to your calendar (.ics) → With an account.
Among the 1,649 studies in Parkinson Disease with a site in United States, from their registry updates:
This tab as a report to print or save as PDF → With an account.
This study involves patients who are already planning to have deep brain stimulation (DBS) surgery to treat the symptoms of severe Parkinson's Disease (PD). The study has two goals:
The purpose of this study is a small, first in man, clinical feasibility trial for patients with severe Parkinson's Disease (PD), who are already clinically eligible for deep brain stimulation (DBS) with two goals:
The study will involve bilateral dual DBS electrode placement in clinically standard locations (ie, STN and GPi) unilaterally or (more often) bilaterally, the placement of the RC+S Medtronic research implantable pulse generator (IPG), and a commitment to return for both extensive postoperative programming and testing to define clinical efficacy and separate research days to develop the closed loop approach. In addition, patients will undergo intraoperative research using temporary percutaneous extensions to the DBS electrode(s) and DBS lead cannula after implantation to confirm the electrode location and to identify what the signals will look like during later chronic recordings through the research IPG.
The research RC+S IPG includes both ordinary DBS stimulation as well as a recording system that simultaneously measures the DBS local evoked potential (DLEP) and/or local field potential (LFP) responses from either the same or a second DBS electrode.
In a separate cohort, we are enrolling healthy volunteers as blinded raters of audio recordings made by people with Parkinson's disease and without Parkinson's disease to study whether different features of speech patterns are specific to PD and whether there are measurable differences in these speech features when PD participants are on different deep brain stimulation settings. These ratings do not contribute to the primary or secondary endpoints of this study.
Study design details listed in this record are specific to the Implanted RC+S clinical trial cohort.
Implanted RC+S arm Inclusion / Exclusion Criteria:
Inclusion Criteria:
Exclusion Criteria:
Speech Rater Inclusion / Exclusion Criteria:
Inclusion Criteria:
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Implanted Medtronic RC+S IPG with dual DBS electrodes in STN and GPi. DBS stimulation will be administered to: 1) STN alone, 2) GPi alone, 3) cooperative STN + GPi, and 4) adaptive, closed-loop stimulation of STN and/or GPi.
Device: STN alone · Device: GPi alone · Device: STN + GPi · Device: Closed-loop stimulation
blinded raters to score audio recordings of speech
DBS stimulation of STN alone
DBS stimulation of GPi alone
cooperative DBS stimulation of STN and GPi sites
adaptive DBS stimulation of STN and/or GPi sites
Change in Unified Parkinson's Disease Rating Scale (UPDRS) score: "on" medication, "on" stimulation at 12 months after IPG implant.
Change in UPDRS score for subject from baseline (pre-surgery) "on" medication state to "on" medication and "on" stimulation state at 12 months after IPG implant. The UPDRS is a scale to measure the degree of a patient's disability due to Parkinson's Disease. The scores from four subscales (1. Mentation, Behavior and Mood, 2. Activities of Daily Living, 3. Motor Examination, and 4. Complications of Therapy) are summed to determine the total UPDRS score. Total scores range from 0 (no disability) to 199 (total disability).
Time frame: baseline and 12 months after IPG implant
Change in Unified Parkinson's Disease Rating Scale (UPDRS) score: "on" medication, "on" stimulation at 24 months after IPG implant.
Change in UPDRS score for subject from baseline (pre-surgery) "on" medication state to "on" medication and "on" stimulation state at 24 months after IPG implant. The UPDRS is a scale to measure the degree of a patient's disability due to Parkinson's Disease. The scores from four subscales (1. Mentation, Behavior and Mood, 2. Activities of Daily Living, 3. Motor Examination, and 4. Complications of Therapy) are summed to determine the total UPDRS score. Total scores range from 0 (no disability) to 199 (total disability).
Time frame: baseline and 24 months after IPG implant
Change in Unified Parkinson's Disease Rating Scale (UPDRS) score: "on" medication, "on" stimulation at 48 months after IPG implant.
Change in UPDRS score for subject from baseline (pre-surgery) "on" medication state to "on" medication and "on" stimulation state at 48 months after IPG implant. The UPDRS is a scale to measure the degree of a patient's disability due to Parkinson's Disease. The scores from four subscales (1. Mentation, Behavior and Mood, 2. Activities of Daily Living, 3. Motor Examination, and 4. Complications of Therapy) are summed to determine the total UPDRS score. Total scores range from 0 (no disability) to 199 (total disability).
Time frame: baseline and 48 months after IPG implant
Change in Unified Parkinson's Disease Rating Scale (UPDRS) score: "on" medication, "on" stimulation at 72 months after IPG implant.
Change in UPDRS score for subject from baseline (pre-surgery) "on" medication state to "on" medication and "on" stimulation state at 72 months after IPG implant. The UPDRS is a scale to measure the degree of a patient's disability due to Parkinson's Disease. The scores from four subscales (1. Mentation, Behavior and Mood, 2. Activities of Daily Living, 3. Motor Examination, and 4. Complications of Therapy) are summed to determine the total UPDRS score. Total scores range from 0 (no disability) to 199 (total disability).
Time frame: baseline and 72 months after IPG implant
Change in Unified Parkinson's Disease Rating Scale, subscale III: Motor Evaluation (UPDRS-III) score: "off" medication, "on" stimulation at 12 months after IPG implant.
Change in UPDRS-III (Motor Evaluation) score from baseline (pre-surgery) "off" medication state to "off" medication and "on" stimulation state at 12 months after IPG implant. The UPDRS is a scale to measure the degree of a patient's disability due to Parkinson's Disease. Subscale III, Motor Examination, scores range from 0 (no disability) to 108 (total disability).
Time frame: baseline and 12 months after IPG implant
Change in Unified Parkinson's Disease Rating Scale, subscale III: Motor Evaluation (UPDRS-III) score: "off" medication, "on" stimulation at 24 months after IPG implant.
Change in UPDRS-III (Motor Evaluation) score from baseline (pre-surgery) "off" medication state to "off" medication and "on" stimulation state at 24 months after IPG implant. The UPDRS is a scale to measure the degree of a patient's disability due to Parkinson's Disease. Subscale III, Motor Examination, scores range from 0 (no disability) to 108 (total disability).
Time frame: baseline and 24 months after IPG implant
Change in Unified Parkinson's Disease Rating Scale, subscale III: Motor Evaluation (UPDRS-III) score: "off" medication, "on" stimulation at 48 months after IPG implant.
Change in UPDRS-III (Motor Evaluation) score from baseline (pre-surgery) "off" medication state to "off" medication and "on" stimulation state at 48 months after IPG implant. The UPDRS is a scale to measure the degree of a patient's disability due to Parkinson's Disease. Subscale III, Motor Examination, scores range from 0 (no disability) to 108 (total disability).
Time frame: baseline and 48 months after IPG implant
Change in Unified Parkinson's Disease Rating Scale, subscale III: Motor Evaluation (UPDRS-III) score: "off" medication, "on" stimulation at 72 months after IPG implant.
Change in UPDRS-III (Motor Evaluation) score from baseline (pre-surgery) "off" medication state to "off" medication and "on" stimulation state at 72 months after IPG implant. The UPDRS is a scale to measure the degree of a patient's disability due to Parkinson's Disease. Subscale III, Motor Examination, scores range from 0 (no disability) to 108 (total disability).
Time frame: baseline and 72 months after IPG implant
Change in percentage of waking hours with good "on" time at 12 months after IPG implant.
Change in percentage of waking hours subject experienced "on" time without troubling dyskinesias, based on 3-day motor diary, compared to pre-surgery baseline.
Time frame: baseline and 12 months after IPG implant
Change in percentage of waking hours with good "on" time at 24 months after IPG implant.
Change in percentage of waking hours subject experienced "on" time without troubling dyskinesias, based on 3-day motor diary, compared to pre-surgery baseline.
Time frame: baseline and 24 months after IPG implant
Change in percentage of waking hours with good "on" time at 48 months after IPG implant.
Change in percentage of waking hours subject experienced "on" time without troubling dyskinesias, based on 3-day motor diary, compared to pre-surgery baseline.
Time frame: baseline and 48 months after IPG implant
Change in percentage of waking hours with good "on" time at 72 months after IPG implant.
Change in percentage of waking hours subject experienced "on" time without troubling dyskinesias, based on 3-day motor diary, compared to pre-surgery baseline.
Time frame: baseline and 72 months after IPG implant
Change in Parkinson's Disease Questionnaire-39 (PDQ-39) patient satisfaction score at 12 months after IPG implant.
Change in PDQ-39 score compared to pre-surgery baseline. The PDQ-39 is a 39-item self-reporting questionnaire to assess the impact of Parkinson's Disease on quality of life. The PDQ-39 is divided into 8 dimensions (1. Mobility, 2. Activities of Daily Life, 3. Emotional Well-being, 4. Stigma, 5. Social Support, 6. Cognition, 7. Communication, and 8. Bodily Discomfort). The total score is the sum of the dimension total scores divided by 8. Scores range from 0 (better quality of life) to 100 (worse quality of life).
Time frame: baseline and 12 months after IPG implant
Change in Parkinson's Disease Questionnaire-39 (PDQ-39) patient satisfaction score at 24 months after IPG implant.
Change in PDQ-39 score compared to pre-surgery baseline. The PDQ-39 is a 39-item self-reporting questionnaire to assess the impact of Parkinson's Disease on quality of life. The PDQ-39 is divided into 8 dimensions (1. Mobility, 2. Activities of Daily Life, 3. Emotional Well-being, 4. Stigma, 5. Social Support, 6. Cognition, 7. Communication, and 8. Bodily Discomfort). The total score is the sum of the dimension total scores divided by 8. Scores range from 0 (better quality of life) to 100 (worse quality of life).
Time frame: baseline and 24 months after IPG implant
Change in Parkinson's Disease Questionnaire-39 (PDQ-39) patient satisfaction score at 48 months after IPG implant.
Change in PDQ-39 score compared to pre-surgery baseline. The PDQ-39 is a 39-item self-reporting questionnaire to assess the impact of Parkinson's Disease on quality of life. The PDQ-39 is divided into 8 dimensions (1. Mobility, 2. Activities of Daily Life, 3. Emotional Well-being, 4. Stigma, 5. Social Support, 6. Cognition, 7. Communication, and 8. Bodily Discomfort). The total score is the sum of the dimension total scores divided by 8. Scores range from 0 (better quality of life) to 100 (worse quality of life).
Time frame: baseline and 48 months after IPG implant
Change in Parkinson's Disease Questionnaire-39 (PDQ-39) patient satisfaction score at 72 months after IPG implant.
Change in PDQ-39 score compared to pre-surgery baseline. The PDQ-39 is a 39-item self-reporting questionnaire to assess the impact of Parkinson's Disease on quality of life. The PDQ-39 is divided into 8 dimensions (1. Mobility, 2. Activities of Daily Life, 3. Emotional Well-being, 4. Stigma, 5. Social Support, 6. Cognition, 7. Communication, and 8. Bodily Discomfort). The total score is the sum of the dimension total scores divided by 8. Scores range from 0 (better quality of life) to 100 (worse quality of life).
Time frame: baseline and 72 months after IPG implant
Intelligibility Rating of Recorded Sentences
Rated by volunteer blinded raters on a scale of 1 - 10, with 1 being completely unintelligible and 10 being completely intelligible.
Time frame: 1 hour
PDFs hosted by the registry, ClinicalTrials.gov.
Plan to share: Yes — IPD to be shared: IPD for all participants that support the primary and secondary outcome measures listed in clinicaltrials.gov, after deidentification.
Supporting information: Informed consent form
Time frame: Data are available now through the end of funding (estimated January 2027). Additional data are updated on an annual basis.
Access criteria: Supporting Information (informed consent form) is available on clinicaltrials.gov. IPD are available by request at the Data Archive for the BRAIN Initiative (dabi.loni.usc.edu). Requests for access will be evaluated through the end of grant funding (estimated January 2027).
Data sharing details ↗ · dabi.loni.usc.edu
Ran from Jul 2019 to primary completion in Oct 2026, 87 months.
Of 1,293 non-industry interventional studies with no phase under Parkinson Disease, half reached primary completion within 24 months of starting (the median), counting those still running; a quarter within 11 and three quarters within 44. This study's 87 months is above that.
Counting every sponsor, half of 1,369 studies reached it within 25 months; a quarter within 12 and three quarters within 44.
Since we started tracking on Sep 25, 2026, the dates moved once, on Nov 12, 2026: primary completion Jan 2027 → Oct 2026 and completion Jan 2027 → Jul 2027.
Earlier changes are on the record history on ClinicalTrials.gov ↗
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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Dennis Turner, M.D.