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Evaluation of the Effect of Botulinum Toxin on Resting Tremor of the Refractory Upper Limb in Parkinsonians, Cross-over Study, Double Blind and Placebo-controlled (TOX PARK)

torstai 10. syyskuuta 2026 päivittänyt: University Hospital, Toulouse
Tremor is one of the most common symptoms in Parkinson Disease (PD), affecting almost 60% of patients. There is currently no specific treatment for tremor in PD, and 30% of patients develop drug-resistant tremor, making its management more complex. Botulinum toxin (BT) is widely used in neurology, but few studies have been carried out on the effect of BT in parkinsonian tremor without consensus on its management in parkinsonian patients. In this study, we therefore propose to evaluate the effect of BT injected using precision medicine in the treatment of refractory resting tremor in patients with PD, compared with placebo injection.

Tutkimuksen yleiskatsaus

Tila

Ei vielä rekrytointia

Ehdot

Interventio / Hoito

Yksityiskohtainen kuvaus

Parkinson's disease (PD) is the second most common neurodegenerative disease. Tremor is one of the most common symptoms, affecting almost 60% of patients. It has a considerable impact on their quality of life, causing psychosocial stress in over 25% of patients. There is currently no specific treatment for tremor in PD, and 30% of patients develop drug-resistant tremor, making its management more complex. Botulinum toxin (BT) has been approved in France in 1994 and is widely used in neurology. To date, few studies have been carried out on the effect of BT in parkinsonian tremor: most have been open-label and have mixed parkinsonian patients and patients with essential tremor. Therefore, there is no consensus on the management of tremor in patients with PD. Nevertheless, there is a real need for treatment of refractory tremor, particularly in elderly patients, patients who cannot tolerate high doses of medication or patients who are ineligible for neurostimulation. In this study, we therefore propose to evaluate the effect of BT injected using precision medicine in the treatment of refractory resting tremor in parkinsonian patients, compared with placebo injection. We hypothesize that BT treatment improves parkinsonian tremor in a clinically relevant way compared to placebo injection using an optimized and personalized injection technique (doses of toxin and muscles injected). The drug will be injected intramuscularly into the muscles identified as responsible for the tremor, by an investigator specialising in injections. PD patients with resistant tremor will be included and followed up in this study for one year. BT or placebo will be injected at 6 months apart in all patients thanks to the cross over study design.

Opintotyyppi

Interventio

Ilmoittautuminen (Arvioitu)

39

Vaihe

  • Vaihe 3

Yhteystiedot ja paikat

Tässä osiossa on tutkimuksen suorittajien yhteystiedot ja tiedot siitä, missä tämä tutkimus suoritetaan.

Opiskeluyhteys

Opiskelupaikat

  • Ranska
      • Nîmes, Ranska, 30 029
        • Nîmes University Hospital
        • Ottaa yhteyttä:
        • Päätutkija:
          • Giovanni Castelnovo, MD
      • Toulouse, Ranska, 31 059
        • Pierre Paul Riquet Hospital - Toulouse University Hospital
        • Ottaa yhteyttä:
        • Päätutkija:
          • Clémence Leung, MD

Osallistumiskriteerit

Tutkijat etsivät ihmisiä, jotka sopivat tiettyyn kuvaukseen, jota kutsutaan kelpoisuuskriteereiksi. Joitakin esimerkkejä näistä kriteereistä ovat henkilön yleinen terveydentila tai aiemmat hoidot.

Kelpoisuusvaatimukset

Opintokelpoiset iät

  • Aikuinen
  • Vanhempi Aikuinen

Hyväksyy terveitä vapaaehtoisia

Ei

Kuvaus

Inclusion Criteria:

  • Patients with PD defined according to UKPDSBB criteria;
  • Men and women aged between 40 and 80 years;
  • Patients with troublesome rest tremor assessed by the CGI-S scale ≥ 3 and persistent despite the initiation of ≥ two anti-parkinsonian treatments (levodopa, dopaminergic agonist, anticholinergic), which defines drug-resistant parkinsonian tremor;
  • Patients naïve to botulinum toxin treatment;
  • Patients whose antiparkinsonian treatment has been stable for at least 4 weeks prior to inclusion and for the duration of the study;
  • Person affiliated with or beneficiary of a social security scheme;
  • Free, informed, and written consent signed by the participant and the investigator (no later than the day of inclusion and before any examination required by the research).

Exclusion Criteria:

  • Patients with tremors related to a pathology other than PD;
  • Patients with atypical parkinsonian syndrome;
  • Patients treated with drugs which have the adverse effect of causing the appearance or aggravation of tremors: lithium, sodium valproate, levetiracetam, benzodiazepines, corticosteroids, thyroid hormones, ciclosporin, alcohol, tricyclic antidepressants, theophillyne, terbutaline, antipsychotics (excluding clozapine) ;
  • Patients with hypersensitivity to the active substance or to one of the excipients (human albumin, lactulose);
  • patients with atrophy of the target muscle
  • patients with a urinary tract infection at the time of treatment if the patient suffers from urinary incontinence due to neurological detrusor overactivity
  • patients with a history of swallowing or respiratory disorders;
  • patients with marked clinical or subclinical neuromuscular transmission deficits (e.g., myasthenia gravis);
  • patients with fixed contractures Pregnant or breastfeeding women;
  • Women of childbearing age without effective contraception;
  • Patients under legal guardianship, tutorship, or curatorship.

Opintosuunnitelma

Tässä osiossa on tietoja tutkimussuunnitelmasta, mukaan lukien kuinka tutkimus on suunniteltu ja mitä tutkimuksella mitataan.

Miten tutkimus on suunniteltu?

Suunnittelun yksityiskohdat

  • Ensisijainen käyttötarkoitus: Hoito
  • Jako: Satunnaistettu
  • Inventiomalli: Crossover-tehtävä
  • Naamiointi: Kaksinkertainen

Aseet ja interventiot

Osallistujaryhmä / Arm
Interventio / Hoito
Kokeellinen: Botulinum toxin followed by placebo arm
In this cross-over study, the patient will be his or her own control. The patient will receive both treatments at 6 months apart: DYSPORT followed by the placebo (the order of injections has been randomly assigned).
Lääke: Injection of Dysport then placebo
Both treatments, first DYSPORT 500UI for 6 months then placebo, also for 6 months, will be administered intramuscularly using the same schedule and procedures thus allowing the blind to be maintained. The two injections will be carried at 6 months apart: the drug will be injected intramuscularly, into the muscles identified as responsible for the tremor, by an investigator specialized in carrying out injections. The doses injected will depend on the severity of the tremor and the number of muscles injected, which is conditioned by the tremor phenotype.
Kokeellinen: Placebo followed by botulinum toxin arm
In this cross-over study, the patient will be his or her own control. The patient will receive both treatments at 6 months apart: placebo followed by DYSPORT (the order of injections has been randomly assigned).
Lääke: Injection of placebo then Dysport
Both treatments, first placebo for 6 months then DYSPORT 500UI, also for 6 months, will be administered intramuscularly using the same schedule and procedures thus allowing the blind to be maintained. The two injections will be carried at 6 months apart: the drug will be injected intramuscularly, into the muscles identified as responsible for the tremor, by an investigator specialized in carrying out injections. The doses injected will depend on the severity of the tremor and the number of muscles injected, which is conditioned by the tremor phenotype.

Mitä tutkimuksessa mitataan?

Ensisijaiset tulostoimenpiteet

Tulosmittaus
Toimenpiteen kuvaus
Aikaikkuna
The effect of botulinum toxin on the resting tremor of the upper limb refractory to treatments
Aikaikkuna: 7,5 months
It will be assessed by the PGI-C (Patient Global Impression-Change) score completed by the patient six weeks after injection and compared between treatments.
7,5 months

Toissijaiset tulostoimenpiteet

Tulosmittaus
Toimenpiteen kuvaus
Aikaikkuna
The effect of botulinum toxin on the resting tremor: evolution evaluated by the investigator
Aikaikkuna: 7,5 months
It will be assessed by the CGI-C (Clinician Global Impression-Change) investigator-level change score, six weeks after injection.
7,5 months
The effect of botulinum toxin on the resting tremor: severity evaluated by the investigator
Aikaikkuna: 7,5 months
It will be assessed by the delta of severity scores at the CGI-S (Clinician Global Impression-Severity) investigator level between injection and six weeks post-injection.
7,5 months
The effect of botulinum toxin on the resting tremor: amplitude evaluated by the investigator
Aikaikkuna: 7,5 months
It will be assessed by the delta of the item score 3.17 (amplitude) at the MDS-UPDRS III investigator level between injection and six weeks post-injection.
7,5 months
The effect of botulinum toxin on the resting tremor: patient-assessed severity
Aikaikkuna: 7,5 months
It will be assessed by the delta of severity scores at the patient scale PGI-S (Patient Global Impression-Severity) between injection and six weeks post-injection.
7,5 months
The effect of botulinum toxin on the postural tremor: evolution evaluated by the investigator
Aikaikkuna: 7,5 months
It will be assessed by the change score at the CGI-C investigator scale, at six weeks post-injection.
7,5 months
The effect of botulinum toxin on the postural tremor: severity evaluated by the investigator
Aikaikkuna: 7,5 months
It will be assessed by the delta of severity scores at the CGI-S investigator level between injection and six weeks post-injection.
7,5 months
The effect of botulinum toxin on the postural tremor: amplitude evaluated by the investigator
Aikaikkuna: 7,5 months
It will be assessed by the delta of item 3.21 (amplitude) at the MDS-UPDRS III investigator level between injection and six weeks post-injection.
7,5 months
The effect of botulinum toxin on the postural tremor: patient-assessed change
Aikaikkuna: 7,5 months
It will be assessed by the PGI-C scale score completed by the patient six weeks after injection and compared between groups.
7,5 months
The effect of botulinum toxin on the postural tremor: patient-assessed severity
Aikaikkuna: 7,5 months
It will be assessed by the delta of severity scores on the PGI-S (Patient Global Impression-Severity) scale completed by the patient between the injection and six weeks post-injection.
7,5 months
The effect of botulinum toxin on the Parkinsonian tremor (at rest and postural): duration
Aikaikkuna: 12 months
It will be assessed by the proportion of time the patient has a tremor, measured using an actimeter for 7 days prior to the assessment visit.
12 months
The effect of botulinum toxin on the Parkinsonian tremor (at rest and postural): amplitude
Aikaikkuna: 7,5 months
It will be assessed by the mean angular amplitude measured using motion sensors placed on the hand and arm at six weeks post-injection.
7,5 months
The effect of botulinum toxin on the Parkinsonian tremor (at rest and postural): frequency
Aikaikkuna: 7,5 months
It will be assessed by the mean frequency in Hertz (Hz) measured using motion sensors placed on the hand and arm at six weeks post-injection.
7,5 months
The effect of botulinum toxin on the patient's experience: life quality
Aikaikkuna: 7,5 months
It will be assessed by the delta of the patient's quality of life score on the PDQ-39 self-administered questionnaire between injection and six weeks post-injection.
7,5 months
The effect of botulinum toxin on the patient's experience: daily life activities
Aikaikkuna: 7,5 months
It will be assessed by the delta of the daily life activities score by the MDS-UPDRS scale, parts one and two between injection and six weeks post-injection.
7,5 months
The safety of use for botulinum toxin: muscle weakness (1)
Aikaikkuna: 7,5 months
It will be assessed by the delta of the measurement in Newton of the manual dynamometer, for the treated hand, between injection and six weeks after injection.
7,5 months
The safety of use for botulinum toxin: muscle weakness (2)
Aikaikkuna: 7,5 months
It will be assessed by the delta of the severity scores for muscle weakness in the treated hand, on the PGI-S (Patient Global Impression Severity) scale, completed by the patient between the injection and six weeks after the injection.
7,5 months
The safety of use for botulinum toxin: adverse events
Aikaikkuna: 12 months
It will be assessed by all the adverse events collected during the study.
12 months

Muut tulostoimenpiteet

Tulosmittaus
Toimenpiteen kuvaus
Aikaikkuna
The factors associated with good response to botulinum toxin treatment
Aikaikkuna: 12 months
The correct response to treatment will be determined from the scores of the PGI-S patient scale on the severity of the tremor and on the severity of the muscle weakness.
12 months

Yhteistyökumppanit ja tutkijat

Täältä löydät tähän tutkimukseen osallistuvat ihmiset ja organisaatiot.

Sponsori

University Hospital, Toulouse

Tutkijat

  • Päätutkija: Clémence Leung, MD, University Hospital, Toulouse

Opintojen ennätyspäivät

Nämä päivämäärät seuraavat ClinicalTrials.gov-sivustolle lähetettyjen tutkimustietueiden ja yhteenvetojen edistymistä. National Library of Medicine (NLM) tarkistaa tutkimustiedot ja raportoidut tulokset varmistaakseen, että ne täyttävät tietyt laadunvalvontastandardit, ennen kuin ne julkaistaan ​​julkisella verkkosivustolla.

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Lisää tietoa

Tähän tutkimukseen liittyvät termit

Avainsanat

Muita asiaankuuluvia MeSH-ehtoja

Muut tutkimustunnusnumerot

  • RC31/25/0444
  • PHRC 24-79 (Muu apuraha/rahoitusnumero: French Ministry of Health)
  • 2026-525862-23-00 (Muu tunniste: ID-RCB)

Yksittäisten osallistujien tietojen suunnitelma (IPD)

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PÄÄTTÄMÄTÖN

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