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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)

10. september 2026 opdateret af: 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.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

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.

Undersøgelsestype

Interventionel

Tilmelding (Anslået)

39

Fase

  • Fase 3

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Studiesteder

  • Frankrig
      • Nîmes, Frankrig, 30 029
        • Nîmes University Hospital
        • Kontakt:
        • Ledende efterforsker:
          • Giovanni Castelnovo, MD
      • Toulouse, Frankrig, 31 059
        • Pierre Paul Riquet Hospital - Toulouse University Hospital
        • Kontakt:
        • Ledende efterforsker:
          • Clémence Leung, MD

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen
  • Ældre voksen

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Ingen

Beskrivelse

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.

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Dobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: 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).
Medicin: 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.
Eksperimentel: 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).
Medicin: 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.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
The effect of botulinum toxin on the resting tremor of the upper limb refractory to treatments
Tidsramme: 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

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
The effect of botulinum toxin on the resting tremor: evolution evaluated by the investigator
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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)
Tidsramme: 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)
Tidsramme: 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
Tidsramme: 12 months
It will be assessed by all the adverse events collected during the study.
12 months

Andre resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
The factors associated with good response to botulinum toxin treatment
Tidsramme: 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

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

University Hospital, Toulouse

Efterforskere

  • Ledende efterforsker: Clémence Leung, MD, University Hospital, Toulouse

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

1. oktober 2026

Primær færdiggørelse (Anslået)

1. oktober 2029

Studieafslutning (Anslået)

1. oktober 2029

Datoer for studieregistrering

Først indsendt

10. september 2026

Først indsendt, der opfyldte QC-kriterier

10. september 2026

Først opslået (Faktiske)

16. september 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

16. september 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

10. september 2026

Sidst verificeret

1. september 2026

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • RC31/25/0444
  • PHRC 24-79 (Andet bevillings-/finansieringsnummer: French Ministry of Health)
  • 2026-525862-23-00 (Anden identifikator: ID-RCB)

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