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RecruitingNCT06734598Updated Dec 16, 2024

Efficacy of Botox Injection of the Masticatory Muscles in Head &Neck Cancer Patients with Trismus After Radiotherapy

A Phase 4 interventional study of Echo-guided Botox injection and echo-guided normal saline injection in Trismus, Head and Neck Cancer and Radiation Therapy Recipient, sponsored by National Taiwan University Hospital. Recruiting at 1 site in Taiwan. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2024-12-16.

Sponsored by National Taiwan University Hospital · Phase 4, Interventional, and Treatment

From the registry’s dates

  • Primary completion was expected by Nov 2025, 1 year ago, but the record still lists the study as recruiting.
  • Started Dec 2024; still recruiting 1 year 11 months later.
Phase
Phase 4
Study type
Interventional
Enrollment
120
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

Trismus is a common side effect in head and neck cancer patients after radiation therapy. This project aims to explore the therapeutic effect of Botulinum toxin (Botox) injection to the masticatory muscles in the above-mentioned patients.

In this project, Botulinum toxin will be injected into the masticatory muscles (medial pterygoid and masticatory muscles), combined with oral rehabilitation exercises, to reduce the patient's masticatory muscle tension and spasm. Patient's mouth opening range, quality of life, trismus condition and pain will be evaluated to understand its efficacy.

02

Conditions studied

  • Trismus
  • Head and Neck Cancer
  • Radiation Therapy Recipient
  • BOTOX
03

In context

Trismus

107 studies on the registry are indexed under Trismus; 19 are open to participants now.

This study's planned enrollment of 120 is above the median of 52 across 99 interventional studies indexed under Trismus.

Browse Trismus studies →

Lead sponsor

National Taiwan University Hospital is the lead sponsor of 2,615 studies on the registry; 576 are open to participants now.

Of its 11 completed or terminated interventional studies of FDA-regulated products, 2 (18%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. Aged over 18 years old;
  2. Head and neck cancer patients must have completed radiotherapy for at least 3 months;
  3. Those whose mouth-opening distance is less than or equal to 3.5 cm (the functional cut-off point of trismus) and who have tightness or pain in the masticatory muscles;
  4. Medical condition is stable;

Exclusion criteria

Exclusion Criteria:

  1. Those who have undergone surgery on their masticatory muscles;
  2. Patients with obvious muscle atrophy or complete fibrosis of masticatory muscles ;
  3. Those with tumor recurrence at the time of admission;
  4. Those whose vital signs are unstable due to acute illness.
05

Study design

Phase
Phase 4
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Triple (Participant, Care provider, Outcomes assessor)
Enrollment
120 participants (estimated)

Study arms

  • Experimental
    Botox injection

    Drug: Echo-guided Botox injection

  • Placebo comparator
    Normal Saline Injection

    Procedure: echo-guided normal saline injection

Interventions

  • DrugEcho-guided Botox injection

    Echo-guided Botox injection to the masticatory muscles

  • Procedureecho-guided normal saline injection

    echo-guided normal saline injection

06

What researchers measure

Primary outcomes

  1. Maximal Incisal Opening

    Time frame: From enrollment to the end of treatment at 6 months

07

Study locations

1 of 1 sites recruiting
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Started Dec 2024 (actual). Primary completion is estimated for Nov 2025, 11 months after the start.

How these figures are worked out, and which studies are left out of them.

Registered
Dec 9, 2024
First posted
Dec 16, 2024
StartActual
Dec 1, 2024
Primary completionEst.
Nov 1, 2025
CompletionEst.
Feb 1, 2026
Last update
Dec 16, 2024
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Dec 16, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT06734598
Responsible party
Sponsor
First posted
Dec 16, 2024
Start date
Dec 1, 2024
Primary completion
Nov 1, 2025 (estimated)
Completion
Feb 1, 2026 (estimated)
Last update
Dec 16, 2024

Study contacts

Dr. Chen
Contact
b00401020@ntu.edu.tw
+88623123456

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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