Comparison of Efficacy and Safety of Two Different Types of Botulinum Toxin Type A in Moderate to Severe Cervical Dystonia

Study Overview
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Brief Summary
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The purpose of this study is to compare two types of botulinum toxin type A to treat the involuntary muscle contractions in the neck

Conditions
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Spasmodic Torticollis

Intervention / Treatment
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* Biological: botulinum toxin type A
* Biological: botulinum toxin type A


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Diagnosed with cervical dystonia/spasmodic torticollis for at least 18 months Successfully treated previously with botulinum toxin type A Exclusion Criteria: Breast feeding, pregnant or could become pregnant Surgery or spinal cord stimulation for cervical dystonia Previous injections of phenol, alcohol for cervical dystonia

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: BOTOX®<br>botulinum toxin type A (BOTOX®) | Biological: botulinum toxin type A<br>* 200 Units at Visit 1 (Day 1)<br>* Other names: BOTOX®;|
| Active Comparator: Dysport®<br>botulinum toxin type A (Dysport®) | Biological: botulinum toxin type A<br>* 750 Units at Visit 1 (Day 1)<br>* Other names: Dysport®;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Dysphagia Incidence Over 10 Weeks | Dysphagia Incidence (difficulty swallowing) was defined as the number of patients reporting at least 1 treatment-emergent dysphagia event at any point in the study. Occurrences of dysphagia were captured as spontaneous events or were assessed during study visits using the Structured Symptom Interview (SSI) and the Dystonia Study Group Dysphagia Interview (DSGDI) for symptoms of difficulty swallowing; coughing while eating and drinking; choking while eating or drinking; or difficulty swallowing solids or liquids. | 10 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Toronto Western Spasmodic Torticollis Rating Scale (TWSTRS) Total Score at Week 4 | The TWSTRS assessments were conducted at each study visit. The TWSTRS is an assessment scale used to measure the impact of cervical dystonia on patients. It is comprised of 3 subscales: Severity, Disability, and Pain, each of which is scored independently. The total of these 3 comprises the TWSTRS total score which is scored from 0 (least symptoms) to 85 (worst symptoms). Higher scores indicate a greater degree of symptom severity. | Baseline, Week 4 | 
| Physician Assessment of Cervical Dystonia Severity at Week 4 | Physician assessment of cervical dystonia severity. The rating was assessed on a scale of 0 to 10, with higher scores denoting greater severity: 0 represented 'No evidence of dystonia' and 10 represented 'Worst cervical dystonia ever.' | Baseline, Week 4 | 
| Global Assessment of Benefit by Physician at Week 4 | Physician evaluation of benefit from botulinum toxin type A treatment for cervical dystonia. Ratings were on a scale of +4 to -4, with higher scores denoting improvement in cervical dystonia: +4 was 'Complete abolishment of signs and symptoms (about 100% improvement)', 0 represented 'Unchanged', and -4 represented 'Very marked worsening (about 100% worse or greater).' | Week 4 | 
| Global Assessment of Benefit by Patient at Week 4 | Patient evaluation of benefit from botulinum toxin type A treatment for cervical dystonia. Ratings were on a scale of +4 to -4, with higher scores denoting improvement in cervical dystonia: +4 was 'Complete abolishment of signs and symptoms (about 100% improvement)', 0 represented 'Unchanged', and -4 represented 'Very marked worsening (about 100% worse or greater).' | Week 4 | 
| Patient Assessment of Need for Retreatment at Week 4 | Patients were queried regarding their need for another injection of botulinum toxin type A for cervical dystonia. Patients were required to answer How would you rate your need for another injection of botulinum toxin type A for cervical dystonia using the following scale?. The response options included 'absolutely requires injection', 'very much requires injection', 'somewhat requires injection' and 'does not require injection'. | Baseline, Week 4 | 
| Patient Visual Analog Assessment of Pain at Week 4 | Patients were required to assess their pain using a Visual Analog Scale in reference to their current perception of pain at that visit. This scale consisted of a line measuring 100 mm, and patients were instructed to put a mark on the line at the point that best described 'How much pain you are having right now'. Higher scores denoted higher pain intensity: 0 indicated 'No pain' and 100 indicated 'Worst possible pain'. | Baseline, Week 4 | 
| Physician Comparison of Benefit to Previous Injections at Week 10 | Physicians assessed the improvement in cervical dystonia after the study treatment compared to previous treatment(s) for each patient. Physicians were required to answer How would you rate the benefit of the current treatment of cervical dystonia with botulinum toxin type A compared to the previous treatment using the following scale?. The response options were 'much worse', 'worse', 'somewhat worse', 'same as previous', 'somewhat better', 'better', and 'much better'. | Week 10 | 
| Patient Comparison of Benefit to Previous Injections at Week 10 | Patients assessed the improvement in cervical dystonia after receiving the study treatment compared to previous treatment(s). Patients were required to answer How would you rate the benefit of the current treatment of cervical dystonia with botulinum toxin type A compared to the previous treatment using the following scale?. The response options were 'much worse', 'worse', 'somewhat worse', 'same as previous', 'somewhat better', 'better', and 'much better'. | Week 10 |