Botulinum Toxin Type A Injection to Prevent Keloid Recurrence
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT05072821 |
Recruitment Status :
Active, not recruiting
First Posted : October 11, 2021
Last Update Posted : November 18, 2023
|
- Study Details
- Tabular View
- No Results Posted
- Disclaimer
- How to Read a Study Record
Condition or disease | Intervention/treatment | Phase |
---|---|---|
Scar Keloid | Drug: Botulinum Toxin Type A Injection [Botox] Drug: 0.9% Sodium Chloride Injection | Phase 4 |
Continuous variables will be reported as the mean ± standard deviation(SD). Each aspect of the VSS score, POSAS score, and the Cutometer parameters of each scar half between the BTA and control groups will be analyzed longitudinally using the paired t test. The interrater consistency will be evaluated using the Spearman rho. All analyses will be performed with IBM SPSS Version 23.0 (IBM Corp., Redmond, Wash.). A value of p < 0.05 is considered to indicate statistical significance.
The sample size was calculated based on the results of the investigators' aforementioned study published in 2019. Thirty patients underwent keloid revision and then received radiation therapy based on our treatment protocol. The postoperative Vancouver Scar Scale score was 4.15 ± 1.74. If treatment could improve VSS score by 1, which was considered clinically significant, approximately 26 patients would have been necessary to provide a result with a real significance (using the same SD and considering the standard α error of 0.05 and a power of 0.8). Assuming a 20% non-compliance rate for follow-up evaluation, the sample size was increased to 32 patients.
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 28 participants |
Allocation: | Randomized |
Intervention Model: | Parallel Assignment |
Masking: | Double (Participant, Outcomes Assessor) |
Primary Purpose: | Prevention |
Official Title: | Immediate Injection of Botulinum Toxin Type A After Keloid Scar Revision to Prevent Keloid Recurrence: a Prospective, Split-scar, Double-blind, Randomized Controlled Study |
Actual Study Start Date : | October 13, 2020 |
Estimated Primary Completion Date : | March 20, 2024 |
Estimated Study Completion Date : | March 20, 2024 |
Arm | Intervention/treatment |
---|---|
Experimental: Botulinum Toxin type A injection side
The Botulinum Toxin type A will be injected into the dermal layer before skin closure in keloid excision surgery. The concentration of Botulinum Toxin type A is 100 units in 2 mL and dosage is 8 units/cm. The maximal dose is 100 units for each participant.
|
Drug: Botulinum Toxin Type A Injection [Botox]
After the whole surgical procedures of keloid revision are done, the participants will receive Botulinum Toxin type A (BTA) injection. The investigators split the scar into the right side and the left side. BTA and 0.9% saline, respectively, are used for the two arms of the study. Vials containing 100 units of BTA (BotoxⓇ, Allergan) are mixed with 2mL 0.9% injectable saline. The injection depth will be the intradermal layer. Injections will be performed with a 30-gauge needle and 1 mL syringe. Just before skin closure, the entire scar was treated, with sides randomized to receive treatment with either BTA or 0.9% normal saline. The dosage is 8 units / cm based on aforementioned studies. The maximal dose won't exceed 100 units. |
Placebo Comparator: 0.9% saline injection side
The 0.9% saline will be injected into the dermal layer before skin closure in keloid excision surgery. The dosage is 0.16 mL/cm.
|
Drug: 0.9% Sodium Chloride Injection
After the whole surgical procedures of keloid revision are done, the participants will receive 0.9% saline injection. The investigators split the scar into the right side and the left side. BTA and 0.9% saline, respectively, are used for the two arms of the study. Only 0.9% saline is injected on the control side. The injection depth will be the intradermal layer. Injections will be performed with a 30-gauge needle and 1 mL syringe. Just before skin closure, the entire scar was injected, with sides randomized to receive treatment with either BTA or 0.9% normal saline. The dosage is 0.16 mL / cm. |
- Keloid recurrence [ Time Frame: One year ]The recurrence of keloid will be determined by clinical examination evaluated by a dermatologist.
- Subjective symptoms [ Time Frame: 3, 6, 9 and 12 months ]The subjective symptoms will be measured by the Patient Scale of the Patient and Observer Scar Assessment Scale. The Patient Scale consists six items and scores from 1 to 10 for each items. The score of 1 means much alike the normal skin and the score of 10 means worst imaginable scar.
- Objective symptoms [ Time Frame: 3, 6, 9 and 12 months ]The subjective symptoms will be measured by the Observer Scale of the Patient and Observer Scar Assessment Scale. The Observer Scale consists six items and scores from 1 to 10 for each items. The score of 1 means much alike the normal skin and the score of 10 means worst imaginable scar.
- Vancouver Scar Scale [ Time Frame: 6 and 12 months ]One dermatologist will evaluate the scar with the Vancouver Scar Scale. The Vancouver Scar Scale consists 4 items. The minimum score is 0, which means the scar is much alike normal skin. The maximal score is 13, which means purple, hyperpigmentation, contracture and elevated scar.
- Scar firmness [ Time Frame: 6 and 12 months ]The scar firmness is determined by the Cutometer parameter R0. R0 is maximum amplitude of the curve (the total elongation). The larger R0 is, the softer the scar is.
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study: | 20 Years and older (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
- Adult (20 years or older)
- Progressive keloid lesion that is bilaterally symmetric, mandibular area, anterior chest or suprapubic area, for example
- At least 4 cm in length
- Repeated or uncontrolled recurrence, and unendurable symptoms with poor response to conservative modalities
- Valid written informed consent provided for surgery and trial inclusion
Exclusion Criteria:
- Allergy to botulinum toxin
- Previous botulinum toxin injection at the lesion within 6 months before enrollment
- Myasthenia gravis
- Focal infection signs
- Pregnant or breastfeeding woman
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT05072821
Taiwan | |
National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University | |
Tainan, Taiwan |
Principal Investigator: | Yuan-Yu Hsueh, MD PhD | National Cheng-Kung University and Hospital |
Responsible Party: | National Cheng-Kung University Hospital |
ClinicalTrials.gov Identifier: | NCT05072821 |
Other Study ID Numbers: |
MOHW109-TDU-B-211-114003 |
First Posted: | October 11, 2021 Key Record Dates |
Last Update Posted: | November 18, 2023 |
Last Verified: | November 2023 |
Studies a U.S. FDA-regulated Drug Product: | No |
Studies a U.S. FDA-regulated Device Product: | No |
Product Manufactured in and Exported from the U.S.: | No |
Keloid Botulinum Toxin type A Radiotherapy |
Keloid Recurrence Disease Attributes Pathologic Processes Collagen Diseases Connective Tissue Diseases Cicatrix Fibrosis Botulinum Toxins Botulinum Toxins, Type A |
abobotulinumtoxinA Acetylcholine Release Inhibitors Membrane Transport Modulators Molecular Mechanisms of Pharmacological Action Cholinergic Agents Neurotransmitter Agents Physiological Effects of Drugs Neuromuscular Agents Peripheral Nervous System Agents |