Post Excision/Mohs Scar Laser Resurfacing

Study Overview
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Brief Summary
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The purpose of this study is to evaluate the potential benefits of treating a surgical scar post excision with an ablative fractionated CO2 laser with the goal of decreasing the appearance and size of the scar.

Detailed Description
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The objective of this research is to determine, through a split scar study, that treating a post excision scar with a fractionated ablative CO2 laser improves both the texture and cosmetic appearance of the scar. An attempt will be made to determine the ideal timing for treating the excision scar as previous studies have ranged from treating the day of the excision up till 10 weeks post-excision. In order to evaluate the treated portion versus untreated portion of the scar, investigators and the subjects will use a quartile rating scale. In addition, punch biopsy samples will be taken to quantify the difference in collagen architecture 9 weeks after treatment with the laser. There will be a total of 7 study visits to include the day of the excision and laser treatment if randomized to this group, post-op day number 14 for suture removal as well as laser therapy if the subject has been randomized to that treatment group, 4 weeks post-op, 9 weeks post-op and laser treatment for subjects randomized to this time frame for treatment, 12 weeks post-op, 17 weeks post-op and 24 weeks post-op. Each visit will last approximately 30-45 minutes each in which clinical photos of the surgical scar will be taken and any wound care or side effects of the laser therapy or surgery will be addressed. Healing and scar appearance will be reviewed and rated at each of the six postsurgical visits.

Official Title
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Post Excision/Mohs Fractional CO2 Resurfacing: A Quantitative and Qualitative Scar Analysis Study

Conditions
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Skin Cancer

Intervention / Treatment
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* Device: Laser Treatment


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Must understand and voluntarily sign an informed consent form. Must be male or female and aged >18 years at the time of consent. Must be able to adhere to the study visit schedule and other protocol requirements. Patients undergoing skin excisions of the face/trunk/extremities. Exclusion Criteria: Inability to provide voluntary informed consent Use of laser or light based treatments to affected areas in past year Fitzpatrick Skin types 3-5 Surgical lesions located on the central chest History of keloid formation History of Accutane in the last six months

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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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Group 1 - day 1<br>Group 1 will receive laser therapy to half of the scar the day of the excision. | Device: Laser Treatment<br>* The subject will receive ablative fractional resurfacing with the Deep and Active FXTM platforms of the Lumenis Ultrapulse CO2 laser. The settings for treatment of scars on the face with the Deep platform will be 15% coverage, 15mJ at 150 Hz and 15% coverage, 12.5 mJ at 150 Hz for off the face. The Active platform settings will be 90 mJ with a density of 3 for the face and 70 mJ and a density of 2 for off the face. The DeepFXTM platform will be applied to the scar prior to the ActiveFX TM platform. Half of the excision scar will be treated with the appropriate settings and half will go untreated.<br>* Other names: Lumenis UltraPulse Total FXTM fractionated CO2 laser;|
| Active Comparator: Group 2 - day 14<br>Group 2 will receive laser therapy at the time of suture removal or post-operative day 14. | Device: Laser Treatment<br>* The subject will receive ablative fractional resurfacing with the Deep and Active FXTM platforms of the Lumenis Ultrapulse CO2 laser. The settings for treatment of scars on the face with the Deep platform will be 15% coverage, 15mJ at 150 Hz and 15% coverage, 12.5 mJ at 150 Hz for off the face. The Active platform settings will be 90 mJ with a density of 3 for the face and 70 mJ and a density of 2 for off the face. The DeepFXTM platform will be applied to the scar prior to the ActiveFX TM platform. Half of the excision scar will be treated with the appropriate settings and half will go untreated.<br>* Other names: Lumenis UltraPulse Total FXTM fractionated CO2 laser;|
| Active Comparator: Group 3 - week 9<br>Group 3 will receive laser treatment to half the scar at the 9 week postop visit. | Device: Laser Treatment<br>* The subject will receive ablative fractional resurfacing with the Deep and Active FXTM platforms of the Lumenis Ultrapulse CO2 laser. The settings for treatment of scars on the face with the Deep platform will be 15% coverage, 15mJ at 150 Hz and 15% coverage, 12.5 mJ at 150 Hz for off the face. The Active platform settings will be 90 mJ with a density of 3 for the face and 70 mJ and a density of 2 for off the face. The DeepFXTM platform will be applied to the scar prior to the ActiveFX TM platform. Half of the excision scar will be treated with the appropriate settings and half will go untreated.<br>* Other names: Lumenis UltraPulse Total FXTM fractionated CO2 laser;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| MMSS for Scar Halves Treated | modified Manchester scar scale (MMSS) treated - Full scale from 5 to 18, with higher score indicating lower health outcomes | Day 0 and Day 14 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Quantitative Scar Analysis as Measured by Fractal Dimension (Fd) and Lacunarity | Fd indicates scar tissue density - a measure of how completely an object fills space and increases in value with increasing structural density. It has a value between 1 and 2: a minimum value of 1 corresponds to a straight line filling the space, and a maximum value of 2 corresponds to an object completely occupying the entire space. Lacunarity describes the characteristics of fractals of the same dimension with different texture appearances and indicates scar tissue architecture (homogeneous vs. heterogeneous) - a measure of the nonuniformity (heterogeneity) of a structure or the degree of structural variance within an object. L has a value between 0 and 1, where a minimum value of 0 corresponds to an absolute homogeneous object. | Day 0 and Day 14 | 
| Quartile Scale | Comparison of scars using quartile scale: 0 indicates no difference, 1 indicates a 1-25% difference or mild difference, 2 indicates a 26-50% or moderate difference, 3 indicates a 51-75% or significant improvement and 4 indicates a 76-100% difference or very significant. | 24 weeks post-op | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Mohs, scar, post excision, CO2 laser, laser, skin cancer, resurfacing