The Impact of N-Acetylcysteine on Volumetric Retention of Autologous Fat Graft for Breast Asymmetry Correction

Study Overview
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Brief Summary
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The aim of this study is to assess the effect of new tumescent solution for liposuction containing N-Acetylcysteine (Pietruski solution) on the autologous fat graft volumetric retention used for healthy women breast asymmetry correction by means of lipofilling.

Detailed Description
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Lipofilling is the process of relocating autologous fat to change the volume, shape, and profile of tissues. It is considered a simple, inexpensive and minimally invasive technique indicated for both congenital and acquired soft tissue defects in many sites. Success is heavily dependent on the harvesting technique, preparing and injection of the fat. The main limitation of the abovementioned surgical procedure is a loss of transplanted adipose tissue which is believed to be caused mainly by cells injury in oxidative, ischemic, and mechanical stress mechanism. High graft resorption rate results in undercorrection and requirement for multiple-stage treatment. The aim of this study is to assess the effect of new tumescent solution for liposuction containing N-Acetylcysteine (NAC) on the autologous fat graft volumetric retention used for healthy women breast asymmetry correction by means of lipofilling. NAC reduces free radicals using a sulfhydryl chemical group. In authors opinion, this antioxidant effect may decrease oxidative stress experienced by adipose graft cells during the harvest procedure, therefore potentially improving the long-term survivability of the fat graft, lowering the number of re-operations and even maybe the total volume of fat graft needed to achieve satisfactory results. The results of this study may justify the usage of novel tumescent solution (Pietruski solution) for autologous adipose tissue graft harvest in the routine clinical setting. The subjects for this project will consist of the group of women who are candidates for hypoplastic, asymmetric breasts correction with at least two-staged lipofilling procedure. The bilateral character of such defect allows for each patient to serve as her own control. In the first lipofilling procedure one breast will be enlarged with autologous fat graft harvested from one thigh region after its infiltration with Pietruski solution. The contralateral breast will be enlarged with adipose tissue collected from contralateral thigh area by performing lipoaspiration after standard tumescent solution infiltration. Only the first stage of breasts defect correction is included in this study. Additional, future lipofilling procedures will utilize fat graft obtained with a standard tumescent solution only. The hypothesis that addition of NAC to the tumescent solution used for the fat graft harvest procedure will decrease its long-term resorption in breast region will be tested in comparison to the fat graft obtained with liposuction using standard tumescent solution. For each subject, a breast magnetic resonance imaging (MRI) will be performed before and six months after the first fat graft transfer enabling quantitative, volumetric analysis of the transplanted adipose tissue resorption. In addition, a volume of 50 ml of each harvested fat graft will be intended for genetic and immunohistochemical analysis. The results will be compared using two-tailed t-tests with statistical significance set at p<0.05. The study will be conducted at the Plastic Surgery Department, Centre of Postgraduate Medical Education, Warsaw, Poland.

Official Title
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The Impact of N-Acetylcysteine on Volumetric Retention of Autologous Fat Graft for Breast Asymmetry Correction

Conditions
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Breast; Deformity, Congenital, Graft Loss, Adipose Tissue Atrophy, Breast; Atrophy

Intervention / Treatment
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* Drug: N-Acetylcysteine (NAC)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Female Age 18-40 years BMI > 20 Breasts asymmetry (including tuberous breasts deformity) with indications for treatment with autologous fat grafting ASA PS I Exclusion Criteria: Asthma A history of allergic reaction to NAC Peptic ulcer disease Contraindications to MRI imaging A history of breast surgery or radiotherapy A history of hip/thigh surgery or injury Breastfeeding, pregnancy or planned pregnancy within a year Ilness or general state of health precluding general anesthesia

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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Female

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: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: N-Acetylcysteine (NAC)<br>Breast enlargement with autologous fat graft obtained by liposuction with Pietruski solution (tumescent solution with NAC). | Drug: N-Acetylcysteine (NAC)<br>* For more information read Experimental Arm description<br>* Other names: Acetylcysteine;|
| No Intervention: Control<br>Contralateral breast enlargement with autologous fat graft obtained by liposuction with standard tumescent solution. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Autologous fat graft volumetric analysis | Volumetric analysis of fat graft six months after operation (postoperative breast adipose tissue volume in comparison to preoperative volume). | 6 months following the intervention in the last enrolled participant | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Intraoperative complications | Any complication that occurred during the lipofilling procedure. | During intervention (operation) | 
| Postoperative complications | Any complication or adverse effect of the lipofilling procedure that occurred in the six-month time frame following the operation. | 6 months following the intervention | 
| Immunohistochemical and genetic analysis of lipoaspirates. | A volume of at least 50 ml of each harvested fat graft (control tumescent solution vs Pietruski tumescent solution) will be intended for genetic and immunohistochemical analysis. The immediate analysis will include oxidative stress markers quantification (Nitric Oxide, Superoxide dismutase, Reactive Oxygen Species), dead cell count evaluation (flow cytometry) and RNA isolation for the future qRT-PCR analysis of chosen targets expression related to cells' stress response. Additional, an attempt will be taken to isolate adipose-derived stem cells (ASC) from each lipoaspirate for the purpose of hydrogen peroxide exposure test, ELISA test, flow cytometry, Colony Forming Unit-Fibroblastic Assay (CFU-F) and Cell Proliferation Assay. | Immediately after intervention | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Tuberous breast, Acetylcysteine, Autologous fat grafting, Breast, Deformity, Asymmetry