A new method for using a silicone rod for permanent nipple projection after breast reconstruction procedures

Long-Term Maintenance of Projection of Nipples Reconstructed Using Three-Dimensionally Printed Poly-4-Hydroxybutyrate Bioabsorbable Scaffolds

BACKGROUND

For patients who are unable to undergo nipple-sparing mastectomy, reconstruction of the nipple-areola complex has been shown to promote greater satisfaction in cosmetic outcome, body image, and sexual relationships. Although a variety of techniques have been developed to optimize the shape, size, and mechanical properties of the reconstructed nipple-areola complex, maintenance of sustained nipple projection over time remains a challenge for plastic surgeons.

METHODS

Three-dimensionally printed poly-4-hydroxybutyrate (P4HB) scaffolds were designed and fabricated filled with either mechanically minced or zested patient-derived costal cartilage, designed with an internal P4HB lattice (rebar) to provide interior structure to foster tissue ingrowth, or left unfilled. All scaffolds were wrapped within a C-V flap on the dorsa of a nude rat.

RESULTS

One year after implantation, neonipple projection and diameter were well preserved in all scaffolded groups compared with nonscaffolded neonipples ( P < 0.05). Histologic analysis showed significant vascularized connective tissue ingrowth at 12 months in both empty and rebar-scaffolded neonipples and fibrovascular cartilaginous tissue formation in mechanically processed costal cartilage-filled neonipples. The internal lattice promoted more rapid tissue infiltration and scaffold degradation and best mimicked the elastic modulus of the native human nipple after 1 year in vivo. No scaffolds extruded or caused any mechanical complications.

CONCLUSIONS

Three-dimensionally printed biodegradable P4HB scaffolds maintain diameter and projection while approximating the histologic appearance and mechanical properties of native human nipples after 1 year with a minimal complication profile. These long-term preclinical data suggest that P4HB scaffolds may be readily translated for clinical application.

CLINICAL RELEVANCE STATEMENT

The authors' unique, three-dimensionally printed P4HB scaffolds can be used to create custom nipple scaffolds that contour to any nipple shape and size, enabling the fabrication of tissue-engineered neonipples with significantly greater projection maintenance and closely approximating desired nipple biomechanical properties.

Acellular Nipple Scaffold Development, Characterization, and Preliminary Biocompatibility Assessment in a Swine Model

BACKGROUND

The standard in nipple reconstruction remains the autologous skin flap. Unfortunately, the results are not satisfying, with up to 75% loss of nipple projection over time. Existing studies investigated the use of primates as a source of implants. The authors hypothesized that the porcine nipple can serve as a perfect shape-supporting implant because of functional similarities to the human nipple. A decellularization protocol was developed to obtain an acellular nipple scaffold (ANS) for nipple reconstruction.

METHODS

Tissue samples were collected from eight disease-free female Yorkshire pigs (60 to 70 kg) and then decellularized. The decellularization efficiency and extracellular matrix characterization was performed histologically and quantitatively (DNA, total collagen, elastin, and glycosaminoglycan content). In vitro and in vivo biocompatibility was determined by human dermal fibroblast culture and subcutaneous implantation of six ANSs in a single Yorkshire pig (60 to 70 kg), respectively. Inflammation and adverse events were monitored daily based on local clinical signs.

RESULTS

The authors showed that all cellular structures and 96% of DNA [321.7 ± 57.6 ng DNA/mg wet tissue versus 11.7 ± 10.9 ng DNA/mg wet tissue, in native and ANS, respectively ( P < 0.001)] can be successfully removed. However, this was associated with a decrease in collagen [89.0 ± 11.4 and 58.8 ± 9.6 μg collagen/mg ( P < 0.001)] and elastin [14.2 ± 1.6 and 7.9 ± 2.4 μg elastin/mg ( P < 0.05)] and an increase in glycosaminoglycan content [5.0 ± 0.7 and 6.0 ± 0.8 ng/mg ( P < 0.05)]. ANS can support continuous cell growth in vitro and during preliminary biocompatibility tests in vivo.

CONCLUSION

This is a preliminary report of a novel promising ANS for nipple reconstruction, but more research is needed to validate results.

CLINICAL RELEVANCE STATEMENT

Breast cancer is very common among women. Treatment involves mastectomy, but its consequences affect patient mental well-being, and can lead to depression. Nipple-areola complex reconstruction is critical, and existing methods lead to unsatisfactory outcomes.

3D-printed poly-4-hydroxybutyrate bioabsorbable scaffolds for nipple reconstruction

Nearly all autologous tissue techniques and engineered tissue substitutes utilized for nipple reconstruction are hindered by scar contracture and loss of projection of the reconstructed nipple. The use of unprocessed costal cartilage (CC) as an internal support for the reconstructed nipple has not been widely adopted because of the excessively firm resultant construct. Herein we use a 3D-printed Poly-4-Hydroxybutyrate (P4HB) bioabsorbable scaffold filled with mechanically processed patient-derived CC to foster ingrowth of tissue in vivo to protect the regenerated tissue from contractile forces as it matures. After 6 months in vivo, newly formed spongy fibrovascular cartilaginous tissue was noted in processed CC filled 3D-printed scaffolds, which maintained significantly greater projection than reconstructions without scaffolds. Interestingly, 3D-printed P4HB scaffolds designed with an internal 3D lattice of P4HB filaments (without CC) displayed the fastest material absorption and vascularized adipose-fibrous tissue as demonstrated by SEM and histological analysis, respectively. Using 3D-printed P4HB scaffolds filled with either processed CC, a 3D P4HB lattice or no fills, we have engineered neo-nipples that maintain projection over time, while approximating the biomechanical properties of the native human nipple. We believe that this innovative 3D-printed P4HB nipple reconstruction scaffold will be readily translatable to the clinic. STATEMENT OF SIGNIFICANCE: Nearly all autologous tissue techniques and engineered tissue substitutes utilized for nipple reconstruction are hindered by scar contracture and substantial loss of projection of the reconstructed nipple, leading to significant patient dissatisfaction. Using 3D-printed P4HB scaffolds filled with either processed costal cartilage or 3D P4HB lattices, we have engineered neo-nipples that resist the forces induced by scar contracture, resulting in maintenance of neo-nipple projection over time and biomechanically approximating human nipples after 6 months in vivo implantation. This novel 3D-printed bioabsorbable P4HB scaffold will be readily translatable to the clinic to reconstruct nipples with patient-specific dimensions and long-lasting projection.

Dual Extrusion Patterning Drives Tissue Development Aesthetics and Shape Retention in 3D Printed Nipple-Areola Constructs

Breast cancer and its most radical treatment, the mastectomy, significantly impose both physical transformations and emotional pain in thousands of women across the globe. Restoring the natural appearance of a nipple-areola complex directly on the reconstructed breast represents an important psychological healing experience for these women and remains an unresolved clinical challenge, as current restorative techniques render a flattened disfigured skin tab within a single year. To provide a long-term solution for nipple reconstruction, this work presents 3D printed hybrid scaffolds composed of complementary biodegradable gelatin methacrylate and synthetic non-degradable poly(ethylene) glycol hydrogels to foster the regeneration of a viable nipple-areola complex. In vitro results showcased the robust structural capacity and long-term shape retention of the nipple projection amidst internal fibroblastic contraction, while in vivo subcutaneous implantation of the 3D printed nipple-areola demonstrated minimal fibrotic encapsulation, neovascularization, and the formation of healthy granulation tissue. Envisioned as subdermal implants, these nipple-areola bioprinted regenerative grafts have the potential to transform the appearance of the newly reconstructed breast, reduce subsequent surgical intervention, and revolutionize breast reconstruction practices.

Guiding Nipple-Areola Complex Reconstruction: Literature Review and Proposal of a New Decision-Making Algorithm

BACKGROUND

Nipple-areola complex reconstruction (NAR) most commonly represents the finishing touch to breast reconstruction (BR). Nipple presence is particularly relevant to the patient's psyche, beyond any shadow of doubt. Many reconstructive options have been described in time. Surgery is easy, but final result is often disappointing on the long run.

METHODS

The goal of this manuscript is to analyze and classify knowledge concerning NAR techniques and the factors that influence success, and then to elaborate a practical evidence-based algorithm. Out of the 3136 available articles as of August 8th, 2020, we selected 172 manuscripts that met inclusion criteria, which we subdivided into 5 main topics of discussion, being the various NAR techniques; patient factors (including patient selection, timing and ideal position); dressings; potential complications and finally, outcomes/patient satisfaction.

RESULTS

We found 92 articles describing NAR techniques, 41 addressing patient factors (out of which 17 discussed patient selection, 14 described ideal NAC location, 10 described appropriate timing), 10 comparing dressings, 7 studying NAR complications, and 22 addressing outcomes and patient satisfaction. We elaborated a comprehensive decision-making algorithm to help narrow down the choice among NAR techniques, and choose the correct strategy according to the various scenarios, and particularly the BR technique and skin envelope.

CONCLUSIONS

No single NAR technique provides definitive results, which is why we believe there is no "end-all be-all solution". NAR must be approached as a case-by-case situation. Furthermore, despite NAR being such a widely discussed topic in scientific literature, we still found a lack of clinical trials to allow for more thorough recommendations to be elaborated.

LEVEL OF EVIDENCE III

This journal requires that authors assign a level of evidence to each submission to which Evidence-Based Medicine rankings are applicable. This excludes Review Articles, Book Reviews, and manuscripts that concern Basic Science, Animal Studies, Cadaver Studies, and Experimental Studies. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266.

Nipple-Areola Complex Reconstruction

The reconstruction of the nipple–areola complex is the last step in the breast reconstruction process. Several techniques have been described over the years. The aim of this review is to provide clarity on the currently available reconstructive options.

Nipple Reconstruction: A Regenerative Medicine Approach Using 3D-Printed Tissue Scaffolds

IMPACT STATEMENT

This work provides a comprehensive overview and critique of nipple reconstruction techniques to date. It then explores different tissue engineering concepts and how these may improve clinical outcomes for patients undergoing nipple reconstruction. A novel technique is proposed, whereby a three-dimensional-printed tissue-engineered construct is used as an autologous graft to assist nipple reconstruction.

A Nipple-Areolar Complex Reconstruction in Implant-Based Breast Reconstruction Using a Local Flap and Full-Thickness Skin Graft

INTRODUCTION

Nipple-areolar complex reconstruction is the final step of the reconstructive procedure in breast cancer patients. Nowadays, a combination of a local flap for nipple reconstruction and skin grafting or tattooing for areola reconstruction is deemed a first choice. In this paper, we are combining the techniques of local flap and full-thickness skin graft from the upper inner thigh for simultaneous reconstruction of the nipple and areola.

PATIENTS AND METHODS

From January, 2016 to December, 2017, 23 female patients with an absent unilateral nipple-areolar complex due to post-oncological mastectomy and immediate implant-based breast reconstruction were subjects of the study. On an out-patient clinic basis, the percentage of the nipple projection loss was calculated at the intervals of 3 , 6 and 12 months postoperatively. At the final visit, the patient's subjective satisfaction on the reconstructed areola compared to the normal contralateral side was evaluated using a visual analogue scale.

RESULTS

Over the course of time, the mean nipple projection loss was 20.16 ± 12.88, 31.78 ± 11.63 and 34.69 ± 12.01% at 3 , 6 and 12 months postoperatively, respectively. Patients' overall satisfaction on the grafted areola was as follows; the largest number of patients (8 patients) had a 'good' satisfaction 12-months postoperatively. Out of 21 patients, those who considered the result to be 'poor' and 'disappointing' each accounted for 1 and 3 patients.

CONCLUSION

The combination of nipple-areolar complex reconstruction technique introduced in this study has proven to be a safe and efficacious alternative in patients with implant-based reconstruction requiring small- to medium-sized nipple projection, especially when the skin envelope is too tight for a local flap only.

LEVEL OF EVIDENCE IV

This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

Nipple Reconstruction After Autologous or Expander Breast Reconstruction: A Multimodal and 3-Dimensional Analysis

BACKGROUND

Little is known about the influence of the underlying tissue as donor for nipple-areola complex (NAC) reconstruction. Also, there is a complete lack of knowledge about the fate of nipple volume.

OBJECTIVES

The goal of this retrospective, single-institution study was to analyze a case series after nipple reconstruction using a multimodal evaluation including 3-dimensional (3D) laser scanner analyses.

METHODS

Unilateral mastectomy patients after either expander-based or autologous breast reconstruction using the skate flap were included. NAC caliper measurement of nipple and areola size was performed. 3D laser scanner analysis (Minolta Vivid 900) was used to calculate nipple volume, measurement of nipple, and areolar projection and diameter. Sensitivity was evaluated using the Semmes Weinstein test and patient satisfaction by a visual analog scale (VAS 1-10).

RESULTS

A total of 10 patients were included in the expander group and 12 patients were included in the flap group. After a median follow-up period of 32 months in the expander group and 34 months in the flap group, non-contact 3D laser surface scanning revealed a difference in projection of 55 to 60% compared to the contralateral side. The contraction in all 3 dimensions led to a dramatic difference in nipple volume with 12 ± 8% (flap reconstructions) and 12 ± 7% (expander reconstructions). Sensitivity of the areola showed better values after expander-based reconstruction. Despite the significant discrepancy in nipple volume and projection as well as areolar diameter, overall patient satisfaction was acceptable (VAS 4.1 ± 3.5).

CONCLUSIONS

Volume assessment revealed a massive asymmetry to the intact nipple but not between expander and flap reconstructions. Although asymmetry of the areola and nipple remains, patient satisfaction is acceptable. LEVEL OF EVIDENCE 4.

A Systematic Review of Comparison of Autologous, Allogeneic, and Synthetic Augmentation Grafts in Nipple Reconstruction

BACKGROUND

Many techniques have been described for nipple reconstruction, with the principal limitation being excessive loss of projection. The ideal reconstructed nipple provides sustained projection, the fewest complications, and high levels of patient satisfaction. A variety of materials are available for projection augmentation, including autologous, allogeneic, and synthetic materials. To date, there has been no systematic review to study the efficacy, projection, and complication rates of different materials used in nipple reconstruction.

METHODS

MEDLINE, Embase, and PubMed databases were searched, from inception to August of 2014, to identify literature reporting on outcomes of autologous, allogeneic, and synthetic grafts in nipple reconstruction. Retrospective and prospective studies with controlled and uncontrolled conditions were included. Studies reporting the use of autologous flap techniques without grafts and articles lacking postoperative outcomes were excluded. Study quality was assessed using the Newcastle-Ottawa Scale.

RESULTS

Thirty-one studies met the inclusion criteria. After evidence review, one study represented two of nine stars on the Newcastle-Ottawa Scale, two studies represented three stars, six studies represented four stars, seven studies represented five stars, 11 studies represented six stars, and four studies represented seven stars.

CONCLUSIONS

The results of this review revealed heterogeneity in the type of material used within each category and inconsistent methodology used in outcomes assessment in nipple reconstruction. Overall, the quality of evidence is low. Synthetic materials have higher complication rates and allogeneic grafts have nipple projection comparable to that of autologous grafts. Further investigation with high-level evidence is necessary to determine the optimal material for nipple reconstruction.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, IV.

Nipple-areola complex reconstruction techniques: A literature review

Many techniques for nipple-areola complex (NAC) reconstruction are described. Clarity is required on the currently available options. Since a complete list of all the techniques described until now is not available, a possibly comprehensive literature overview was carried out from 75 papers (years 1946-2015). The local flap was the most frequently described technique for the nipple reconstruction with no significant difference in complications' rate among the various types of techniques. Complications in nipple reconstruction were 46.9% after graft, 7.9% after local flap, and 5.3% in case of flaps with autologous graft/alloplastic/allograft augmentation, while complications in areola reconstruction were 10.1% after graft, and 1.6% after areola tattoo. Flaps appear to be more reliable than grafts in nipple reconstruction, while tattoo is thought to be safer than graft in areola reconstruction. The loss of projection, although considerable (45%-75%), had not significant impact on patients' satisfaction. Due to contraction, overcorrection of 25-50% of the desired result is advisory when adopting local flaps, in order to prevent loss of projection. The use of flaps with autologous graft/alloplastic/allograft augmentation (cartilage, fat, calcium hydroxylapatite, acellular dermal matrix, polymethylmethacrylate, biologic collagen) showed a minor loss of nipple projection but may expose to a relative increased number of postoperative flap necrosis.

Biologic collagen cylinder with skate flap technique for nipple reconstruction

A surgical technique using local tissue skate flaps combined with cylinders made from a naturally derived biomaterial has been used effectively for nipple reconstruction. A retrospective review of patients who underwent nipple reconstruction using this technique was performed. Comorbidities and type of breast reconstruction were collected. Outcome evaluation included complications, surgical revisions, and nipple projection. There were 115 skate flap reconstructions performed in 83 patients between July 2009 and January 2013. Patients ranged from 32 to 73 years old. Average body mass index was 28.0. The most common comorbidities were hypertension (39.8%) and smoking (16.9%). After breast reconstruction, 68.7% of the patients underwent chemotherapy and 20.5% underwent radiation. Seventy-one patients had immediate breast reconstruction with expanders and 12 had delayed reconstruction. The only reported complications were extrusions (3.5%). Six nipples (5.2%) in 5 patients required surgical revision due to loss of projection; two patients had minor loss of projection but did not require surgical revision. Nipple projection at time of surgery ranged from 6 to 7 mm and average projection at 6 months was 3-5 mm. A surgical technique for nipple reconstruction using a skate flap with a graft material is described. Complications are infrequent and short-term projection measurements are encouraging.