The use of human acellular dermal matrices in irradiated breast reconstruction

Bovine Acellular Dermal Matrix-Based Breast Reconstruction in Previously Irradiated Breasts: Complications and Outcomes From a Single-Center Experience

ABSTRACT

Radiation therapy is considered today an integral part of the management of breast cancer. However, radiotherapy significantly increases the incidence of total complications in breast reconstruction. Several procedures have been adopted to reduce complication rates in irradiated fields, including the use of acellular dermal matrices (ADMs). We conducted a retrospective analysis of our single-center experience with ADM-assisted implant-based reconstruction or revision surgeries for capsular contracture treatment in irradiated breasts. We divided our population into 4 groups based on prior surgical history: group A (previous quadrantectomy), group B (previous mastectomy and expander reconstruction), group C (previous mastectomy and implant reconstruction), and group D (prior quadrantectomy followed by mastectomy and implant reconstruction). At the European Oncology Institute in Milan, Italy, between June 2017 and April 2019, we identified 84 patients for a total of 86 irradiated breasts reconstructed with implant and ADM. We observed a total of 12 reconstructive failure, with the highest rate of failure in group B (16.6%) and in group D (15.38%). Overall, we recorded 22 total complications (24.4%): 12 major complications and 10 minor complications. The most common complication was infection, with 9 cases (10.4%), 6 of which were classified as severe and required implant removal. In group B, we observed the highest complication rate, both major and minor, with 7 of 42 patients (16.6%) experiencing each. Before reconstruction with ADM, the Baker grade ranged from 3 to 4, with a mean of 3.25. At the 2-year follow-up, the Baker grade ranged from 1 to 4, with a mean of 1.9. Surgeons were highly satisfied with the aesthetic result in 72.1% of cases, moderately in 8.1% and unsatisfied in 5.81%, and in 13.9%, the outcome was not assessable because of reconstructive failure. The worst aesthetic result was in group B. We observed significant reduction in capsular contracture in revision surgeries despite a moderately high rate of complications in previous quadrantectomy and radiotherapy. In our experience, breast reconstruction with implant and ADM is not the primary surgical indication in case of prior irradiation, but it can be considered as a valid alternative with reasonable safety profile, to be used in selected cases.

Acellular dermal matrices in breast reconstructions - a literature review

During the last two decades, acellular dermal matrices (ADM) have been more widely used in reconstructive procedures i.e. breast reconstructions. Several, both synthetic and biologic products derived from human, porcine and bovine tissue, have been introduced. Until this point postoperative complications for the acellular dermal matrices, as a group, have been the main focus. The purpose of this literature review is to summarize the current knowledge on the each biologic product used in breast reconstructions, including product specific complication frequencies. A systematic search of the literature was performed in the PubMed and EMBASE databases, identifying 55 relevant articles, mainly evidence level III. AlloDerm seems to be associated with severe complicating matters in the reconstructive process compared to other products. This could be due to the higher number of investigating studies relative to the others. The surgical area faces certain challenges comparing results, due to surgical variance, the data collection and follow-up. More well-defined guidelines and more high-evidence randomized studies could increase the overall level of evidence in this area.

Acellular dermal matrices and radiotherapy in breast reconstruction: a systematic review and meta-analysis of the literature

The increasing use of commercially available acellular dermis matrices for postmastectomy breast reconstruction seems to have simplified the surgical procedure and enhanced the outcome. These materials, generally considered to be highly safe or with only minor contraindications due to the necessary manipulation in preparatory phases, allow an easier one-phase surgical procedure, in comparison with autologous flaps, offering a high patient satisfaction. Unfortunately, the claim for a higher rate of complications associated with irradiation at the implant site, especially when the radiation therapy was given before the reconstructive surgery, suggested a careful behaviour when this technique is preferred. However, this hypothesis was never submitted to a crucial test, and data supporting it are often discordant or incomplete. To provide a comprehensive analysis of the field, we searched and systematically reviewed papers published after year 2005 and registered clinical trials. On the basis of a meta-analysis of data, we conclude that the negative effect of the radiotherapy on the breast reconstruction seems to be evident even in the case of acellular dermis matrices aided surgery. However, more trials are needed to make solid conclusions and clarify the poor comprehension of all the factors negatively influencing outcome.