Of the subjects (26) who had their implants exchanged across all cohorts, only 12 of these implants were associated with the primary augmentation group. The primary reasons for exchange of implants in the primary augmentation cohort were size change (4 implants), malposition (2 implants), and rupture (2 implants) followed by capsular contracture, asymmetry, extrusion, and pain. Regarding the revision augmentation cohort, 11 implants were exchanged in total, 4 due to size change, 3 for asymmetry, and 2 for capsular contracture and wrinkling (2 implants). Implants were exchanged in the primary reconstruction cohort for another device due to capsular contracture, asymmetry, and shape involving 4, 3, and 2 implants, respectively. Problems identified in the revision reconstruction cohort involved pinched implants and asymmetry (3 implants).
The main reasons for implant removal without replacement were performed for women who developed breast cancer (6 implants) followed by size change (2 implants), ptosis (2 implants), infection (1 implant but bilateral explantation performed), and malposition (1 implant). Of the implants associated with subjects diagnosed with breast cancer, 1 of these patients had prior implant surgery (revision augmentation) and 2 of the remaining patients had their implants removed within less than a month after implantation due to diagnosis of the disease. The cumulative Kaplan-Meier risk for implant removal (definitive explantation) in each of the individual cohorts was 8.5% in primary augmentation, 14.7% in primary reconstruction, 22.9% in revision augmentation, and 15.2% in revision reconstruction groups.
Of the 1010 prostheses implanted, only 1 implant was found to be ruptured upon clinical examination. Another implant ruptured subject to mechanical trauma during explantation. Although implant imaging was not a requirement of the protocol, just over 50% of patients had a least 1 form of imaging performed on a routine basis [32%, 19%, and 2% of patients had at least 1 mammography, ultrasound, and magnetic resonance imaging (MRI), respectively]. In fact, the above-mentioned ruptured implant was suspected following mammography and confirmed upon MRI examination/explantation. Additionally, no ruptures were discovered during 35 reoperations. The total Kaplan-Meier risk of rupture was 0.4% per patient.
Capsular Contracture (Baker III/IV)
Of the 534 subjects, 52 women experienced capsular contracture through 5 years. The Kaplan-Meier risk of capsular contracture was 13% (95% CI, 9.5–16.5) on a per subject basis. There was no significant difference in the occurrence of capsular contracture between the individual cohorts analyzed or with incision location utilized.
A breakdown of the number of capsular contractures that were observed according to implant position and incision location is provided in Table 6.
The secondary objectives set out in the protocol related to local complications and may relate to complications occurring as a result of surgery itself rather than the presence of the implants themselves. The Kaplan-Meier risk of both implant and local complications that occurred are presented in Table 3.
Hematoma is a complication often associated with surgery and has been reported following breast implantation. Of the 534 subjects, 18 women presented with hematoma giving Kaplan-Meier risk rates of 3.5% per patient (95% CI, 1.9–5.1%). One woman experienced seroma within 5 years postimplantation while the incidence of infection was low (Table 3).
Wrinkling was observed in 45 women across all cohorts, and the majority of which were associated with the subglandular position (68%). Although the Kaplan-Meier risk associated with wrinkling was higher than expected across individual cohorts (Table 3), reoperation rates for wrinkling were low whereby no patient in the augmentation, primary, and revision reconstruction cohorts were reoperated to correct this complication (Table 4).
Asymmetry was observed and not surprisingly a significantly higher level of asymmetry was reported in both the “reconstruction” and “other” groups when compared with the augmentation group (log-rank Mantel-Cox P < 0.05). Twenty-three of the implants associated with asymmetry were reported to have been malpositioned while 1 implant extruded.
Pain was reported at individual visits and was reported 95 times (60 of which were reported within 12 months). Incidence of pain diminished with time, which is typical of this type of surgery. As pain is often thought to be associated with either incision location or final implant position, secondary analyses were carried out to compare the rate of occurrence of pain. Implantation position did not influence its development (P = not significant); however, the number of reports of pain in association with the transaxillary incision were significantly higher than that observed for the periareolar incision (log-rank Mantel-Cox P < 0.05).
A summary of clinical findings with regard to reproduction and breast feeding complications and autoimmune disease, cancer (new diagnosis and metastatic disease), and benign disease is presented herein.
Connective Tissue Disease, Benign Disease, and Cancer
There were no reports of connective tissue or autoimmune disease. Benign disease was assessed and included adenofibromas, a benign ovarian tumor, and one report of mastocytosis (16 patients within 5 years postimplantation with Kaplan-Meier risk rates of 3.9% per patient; 95% CI, 1.9–5.9%). Cysts and nodules of the breast were reported in 4.3% of all patient cohorts.
Breast cancer has been reported in 10 women where half of these cases involved reconstruction patients. For primary augmentation patients, 5 women were diagnosed with breast cancer (1.4%). Two cases of cervical cancer were reported for women implanted for aesthetic reasons at 4 and 5.5 years, respectively.
Two women in the primary augmentation group reported some issues with breast feeding. One of these experienced the onset of lactogenesis having given birth even though she did not wish to breast feed and capsular contracture was detected in another patient having begun same. Sixteen women reported sensitivity, discomfort, or dysaesthesia in the nipple area (2.9%). No miscarriages were reported.
The risks associated with breast implant placement are common to many types of surgery and include hematoma, seroma, surgical site infection, pain, altered sensitivity, and unfavorable scarring while rupture and capsular contracture are generally considered as problems specific to breast implants.4,5 This study examines 1010 of Eurosilicone’s textured cohesive silicone gel–filled mammary implants through 5 years of follow-up and demonstrates low complication rates consistent with those reported in the literature.
The primary objective of this study was to demonstrate the safety and efficacy of Eurosilicone S.A.S. breast implants for both cosmetic and reconstructive indications specifically through observation of the Kaplan-Meier risk for implant removal (explantation/exchange). Although direct comparisons cannot be made with other competitor studies due to differences in study design and patient profiles, implant removal rates resulting in explantation and exchange were consistently lower than those reported in the literature. Eurosilicone’s 5-year results of removal for their primary augmentation cohorts (8.5%) were lower than the 5-year rates reported by Sientra6 (8.7%) and 4-year results for Allergan (9.6%).7,8 Patients in the primary reconstruction cohort who had undergone reconstruction following cancer diagnosis also showed lower rates when compared with competitor designs (14.7% vs 24.8% and 31% for Allergan and Sientra, respectively).7,8 As such, patients in the reconstructive cohorts typically experience higher implant removal rates than their cosmetic counterparts having undergone significant trauma following mastectomy and adjuvant therapies that could interfere with the healing process (radiotherapy).
Reoperations in the primary augmentation cohort took place mainly for aesthetic reasons (mastopexy, scar, and asymmetry). By contrast, reoperations in the primary reconstruction group that had likely undergone significant tissue trauma were performed for capsular contracture (Kaplan-Meier risk, 5.2%).
Most implants were exchanged due to asymmetry followed by capsular contracture, while the main reason for a definitive explantation was breast cancer. Breast cancer rates were just lower than expected using probability estimated for their current age (5 cases of breast cancer were observed in the aesthetic cohort vs 6.3 expected).9
Despite the fact that more than 50% of patients in Eurosilicone’s study has undergone routine imaging of their breasts (mammography, ultrasound), Eurosilicone have taken the prudent approach and compared their rupture rate to the non-MRI cohorts of competitor premarket approval studies that describe rupture rates varying from 0% to 10% in non-MRI cohorts within 4 years.8,10 Hence, Eurosilicone’s rupture rate of 0.4% is well within the range expected for current designs of mammary implants.
Breast implant surgery can be associated with local complications often as a result of surgery and those associated with breast implant placement. The Kaplan-Meier risk rates associated with wrinkling were higher than expected across all cohorts. The case report form that recorded the data was limited in some respect as it did not require that the severity of complications such as wrinkling or pain were described and are open to criticism. That said, only one patient in the revision augmentation cohort necessitated a reoperation for this complication. It is well documented in the literature that wrinkling is more prevalent in thin patients and implants placed in the subglandular position possibly due to limited tissue coverage.11–14 Hence, it was not surprising, therefore, that wrinkling was reported more frequently in the subglandular rather than submuscular position (45 vs 21 implants), and this result was statistically significant (P ≤ 0.001). Although other manufacturer data report lower Kaplan-Meier risk rates for wrinkling, these data are associated with implants placed mainly in the submuscular position (70% of implants).6,10 Hence, subglandular implant placement may have contributed to the higher apparent wrinkling rates in Eurosilicone’s study. Unfortunately, we cannot provide an insight into the influence of French anatomy or weight loss on the severity of wrinkling due to the data collection mechanism, but it is notable that only one patient required a reoperation for wrinkling and this patient was part of the revision reconstruction cohort. Perhaps, the severity of wrinkling was minimal based on the number of reoperation rates observed. In summary, submuscular placement may offer the most prudent solution for all silicone implant designs.
Pain was the most widely reported local complication in this study which reduced with time postimplantation. Most Eurosilicone implants were placed via a periareolar incision which has been correlated with pain in another study,15 but pain was significantly associated with the transaxillary incision in this series (Log rank P < 0.05). Transaxillary incisions are not widely used due to perceived limitations in pocket access, visualization, control, and subsequent risk for postoperative complications.16 Hence, the correlation of pain with transaxillary incisions in this study may reflect difficulties in the placement and maintenance of implants at the proper level rather than the route of incision itself.17,18
Limitations of the study design derive mainly from the lack of a precise method to assess the level and location of pain,19,20 and it is noteworthy that few patients were reoperated for it (0.3%, primary augmentation; all other cohorts, 0%).
The Kaplan-Meier risk of capsular contracture for Eurosilicone’s augmentation cohorts (primary and revision) was within the range of corresponding 5- to 6-year data presented for successful premarket approval applications of Sientra and Mentor (Sientra Primary revision 8.8%, 5 years; Mentor 15.4%, 6 years, 2003)6,10 but was not influenced by implant position in this series.21,22 Capsular contracture rates in the reconstruction cohorts although higher than cosmetic cohorts were still within the expected range for patients who have had a mastectomy.
Several studies have highlighted that subglandular placement is associated with a higher rate of capsular contracture and need for revision surgery.23,24 Despite an even split between submuscular and subglandular positions, more capsular contractures were associated with the subglandular position in Eurosilicone’s series (41 vs 25 cases) (not significant). Capsular contracture rates although within the range expected may have been slightly elevated due to its more extensive use in this study. Subglandular placement has been often associated with increased complication rates and its development may be more obvious for implants placed in this position.24–27 Perhaps implant duration was fundamental to capsular contracture development in Eurosilicone’s study as rates were significantly lower in the submuscular position at 4 but not at 5 years (Log rank P < 0.05). This phenomenon has also been observed in other long-term studies.28,29
Capsular contracture now considered a multifactorial process that could be influenced by any one or more of the following: surface texture, incision location, implant type, implant location, infection, inflammation, foreign material, hydrophobicity, and biofilm formation.4,21,22,28,30–35 The weight of evidence surrounding the infectious theory is gathering momentum with studies discussing biofilm formation and those highlighting that breast ducts harbor bacteria.33,36 Any correlation between capsular contracture and infection could not be assessed during this study such that capsules were not routinely cultured to assess for subclinical infections/biofilm formation. Literature emphasizing means to reduce inflammation and trauma and thereby capsular contracture through choice of the optimal implant plane, implant size, and shape may also have some merit.21–23,27,36,37
Although a long-term follow-up has not been performed, these 5-year interim results demonstrate the safety and efficacy of Eurosilicone gel–filled mammary implants for both augmentation and reconstruction indications. Reoperation rates resulting in implant removal (explantation/exchange) were low and superior to that described for other implant designs. In agreement with other implant studies, subglandular implant placement was associated with higher complication rates. Concerning local complications, the Kaplan-Meier risk rates for seroma, scarring/hypertrophic scarring, and infection were lower than those reported by competitors.6,8,10 Similarly, rates of implant/displacement extrusion were in line with other manufacturers.6,8,10 This study will continue to evaluate the complication profile of Eurosilicone gel–filled mammary implants until 10 years postimplantation and would be expected to demonstrate an excellent long-term safety and efficacy profile based on these 5-year interim results.
Eurosilicone S.A.S. thanks all the clinical investigators involved in this study and is grateful for their continued support.
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© 2014 American Society of Plastic Surgeons
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