Short-Term Surgical Complications of Skin-Sparing Mastectomy and Direct-to-Implant Immediate Breast Reconstruction in Women Concurrently Treated with Adjuvant Radiotherapy for Breast Cancer

Advantages of immediate implant-based breast reconstruction over delayed breast reconstruction in women treated with postmastectomy radiotherapy for breast cancer

PURPOSE

To compare immediate with delayed breast reconstruction in the setting of postmastectomy radiotherapy (PMRT) in terms of the total number of interventions and time required for breast cancer clearance and contour restoration.

METHODS

The long-term prevalence and number of plannable and urgent interventions required in women receiving PMRT to finish 372 nipple-sparing or skin-sparing mastectomies combined with immediate implant-based breast reconstruction ([N]SSM/IIBR) were compared to those required for 18 mastectomies and delayed breast reconstruction (DBR) performed between 2013 and 2019.

RESULTS

Re-interventions were required in 239 of the 372 breasts (64%) after [N]SSM/IIBR, whereas all 18 DBRs (100%) implicitly required at least one re-intervention (p < 0.001). Mastectomy and reconstruction necessitated a mean of 2.24 interventions per breast after [N]SSM/IIBR, which was significantly less than the mean of 3.72 interventions per breast after DBR (p < 0.001). Breast contour reconstruction was achieved in 14.3 months after [N]SSM/IIBR and in 38.6 months after DBR (p < 0.001). [N]SSM/IIBR required more class U3 urgent re-interventions than DBR (22% vs. 4%, p = 0.002), whereas DBR necessitated more class P3 plannable re-interventions (5% vs. 16%, p = 0.004). Initiation of PMRT is not postponed after [N]SSM/IIBR (10.1 weeks) compared to DBR (14.0 weeks).

CONCLUSIONS

Women potentially needing PMRT should be informed pre-operatively that [N]SSM/IIBR with PMRT may be associated with 22% severe complications and 8% failure. Still, [N]SSM/IIBR prior to PMRT required less interventions and was less time-consuming than DBR following PMRT. Therefore, the potential need of re-interventions should not be the reason for refraining from [N]SSM/IIBR in these women.

Long-Term Outcomes of 1989 Immediate Implant-Based Breast Reconstructions: An Analysis of Risk Factors for Failure and Revision Surgery

BACKGROUND

Nipple- or skin-sparing mastectomy and immediate implant-based breast reconstruction (IBR) is potentially associated with long-term unfavorable outcomes, such as revision surgery and reconstruction failure. This large patient cohort study aimed to provide long-term data on the incidence of these outcomes and to identify predictive risk factors.

METHODS

Between 2012 and 2019, 1989 mastectomies with IBR were performed in 1512 women in the authors' institute. A direct-to-implant method was used in 93% and a 2-staged method with tissue expander in 7%. Logistic regression analysis was used to identify patient- and treatment-related risk factors associated with revision surgery or reconstructive failure.

RESULTS

The mean follow-up was 62.2 months. IBR failed in 6.7% of all breasts; thus, a breast was present in 93.3%. Age older than 44 years yielded a 2.6-fold, and radiotherapy, a 1.7-fold increased risk for reconstruction failure. Revision surgery was performed in 60% of all breasts. The mean number of revisions of all IBRs was 1.2 (range, 0 to 8; SD, 1.37). Factors associated with significantly higher rates of revision surgery were age older than 44 years (OR, 1.23), smoking (OR, 1.53), specimen weight greater than 492 g (OR, 1.39), implant volume greater than 422 g (OR, 1.95), and radiotherapy (OR, 1.51). Nipple preservation was protective for both outcomes (OR, 0.71 and 0.42, respectively). Direct-to-implant procedures did not require any surgical revision in 43% of these patients.

CONCLUSIONS

Despite the necessity of revision surgery in the majority of IBRs, nearly half of the breasts did not require any revision surgery, and long-term reconstruction failure rates are extremely low. Therefore, IBR should be offered to all eligible women undergoing mastectomy, while understanding the risks.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Risk, III.

Increasing Rates but Persistent Variability of Immediate Breast Reconstruction: Real-Time Data from a Population-Based Study (2012-2022)

INTRODUCTION

Preserving the breast contour after mastectomy is proven to be beneficial for the quality of life of a large group of patients with breast cancer (BC). The aim of the present study is to provide an up-to-date overview of immediate breast reconstruction (IBR) in hospitals in the Netherlands over the past 10 years.

PATIENTS AND METHODS

Nationwide data of patients with BC who underwent a mastectomy for ductal carcinoma in situ (DCIS) or invasive BC between January 2012 and September 2022 were requested from the Dutch Breast Cancer Audit (NBCA). Primary outcome was the incidence and trend in application of IBR. Secondary outcomes were factors associated with the use of IBR and the variation among Dutch hospitals.

RESULTS

In total, 56,164 patients underwent a mastectomy for DCIS (n = 8334) or invasive BC (n = 47,830) (2012-2022). The use of IBR for DCIS increased from 39 in 2012 to 48% in 2022 (2012-2017; range 0-85% and 2018-2021; range 0-83%). For DCIS, age < 50 years and lower DCIS grade were positively associated with IBR. The use of IBR for invasive BC increased from 16 in 2012 to 29% in 2022 (2012-2017; range 0-74%, 2018-2022; range 0-77%). For invasive BC, age < 40 years, neoadjuvant chemotherapy, and no adjuvant radiotherapy were positively associated with IBR.

CONCLUSION

Despite an overall increase of IBR, national variations remain. Further prospective research is initiated ( www.decidestudie.com ) to investigate this variation, which may lead to a more even distribution of IBR use among hospitals in the Netherlands.

Premastectomy Radiotherapy and Immediate Breast Reconstruction: A Randomized Clinical Trial

Importance

Premastectomy radiotherapy (PreMRT) is a new treatment sequence to avoid the adverse effects of radiotherapy on the final breast reconstruction while achieving the benefits of immediate breast reconstruction (IMBR).

Objective

To evaluate outcomes among patients who received PreMRT and regional nodal irradiation (RNI) followed by mastectomy and IMBR.

Design, Setting, and Participants

This was a phase 2 single-center randomized clinical trial conducted between August 3, 2018, and August 2, 2022, evaluating the feasibility and safety of PreMRT and RNI (including internal mammary lymph nodes). Patients with cT0-T3, N0-N3b breast cancer and a recommendation for radiotherapy were eligible.

Intervention

This trial evaluated outcomes after PreMRT followed by mastectomy and IMBR. Patients were randomized to receive either hypofractionated (40.05 Gy/15 fractions) or conventionally fractionated (50 Gy/25 fractions) RNI.

Main Outcome and Measures

The primary outcome was reconstructive failure, defined as complete autologous flap loss. Demographic, treatment, and outcomes data were collected, and associations between multiple variables and outcomes were evaluated. Analysis was performed on an intent-to-treat basis.

Results

Fifty patients were enrolled. Among 49 evaluable patients, the median age was 48 years (range, 31-72 years), and 46 patients (94%) received neoadjuvant systemic therapy. Twenty-five patients received 50 Gy in 25 fractions to the breast and 45 Gy in 25 fractions to regional nodes, and 24 patients received 40.05 Gy in 15 fractions to the breast and 37.5 Gy in 15 fractions to regional nodes, including internal mammary lymph nodes. Forty-eight patients underwent mastectomy with IMBR, at a median of 23 days (IQR, 20-28.5 days) after radiotherapy. Forty-one patients had microvascular autologous flap reconstruction, 5 underwent latissimus dorsi pedicled flap reconstruction, and 2 had tissue expander placement. There were no complete autologous flap losses, and 1 patient underwent tissue expander explantation. Eight of 48 patients (17%) had mastectomy skin flap necrosis of the treated breast, of whom 1 underwent reoperation. During follow-up (median, 29.7 months [range, 10.1-65.2 months]), there were no locoregional recurrences or distant metastasis.

Conclusions and Relevance

This randomized clinical trial found PreMRT and RNI followed by mastectomy and microvascular autologous flap IMBR to be feasible and safe. Based on these results, a larger randomized clinical trial of hypofractionated vs conventionally fractionated PreMRT has been started (NCT05774678).

Trial Registration

ClinicalTrials.gov Identifier: NCT02912312.

Oncological status is not a determinant of refraining from breast reconstruction among 490 candidates for mastectomy and post-mastectomy radiotherapy

BACKGROUND

Although breast reconstruction in the setting of post-mastectomy radiotherapy (PMRT) is controversial, we offer nipple-sparing mastectomy and immediate implant-based breast reconstruction ([N]SSM/IIBR) to women needing primary mastectomy regardless of PMRT. Nevertheless, some of these women have no reconstruction.

PURPOSE

To assess the uptake of breast reconstruction in women who undergo PMRT and the patient characteristics associated with such uptake. Additionally, we assessed the determinants of forgoing breast reconstruction.

METHODOLOGY

Demographic, physical and oncological characteristics of women who underwent mastectomy, PMRT and breast reconstruction were compared to the characteristics of those who did not undergo breast reconstruction from 2013 through 2018. As determinants of delaying or refraining from breast reconstruction, we distinguished between an oncological reason, patient's preference, patient's co-morbidity, combined tobacco abuse and obesity and the need for PMRT.

RESULTS

490 women received PMRT. Of these, 396 women (81%) underwent combined [N]SSM/IIBR and PMRT or mastectomy and PMRT with delayed breast reconstruction. Ninety-four additional women (19%) did not undergo breast reconstruction. The latter group differed significantly from those who did in demographic and physical characteristics but not in terms of oncological diagnosis and history. Patient's preference was the single most frequent determinant of not performing either immediate or delayed breast reconstruction among these 94 women. Oncological status was not a major determinant in refraining from reconstruction.

CONCLUSION

The significant difference in non-oncological characteristics between the reconstructed and non-reconstructed women confirms the importance of these characteristics in the preference for either reconstruction or non-reconstruction.