ASO Visual Abstract: Comparing Costs-Does Extreme Oncoplastic Breast-Conserving Surgery Confer a Cost Benefit When Compared with Mastectomy and Reconstruction?

IntroductionExtreme oncoplastic breast-conserving surgery (eOBCS) describes the application of OBCS to patients who would otherwise need a mastectomy, and its safety has been previously described.ObjectiveWe aimed to compare the costs of eOBCS and mastectomy.MethodsWe reviewed our institutional database to identify breast cancer patients treated surgically from 2018 to 2023. We included patients with a large disease span (>= 5 cm) and multifocal/multicentric disease. Patients were grouped by their surgical approach, i.e. eOBCS or mastectomy. The direct costs of care were determined and compared; however, indirect costs were not included.ResultsEighty-six patients met the inclusion criteria, 10 (11.6%) of whom underwent mastectomy and 76 (88.4%) who underwent eOBCS. Six mastectomy patients (60%) had reconstruction and 6 (60%) underwent external beam radiation therapy (EBRT). Reconstructions were completed in a staged fashion, and the mean cost of the index operation (mastectomy and tissue expander) was $17,816. These patients had one to three subsequent surgeries to complete their reconstruction, at a mean cost of $45,904. The mean cost of EBRT was $5542. Thirty-four eOBCS patients (44.7%) underwent 44 margin re-excisions, including 6 (7.9%) who underwent mastectomy. Sixty (78.9%) of the eOBCS patients had EBRT. The mean cost of their index operation was $6345; the mean cost of a re-excision was $3615; the mean cost of their mastectomies with reconstruction was $49,400; and the mean cost of EBRT was $6807. The cost of care for eOBCS patients remained lower than that for mastectomy patients, i.e. $17,318 versus $57,416.ConclusioneOBCS is associated with a lower cost than mastectomy and had a low conversion rate to mastectomy.