Timeline of surgery in localized angiosarcoma of the breast: Improving outcome following multidisciplinary treatment optimization.

Introduction: Primary (PAS) and radiation-associated angiosarcomas (RAAS) of the breast are rare tumors of vascular origin with poor survival. In this retrospective cohort study, we aimed to assess the impact of multidisciplinary treatment optimization on the prognosis of patients who underwent surgery at a national referral center.

Materials And Methods: Cases of operable angiosarcoma of the breast evaluated by a multidisciplinary team including surgeons, medical oncologists and radiation oncologists expert in the field and treated from January 2012 to January 2023 were retrieved from a prospectively maintained database. The outcomes of three treatment groups, defined by the timing of surgery in relation to adjuvant and neoadjuvant therapies, were compared.

Results: Fifty-nine patients with operable angiosarcomas of the breast (49 RAAS and 10 PAS) were retrospectively identified. The five-year overall survival was 85.2 % (95 % CI 73.9-98.2) and event-free survival was significantly better in patients with grade 1 than those with grade 2 or 3 tumors. Patients receiving neoadjuvant chemotherapy had significantly better outcomes than those treated with primary surgery. Pathological complete response was significantly higher in patients receiving neoadjuvant radiotherapy after neoadjuvant chemotherapy, and a trend towards better distant-disease-free survival was found for patients with complete response at time of surgery.

Conclusions: Optimization of angiosarcoma treatment based on specialized, multidisciplinary assessment regarding the type and timing of surgery and the use of neoadjuvant chemoradiotherapy can improve outcomes. The findings of this study support the use of neoadjuvant chemotherapy as well as adjuvant and neoadjuvant radiotherapy in clinical practice.