Advanced Oncoplastic Breast Conserving Surgery: Single Institution Experience with 823 Patients.

Oncoplastic breast conserving surgery (BCS) becomes the standard of care in multidisciplinary breast cancer treatment. From our perspective, the aim of oncoplastic BCS is the best oncological, aesthetic and functional surgical treatment results. The study's objective is to present our approaches to the selection of surgical techniques and determine operative and oncological outcomes of oncoplastic surgery. This retrospective study presents a single institution experience with patients who underwent oncoplastic BCS for breast cancer between 2007 and December 2020. Demographic and clinicopathologic characteristics as well as postoperative complications were analyzed. The analysis was performed by taking into account the types of procedures. Surgeries were categorized into two types: 1. volume displacement (level 1; advanced parenchyma displacements; therapeutic mammaplasties) and 2. volume replacement techniques (regional flaps with wide base, regional island perforant flaps). We consider as oncoplastic all the operations that are planned and performed taking into account an optimal aesthetic result regardless of the specific technique. There were 833 surgeries performed for 823 cancer patients. In 153 cases, patients had symmetrized procedures. The average weight of specimens was 112,9 g (2-1034 g); the average size of tumors was 2,8 cm (0,2-15,8 cm). 106 patients (12,7%) had multifocal/multicentric tumors. In (3,8%) 32 cases involved margins were found and re-excision was required. 793 (96,4%) patients were on follow up. The median follow-up period was 48 months (6 164 months). Local recurrence was found in 10 (1,2%) patients, regional axillary recurrence in 2 (0,3%), systemic progression in 87 (11,0%) patients and 50 (6,2%) of them have died. Complications were observed in 190 (23,1%) patients, mostly seromas and ischemic disorders. We present our approaches to oncoplastic breast conserving surgery with focusing on the aesthetic results of the procedures. Oncological outcomes demonstrate the safety of advanced oncoplastic BCS in the framework of multidisciplinary teamwork.