The impact of surgical technique on the number of sentinel lymph nodes removed and its effect on complication rates.

Purpose: Sentinel lymph node biopsy (SLNB) is a staging procedure used to guide treatment for patients with breast cancer. Multiple variations in the SLNB technique have been described. We questioned how technique impacts the number of sentinel lymph nodes (SLNs) removed and associated complications.

Methods: Patients with breast cancer who were treated with lumpectomy and SLNB between 2018 and 2023 were analyzed. Patients were excluded if they had prior ipsilateral breast or axillary surgery or chest wall radiation, underwent neoadjuvant chemotherapy or endocrine therapy, or subsequently required ALND. Demographics, surgical technique, and operative and pathological data were collected. Complication rates were compared between more (4+) or fewer (1-3) SLNs removed.

Results: A total of 643 patients were included, with an average of 2.44 LNs removed (range 1-11). The overall complication rate was 19.8%, with a 4.4% lymphedema rate. The lymphedema rate was higher among patients who had more nodes removed. An average of 2.5 LNs were removed with dual mapping vs. 2.0 with technetium alone (p = 0.15). Breast massage had no effect on the number of SLNs removed (p = 0.12) but did impact blue dye uptake (p = 0.001).

Conclusions: Surgical technique did not significantly impact the number of nodes removed. Removing more nodes was associated with a greater risk of lymphedema.