Experiencia inicial en localización mamaria y axilar con semilla ferromagnética en la cirugía del cáncer de mama

Introduction

Currently, there are localization methods with advantages over the wires. Our objective was to analyze the accuracy and safety of the Magseed® ferromagnetic seed for the localization of non-palpable tumors and axillary lymph nodes in breast cancer patients at our center.

Methods

A retrospective observational study from March 2021 to July 2022, which included patients who underwent breast cancer surgery at our institution in whom the Sentimag-Magseed® system (Endomag Ltd.) was used for localization of non-palpable tumors and clip-marked axillary lymph nodes.

Results

Magseed® was used in 111 patients, implanted in the breast in 88 (79.3%), in the axilla in 16 (14.4%), and in both breast and axilla in 7 (6.3%). Tumors, marked lymph nodes, and seeds were successfully excised in all cases. In 2 patients (2%), tumor localization required wire (identification rate (IR): 98%). In one case, there was a failure to implant the seed in the tumor (1%). In the axilla, in 2 cases (7%) the seed was in the periganglionic fat. The lymph node IR was 100%. Ten patients (11%) had positive margins. Eight patients (8%) experienced complications unrelated to seed use. There was no operative mortality and no recurrences.

Conclusions

The use of the Magseed® seed for the localization of non-palpable tumors and axillary lymph nodes is a safe, reliable, and reproducible method. Studies are needed to assess its long-term results.