P14 The use of magnetic seed for breast lesion localisation in a regional hospital: A Case Series

Abstract

Background and purpose Magnetic seeds are a new and exciting technology that is starting to be used for localisation of non-palpable breast lesions. They provide an easier pathway for the patient with insertion within four weeks of the operation and reduced risk of migration compared to wire-guided localisation (James R. Harvey, 2018). They also pose no radiation risk, and do not require a destruction protocol in comparison to radioactive seeds (Magseed, 2019). Despite magnetic seeds being proven as safe and feasible (James R. Harvey, 2018), there has been little research into their effectiveness in breast lesion localisation. Our study aimed to begin to investigate the effectiveness of magnetic seeds in breast lesion localisation. Methods Our case series was a retrospective review of twenty-five cases in one peripheral hospital to investigate the clear margin rate, tumour size to specimen weight ratio and to see if there were problems with seed migration or failure of localisation. Results We found overall 64% of cases had clear margins, with 36% requiring further surgery. The rate of surgery required for extra margins was reduced further to 17.6% after the first eight cases were excluded, suggesting a learning curve. Tumour size to specimen weight ratio was 3.07. There were no concerns with seed migration and only two cases of seed localisation failure. In the two cases where the seed localisation failed, simple measures could have mitigated against this. Conclusions This case study provides further evidence that magnetic seeds are a safe and viable alternative to radioactive seeds or wire guided localization. James R. Harvey, Y. L. (2018). Safety and feasibility of breast lesion localisation using magnetic seeds (Magseed): a multi-centre, open-label cohort study. Breast Cancer Research and Treatment, 531-536.Magseed. (2019, June 20). Endomagnetics Ltd. Retrieved from Endomag: www.endomag.com.