EP.TH.305Savi Scout Radar versus Wire-Guided Localisation in Breast Cancer Surgery: A Systematic Review and Meta-Anaylsis of Surgical Outcomes

Abstract

AimsWire-guided localisation (WGL) has been the standard technique for localisation of non-palpable breast cancers (NPBC) for almost 40 years. However, WGL has disadvantages including peri-operative scheduling challenges and patient discomfort. Savi Scout localisation (SSL) is a novel alternative that utilises an implantable wireless non-radioactive reflector. A systematic review and meta-analysis was performed to compare outcomes of SSL versus WGL in NPBC surgery.MethodsEmbase, MEDLINE, PubMed and the Cochrane Library (1946 to December 2020) were searched using PRISMA guidelines for studies comparing SSL and WGL in NPBC surgery. Outcome measures analysed were operative duration, positive margins and re-excision. Results were pooled into meta-analyses using a Mantel-Haenszel Random-Effects model as Odds Ratios for dichotomous data and Mean Difference for continuous data.ResultsFour eligible peer-reviewed cohort studies involving 808 patients were identified comparing SSL (n = 462) and WGL (n = 346). There was no significant difference between SSL and WGL in operative duration (95% CI -0.27, -7.89 to 7.34, p = 0.94), positive margins (OR 0.73, 0.36 to 1.45, p = 0.36) and re-excision (OR 0.62, 0.33 to 1.16, p = 0.13). Inclusion of two non-peer-reviewed cohort studies (additional SSL n = 143, WGL n = 424) altered statistical significance for re-excision in favour of SSL (OR 0.55, 0.36 to 0.83, p = 0.004).ConclusionsThis study demonstrates that SSL is a safe and effective alternative to WGL. SSL uncouples pre-operative localisation from surgery, reducing scheduling challenges. This is particularly useful in the current COVID-19 climate, with pre-operative patient self-isolation requirements. SSL may decrease re-excision rates. Randomised controlled trials are required to investigate this further.