EP.TH.322Should a concurrent sentinel node biopsy be performed when the preoperative histopathological category of B5c in a breast cancer biopsy is identified?

Abstract Aim To assess the management of sentinel lymph node biopsy (SLNB) in patients with a pre-operative B5c histopathological diagnosis. Method A retrospective study decision for SLNB 31 breast cancer and their final histology were reviewed between 2009-2019. Factors that determine concurrent (size mass lesion > 1cm/increasing size, DCIS 4cm, recurrence abnormal nodes on ultrasound) assessed. Results 15 (48%) invasive disease 7 (23%) non-invasive had SLNB, whilst 9 (29%) did not receive no patient (0%) failed to SLNB. Using above inclusion exclusion criteria 21 (68%) would have been managed correctly 5 (16%) unnecessary surgery required second operation. Discussion In this study, 48% identified as avoided Although 23% underwent SNLB, SLNBs missed. Solely using improved results. This suggests there must be other factors involved managing these patients. Conclusion Discussions about risk benefits SLN complications vs repeat surgery, comorbidity, addition radiological characteristics, may assist decisions.