ESTRO Multidisciplinary Management of Breast Cancer 2017

Margin positivity and re excision rates

• Tumour resection volumes may be much higher with oncoplastic techniques than standard BCS

• Systematic review (Yiannakopoulou 2016) showed rates varying between 0 and 36% (this being a DCIS only series where margins are more challenging) and generally tending to be low. • This may reflect the increased volume resection making it easier to excise widely for relatively large tumours

• Rezai, in a large series of 1035 oncoplastic cases, achieved primary clear margins in 88%, which compares favourably with the UK figure of 60-80%.

• Most studies report margin re excision rates similar to those of standard BCS