A Systematic Review and Meta-Analysis of Intraoperative Electron Radiation Therapy Delivered with a Dedicated Mobile Linac for Partial Breast Irradiation in Early Breast Cancer

•PBI is valid alternative to WBI in patients at low-risk of local relapse•PBI is delivered by means of various techniques, one of which is IOeRT•After IOeRT, an unexpectedly high LR rate was observed in the only phase III RCT•Patient selection impacts on LR rates after IOeRT•With appropriate patient selection IOeRT outcomes overlap with other RT techniques