The Impact of Bioabsorbable 3D Fiducial Marker on Radiation Dosimetry and Cosmesis in Early Stage Breast Cancer

In this analysis, the presence of a 3D marker significantly increases the size of a lumpectomy GTV compared to no demarcation and less than surgical clips. The lack of demarcation is worrisome for potential marginal misses - especially for partial breast irradiation. The usage of clips and/or 3D marker is strongly associated with the individual surgeon. The marker used did not influence cosmetic outcome but very few patients had less than EXC-good outcomes. A collaboration between radiation oncologists and surgeons may lead to increased usage of markers and improved lumpectomy delineation.