Abstract #2816

MRI-Based Wait-And-See Policy in Clinical Complete Responders to Chemoradiation in Rectal Cancer: A Promising Alternative

Monique Maas¹, Doenja Lambregts¹, Ronald van Dam², Patty Nelemans³, Guido Lammering⁴, Rob Jansen⁵, Regina Beets-Tan¹, Geerard Beets²

¹Radiology, Maastricht University Medical Center, Maastricht, Limburg, Netherlands; ²Surgery, Maastricht University Medical Center, Maastricht, Limburg, Netherlands; ³Epidemiology, Maastricht University Medical Center, Maastricht, Limburg, Netherlands; ⁴Radiotherapy, Maastricht University Medical Center, Maastricht, Limburg, Netherlands; ⁵Medical Oncology, Maastricht University Medical Center, Maastricht, Limburg, Netherlands

When - after neoadjuvant chemoradiation for rectal cancer - imaging could accurately select the complete responders, surgery might safely be omitted and patients can undergo a wait-and-see policy. This study aims to evaluate whether MRI at 1.5T is accurate enough to select patients for wait-and-see and can safely be used as a follow-up tool.