158PAssessment of cfDNA in patients with metastatic colorectal cancer treated with cetuximab monotherapy. (23rd October 2018) - Angus, L; van Helden, E J; van Es, S C; Boon, E; van Herpen, C M L; de Groot, D J; de Vries, E G E; Menke-van der Houven van Oordt, C W; Sleijfer, S; Verheul, H M; Jansen, M P H M