O-016Serial assessment of cell-free circulating tumor DNA (ctDNA) to assess treatment effect and minimal residual disease during neoadjuvant and adjuvant therapy in colorectal cancer. (2nd July 2019) - Parikh, A; Seventer, E Van; Boland, G; Hartwig, A; Jaimovich, A; Raymond, V; Talasaz, A; Corcoran, R