Abstract

Liquid Biopsy in Colon Cancer

Pierre Laurent, Professor, Universite Paris Descartes

RAS mutations are currently sought for in tumor samples, which takes a median of almost 3 weeks in western European countries. This creates problems in clinical situations that require urgent treatment and for inclusion in therapeutic trials that need RAS status for randomization. Analysis of circulating tumor DNA might help to shorten the time required to determine RAS mutational status prior to anti-EGFR antibody therapy for metastatic colorectal cancer. Here we compared plasma versus tissue RAS analysis in a large prospective multicenter cohort.