Predictive Response to Chemotherapy (FOLFOX or FOLFIRI) by ex Vivo Culture 3D Technique in Metastatic Colorectal Cancer

Prospective, open labelled, multicenter trial to evaluate the feasibility of ex vivo culture 3D (chemogram obtaining) on biopsies in order to estimate the predictive value of this technique for treatment response in patients treated by two different chemotherapies (FOLFOX or FOLFIRI) for colorectal cancer.