OFP-04-009 Influence of BRAF mutations and RAC1b/RAC1 mRNA ratio or protein expression on outcome in patients with metastatic Colorectal Cancer (mCRC) treated with firstline chemotherapy M. Cuatrecasas * , V. Alonso-Espinaco, P. Jares, C. Horndler, A. Castells, J. J. Lozano, J. Maurel * Hospital Clinic, Barcelona, Spain