Abstract
Colorectal cancer is a very serious world-wide spread disease with high incidence and mortality. We try to find the predictive and prognostic factors based on the progress in molecular oncology diagnostics to pursuit the most effective therapy for patients with CRC.
RAS mutations work as negative predictors. Molecular testing of tumors for all activating mutations in KRAS and NRAS before considering anti-EGFR therapy is therefore essential in selecting the group of eligible patients for this treatment in metastatic colorectal cancer.