[Mutation of EGFR signaling pathway and therapy for metastatic colorectal cancer].

For the patient in whom the Kras gene variation appears, cancer cell grow and continue to multiply even if blocked by EGFR inhibitor. A topping the offered figure effect of cetuximab is not accepted. The addition of cetuximab for treatment of metastatic colorectal cancer with Kras wild-type tumors is effective.