Testing for KRAS mutations is presently the standard of care prior to treatment with anti EGFR monoclonal antibodies such as cetuximab and panitumumab, as KRAS mutant colorectal tumors do not respond to anti EGFR monoclonal antibodies. However it is becoming clear that BRAF which is involved in intracellular signaling and cell growth and a principal downstream mediator of KRAS, when mutated resulted in shorter progression free survival and overall survival regardless of KRAS status. Targeted therapy may be taking a turn for the better making treatment more personalized.
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