17 Peeters Peeters M M Douillard Douillard JY JY van Cutsem van Cutsem E E Siena Siena S S Zhang Zhang K K Williams Williams R R Mutant KRAS codon 12 and 13 alleles in patients with metastatic colorectal cancer: Assessment as prognostic and predictive biomarkers of response to panitumumab Mutant KRAS codon 12 and 13 alleles in patients with metastatic colorectal cancer: Assessment as prognostic and predictive biomarkers of response to panitumumab J Clin Oncol J Clin Oncol 2013 2013 20 20 31 31 759 759 765 765 10.1200/JCO.2012.45.1492 10.1200/JCO.2012.45.1492. The gene discussed is KRAS; the disease is metastatic colorectal cancer.