PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 22972628-1 2013 BACKGROUND: The authors conducted a systematic review and meta-analysis to examine whether patients who had metastatic colorectal cancer (mCRC) with the v-Ki-ras2 Kirsten rat sarcoma viral oncogene homolog (KRAS) p.G13D mutation (an amino acid substitution at position 13 in KRAS from a glycine to an aspartic acid) and received cetuximab treatment had better clinical outcomes than patients who had mCRC tumors with KRAS codon 12 mutations. Glycine 287-294 KRAS proto-oncogene, GTPase Rattus norvegicus 207-211