V-Ki-ras2 Kirsten rat sarcoma viral oncogene homolog (KRAS) is mutated in 40% of CRC cases, mostly in exon 2, (codons 12 and 13) and less frequently in exon 3 (codon 61) and exon 4 (codon 146), followed by NRAS, which is present in approximately 3–5% of CRC and can be found in exon 3 (codon 61) and exon 2 (codons 12, 13) [7,8]. The gene discussed is KRAS; the disease is colorectal carcinoma.