KRAS and colorectal carcinoma: Among 1347 colorectal carcinoma cases with KRAS mutation data in the two United States‐wide prospective cohort studies, we detected KRAS c.34G>T (p.G12C) mutation in 43 cases (3.2%) and other KRAS mutations (i.e., KRAS mutations that were not c.34G>T) in 467 cases (35%).