KRAS and neoplasm: Total KRAS expression in the tumor samples varies between 2.0 and 5.7 fmol/3 μg (median 3.0 ± 1.4 fmol/3 μg), and between 0.4 and 1.9 fmol/3 μg (median 1.6 ± 0.6 fmol/3 μg) in the healthy control tissues.