KRAS and non-small cell lung carcinoma: In any case it should be considered that the abundance of KRAS mutations was very low, as indicated by the low MAFA values (mean 0.15%, median 0.12%, range 0.016–0.32%), compared with those found in cfDNA from NSCLC patients bearing KRAS mutant tumors (mean 8.87%, median 3%, range 0.46–53.7 %) (25).