EGFR and lung cancer: The only two FDA-approved cfDNA-based tests with clinical utility are the cobas EGFR Mutation Test v2 (Roche Diagnostics) detecting EGFR mutations in cfDNA from patients with lung cancer [3, 18] and the Epi proColon assay (Epigenomics AG) for the detection of SEPT9 promoter methylation in cfDNA from patients undergoing screening for CRC [19].