Circulating Tumor DNA (ctDNA) Assay
DeviceScreening investigational blood test to test for EGFR L858R and exon 19 deletions, which comprise 85-90% of total EGFR mutations. A positive or indeterminate investigational test will be followed up by CLIA verification of results. A positive or indeterminate CLIA result will be followed up by a lung CT scan. A positive CT scan will be followed up by referral for further evaluation. A negative CT scan will be followed up by a repeat scan in 12 months.