KRAS and metastatic neoplasm: The currently approved FDA ctDNA clinical tests for metastatic disease are: ‘FoundationOne CDx’, ‘Praxis Extended RAS panel’, ‘Cobas KRAS Mutation Test’, ‘therascreen KRAS RGQ PCR Kit’, ‘Dako EGR pharmDx Kit’, and ‘therascreen BRAF V600E RGQ PCR Kit’.