Circulating tumor DNA (ctDNA) analysis can identify cancer by sequencing for mutations and analyzing methylation patterns.

“on that uncirculine tumor DNA as it's called you can actually do more than just sequence you know for mutations to find that it's Circle and tumor DNA as opposed to normal DNA you can also look at what are called methylation patterns which is has to do with this kind of like folding and unfolding of the blueprint these molecular modifications that that that exist in certain cell types and basically if you find you know mutated sequence of DNA and it's got the methylation pattern of a colon epithelial cell guess what cancer you probably have right”