Great news! Several variations of "liquid biopsies" are currently in late trials: others look for circulating tumour cells (CTCs) or extracellular vesicles (EVs).

The goal of all of them is to be able to determine whether a patient is truly "cancer free" (i.e. no undetectable dormant cells or microtumours that might wake up in the future).

I don't know if they'll get *all* the way there, but maybe in combination, these different types of liquid biopsy will soon give doctors enough confidence to pronounce that a patient is actually cured (rather than just "statistically cured", as is the case now).