You’re not understanding what I am saying- there is no way to identify which single cell has a mutation until it is already growing a tumor. There is no way to

You’re not understanding what I am saying- there is no way to identify which single cell has a mutation until it is already growing a tumor. There is no way to do what you are proposing -using sequencing to detect cancer mutations early before they turn into cancer- on a living person, even in principle. Single cell sequencing is for individual cells in a liquid culture- not living organisms- and the cells are destroyed to sequence them.