Didn’t read the whole article but researchers will eventually identify a few characteristics or peculiarities unique only to cancer cells but not healthy ones. With that knowledge, they will come up with various methods to effectively target and kill cancer cells anywhere in the body.
That’s where the major efforts are now - identifying the commonalities within multiple (hopefully all, there is more than 200) types of cancers or mechanisms of pathological growth, to use in both the early diagnostics and treatments, and selectively targeting only tumor tissue, without harming the rest of the body and immune system.
Often it comes down to pattern matching, and it’s somewhat easier now with the advent of Big Data and networks of computers and [database] languages which can analyze vast amounts of complex unstructured/semi-structured data collection.