I think Ashartus summed it pretty well - takes time to find out where the cancer started, how it is affecting it, different types of mechanisms they can use to destroy the cancer and not the other cells. Then finding out how to develop a drug to target such cancers - this is of course giving out grants to researchers and doctors, and the drug trials are VERY expensive. The crappy thing too is, once we figure out the specifics of a cancer another type pops up. My Uncle is a oncologist and I can ask him many other questions if you want.
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